Number cells/Motor Kv/Prop Size/Hull Size

[ReddyWatts]

What about a spreadsheet to help users decide on a build?


"Updated" with Lipo and esc amp ratings. There are too many variables for this to be exact for all of the different hull and motor loads. Many setups will fall outside of this general data spreadsheet. Just hope this gives you a better understanding of FE for designing successful setups.

--hull size /--------Cells---------/ ----Motor Kv----- / -------Prop Size------/---Type ESC---/-BEC-/ESC Amp Rating

17”- 24” / 2s LiPo or 6 cell NiMh / 5500 -3200Kv / 30mm - 40mm Diam. / Low Voltage / Avail. / 120 amp

20"-27" / 3s LiPo or 8 cell NiMh / 3500-2500kv / 35mm – 42mm Diam. / Low Voltage / Avail. / 120 amp

24”-29” / 4s LiPo or 12 cell NiMh /2650-1600Kv /37mm - 46mm Diam. / Low Voltage / Avail~Disc / 120-240 amp

26”-32" / 6s LiPo or 18 cell NiMh /1800-1100Kv /40mm - 52mm Diam. / Low or High / Disc. / 120-180-240 amp

30"- 36" / 8s LiPo or 24 cell NiMh / 1350-800Kv /45mm – 55mm Diam. / High Voltage / N/A / 180-240 amp

34" - 42" / 10s LiPo or 30 cell NiMh / 1100-600Kv /47mm + Diameter / High Voltage / N/A / 180-240 amp

38" - 46" / 12s LiPo or 36 cell NiMh / 900-550Kv / 50mm + Diameter / High Voltage / N/A / 240 amp

Always start testing with a small prop and work up to your desired amp readings!


HULL SIZE AND OSE MOTORS

This is a general guideline for the motors OSE sells. I know it is hard for this to cover all selections, since FE setups can be complex and extend over a wide range of extremes. Remember this is more for conservative setups to help new guys get started.

hull size…..... /…...... Neu….... /….. Feigao.540…../Feigao 580/...700SC../.SV27./.Proboat./..Ammo../.380.

<<"-20"....../.....1506........../.......Fiegao.S......./................./................./......../............../.............../.380 L

17”-24”…../….. 1506,1509./…..Feigao S-L…...../…............../................./......../............../................/........

20"-27"…../….. 1509,1512./…..Feigao L-XL...../….............../...700SC../.SV27./.Proboat./..Ammo../........

24”-29”…../…..1512,1515../…..Feigao XL…...../….............../...700SC../.SV27./.Proboat./..Ammo../.......

26”-32"…../.....1512,1515../…..Feigao XL….../….............../.,..700SC../.SV27./.ProBoat./............./........

30"-36"…../….. 1515,1521./…........…………..../….. 580L...../.............../........../.............../............./........

34"-42"…../….. 1521,1527. /…........………..…/….. 580L...../................/........./................/............./........

38"-46"…../…..1527,2215. /….. ......……..……/................../................./........./................/............./........

40"-60"..../.......2230......./Little Screamer 63mm outrunner/

MOTOR MAXIMUM WATT RATINGS.

Always look at the maximum WATTS the motor is rated to handle. The heat will kill the magnets and possibly the controller if you get it to HOT.

Continuous rating/ 30 second rating

Neu -
1506 - 700 watts/ 1500 watts
1509 - 1000 watts/ 2000 watts
1512 - 1200 watts/ 2500 watts
1515 - 1500 watts/ 2700 watts
1521 - 1700 watts/ 3000 watts
1527 - 2100 watts/ 3300 watts
2215 - 3000 watts/ 5000 watts
2230 - 6000 watts/ 10000 watts

Feigao
580L - 1800 watts/
540 XL - 800 watts/ 1600 watts
540L - 600 watts/ 1300 watts
540S - 450 watts/ 1000 watts
380L - 450 watts/ 1000 watts

SV - BlackJack 800 watts/ 1400 watts

Ammo 2300 - 700 watts/ 1400 watts

700sc - 650 watts

Volts (X) Amps = Watts

Always calculate your setup Watts and prop it to run close to your motors Max Amp rating. (maximum effeciency rating)

Example:
Specs for the motor in the BJ
TURNIGY brushless Inrunner

Power: 460W
Battery Config: 3-5S

Watts / Volts = maximum AMPS to keep motor cool - recommended by manufacturer.

460 watts / 11.1volts = 41.4 amps max

460 watts / 14.8 volts = 31 amps max

460 watts / 18.5 volts = 25 amps max

FeCalc can get you in the ballpark for loaded 2-pole motor watts and amps. It is just an estimate, but can give you a good idea of which prop to start testing with.

[ReddyWatts]

I like to try and simplify things to make brushless FE easier for the next guy.

Very few people have experience with all of the setups. Need some input.

Thanks, Reddy

[tth]

Good Job Reddy That's Going To Help A Lot Of People Simplify Things. I Know I Have Learned Much Needed Info From This Site. Granted I'm Thirty Yrs Old I Have Been Building Boats For Fifteen Yrs. A Little Over A Yr Ago
I Started To Get Serious In The Boating Community. Again Thank You To Everyone That Has Helped Me In My Builds And Answered My Posts. Keep Up The Good Work Everyone.

[G Doggett]

Great idea Reddy.:iagree:
Good basic information to use as a starting point.
What ever happened to the suggestion a while back, I think from Steven, for a spreadsheet of set ups that we are running that work ?
This sort of shared info is valuable even for old farts like me who have been building boats for years.
Graham.:rockon2:

[Eyekandyboats]

yes
36 inch hull run 4s on a 50+ mm prop

[ED66677]

Can't be more clear! Great job!
I'm personnaly just a little bit out of the table but soon will be back on proper track!!! 29" on 3S, soon 4S!
Wouldn't it be helpfull Reddy to indicate an average amp draw for each? I mean if a new guy want to go fast with a 29" mono he first need to know that this will not be possible at 30amps but pretty much at 60-80+amps... just my thought!

[ReddyWatts]

Ed, I will start looking into your idea.

Eyekandy, what is the rest of your setup?

Graham, I have been wondering the same thing about Stevens setup sheet. He has probably just been to busy.

[Eyekandyboats]

--hull size /-------------Cells---------/ -Motor Kv--- / -------Prop Size---------

17”- 27” / 2 cell LiPo or 6 cell NiMh / 600 -3200Kv / 27mm - 46mm Diameter

20"-27" / 3 cell LiPo or 8 cell NiMh / 3500-2500kv / 35mm – 46mm Diameter

24”-34” / 4 cell LiPo or 12 cell NiMh /2650-1200Kv /35mm - 55mm Diameter

26”-40" / 6 cell LiPo or 18 cell NiMh /1900-1100Kv /35mm - 52mm Diameter

26"- 40" / 8 cell LiPo or 24 cell NiMh / 1500-800Kv /37mm – 55mm Diameter

30" - 44" / 10 cell LiPo or 30 cell NiMh / 1100-600Kv /37mm + Diameter

34" - 50" / 12 cell LiPo or 36 cell NiMh / 900-450Kv /37mm + Diameter

[ReddyWatts]

Thanks for your input Eyekandy.

That must be a typo on the 600 kv and 2S or 6 cell


37mm prop on a 12 s lipo- 36 cell NiMH, 34 -50 inch hull???

[hex-dj]

Great job Reddy. Now I can have a much clear idea about the setups.

[ReddyWatts]

Thanks, that is what I was hoping to accomplish by showing a simplified "Big Picture".

[Eyekandyboats]

Thanks for your input Eyekandy.

That must be a typo on the 600 kv and 2S or 6 cell


37mm prop on a 12 s lipo- 36 cell NiMH, 34 -50 inch hull???

yeah sorry it was supposed to be 6000

and yes

[sdartt]

When you call for a 26 to 32 inch hull using 6 cell LiPo's, does that mean 2 packs with 3 LiPo's each. Thanks for the reply!:confused2:

[ghostofpf1]

Very helpful.
Something I had wished more of the vendors would do is give specific power source range recommendations for their hulls.....props..motors kv and mass...amp ranges for each set up.....
Second on the ~amp draws btw..this would be very helpful in spec'ing power components.
thanks much
Ghost

[Eyekandyboats]

also you BEC idea.. good but.. BEC should not be used on any model unless its a micro. you get better results with a BEC pack.

do you race under IMPBA or NAMBA ?

[sunsation288]

Just one word , THANKS , for share all your knowledge guy :thumbup1: , its realy appreciated....
Regards
Christian

[ReddyWatts]

Sunsation - thanks, but can't take full credit for this. Got the idea for a condensed spreadsheet while reading on another forum.

[ReddyWatts]

Sdart - You can use it either way. It is your preference, two 3S or one 6S. Whatever will work best in your hull or charger.
Eyekandy - Neither and I think that BEC is a user preference.
Ghost - I agree, but it is something they would have to keep updated since FE is a fast changing hobby. I am going to look into the amp ranges for the spreadsheet. Steven is supposed to be working on a forum spreadsheet we can enter our setups, to share with everyone.

[DISAR]

Nice work! In my opinion, these are general guidelines and one thing that is missing is estimated speed. For example for a 36" hull what is the speed with 8s, 1350 kv and 45 mm prop? Is it the same with the 800 kv and 55m prop?

Another think to mention is that I have a 36" mono running on 4s, 1700 kv, 45 mm prop, 100a ESC and runs around 35 mph.

[Steven Vaccaro]

Nice job.

[ReddyWatts]

Steven, thanks.

Disar, I will look into adding the general speeds to be expected from the different setups.

Ed, updated the spreadsheet with ESC amp ratings.

[DISAR]

Hi again,

Based on your values I prepared an Excel sheet as attached. This is for the 26-32" hulls but can be used for any of the sizes. Just insert the values in the blue boxes according to your values and it gives the required propeller according to the actual Kv and cells fitted on the boat.
This spreadsheet may be very simple and unuseful but I prepared it to see where I am standing and decided to post it.
Thanks for your valuable info.

[DISAR]

Let me correct previous spreadsheet , has one mistake in the chart view. This is the correct one.

[ReddyWatts]

Disar, can you explain more details on how to use the spreadsheat? Maybe give some examples.

[DISAR]

From the values you gave, for a specific hull size and specific lipo cells, a line is drawn (as in the chart) connecting point1* to point2**. Then somebody can insert his values( lipo cells and motor KV hence RPM) and find out what propeller diameter is needed. In other words, once the line is drawn (from your posted values) then you enter with the actual RPM and it gives you the prop.diameter (the method used is called linear interpolation in maths).

*point1: high Kv with small prop.diameter
**point 2: low Kv with large prop.diameter

For example for the 26-32" hull, you enter the following values:
In cell (a): Hull size (26-32)
In cell (b): Number of lipo cells (6)
In cell (c): High Kv (1800)
In cell (d): Low Kv (1100)
Cell (e) : Do not enter anything. Calculates RPM for the 1800 Kv
Cell (f) : Do not enter anything. Calculates RPM for the 1100 Kv
Cell (g): Small prop Diam (40)
Cell (h): Large prop Diam (52)
Cell (i): Enter Kv of your motor installed or to be bought (2900 for example)
Cell (j): Enter lipo cells that you use (3 for example)
Cell (k): Do not enter anything: Calculates actual RPM of your boat
Cell (l): Calculates propeller diam required (46mm for example)

According to the spreadsheet, I also prepared the following equations which for each boat hull size give you the propeller diameter according to your posted values:

17-27" : Prop Diam = -0.0006*RPM+53.913
20-27" : Prop Diam = -0.0006*RPM+59.5
24-29" : Prop Diam = -0.0006*RPM+59.714
26-32" : Prop Diam = -0.0008*RPM+70.857
30-36" : Prop Diam = -0.0006*RPM=69.545

The setups seem to be very high specs I would say racing giving high speeds I suppose.
I tried also with Eyekandyboats values and for my boats I got same results as my boat tests, using the 24-34" hull size with 4 cells Lipo values. The speeds for a 32" (2900 kv, 3s, 42mm) cat and 36" mono(1853kv, 4s, 45mm) are about 35-40 mph.

Thanks

[ReddyWatts]

Disar, thanks.

[ED66677]

that's really nice!
Has to be part of the holly FEB bible!

[DISAR]

A final comment is that I used the program with your posted values for the 24-29" hulls with 4s, for my boats and setups and the results are right on target.

32" cat (2900 Kv, 3s, 42 mm)
36" mono (1853 kV, 4s, 45 mm OR 1700 Kv, 4s, 45mm)

I have no experience with 6s and upwards setups and I cannot make any comments.

[DISAR]

Hi again,

Based on all the above I prepared the attached Excel file for calculating the prop diameter for each hull type and giving the setups. There are two sheets in the file one with the ReddyWatts values and one with the Eyekandyboats values.
The layout is:

17-24" Hulls, 2 cell Lipos
5500-3200 Kv
Please enter KV & number of Lipos
Motor KV 3200 ------------Here you enter the motor Kv
Lipo Cells Number 2 ------Here you enter to Lipo cells number

The required propeller diameter is
Prop Required 40 ----- Calculates prop diameter

[ReddyWatts]

Thanks again Disar

Remember, there are to many variables for this data to fit all the different hull and motor loads. Many setups will fall outside this general information spreadsheet.

This was mainly to show a structure of setups so you will see the "Big Picture" for a better understanding of FE.

Always start testing with a small prop and work up to your desired amp readings!


.

[ED66677]

when will this thread be STICKY?
I'm seing some newbies going away from this base, no good for them IMO!

[BassBoat88]

[QUOTE=ReddyWatts;44733]What about a spreadsheet to help users decide on a build?


"Updated" with Lipo and esc amp ratings. There are too many variables for this to be exact for all of the different hull and motor loads. Many setups will fall outside of this general data spreadsheet. Just hope this gives you a better understanding of FE for designing successful setups.

--hull size /--------Cells---------/ ----Motor Kv----- / -------Prop Size------/---Type ESC---/-BEC-/ESC Amp Rating

17”- 24” / 2s LiPo or 6 cell NiMh / 5500 -3200Kv / 30mm - 40mm Diam. / Low Voltage / Avail. / 120 amp

20"-27" / 3s LiPo or 8 cell NiMh / 3500-2500kv / 35mm – 42mm Diam. / Low Voltage / Avail. / 120 amp

24”-29” / 4s LiPo or 12 cell NiMh /2650-1600Kv /37mm - 46mm Diam. / Low Voltage / Avail~Disc / 120-240 amp

26”-32" / 6s LiPo or 18 cell NiMh /1800-1100Kv /40mm - 52mm Diam. / Low or High / Disc. / 120-180-240 amp

30"- 36" / 8s LiPo or 24 cell NiMh / 1350-800Kv /45mm – 55mm Diam. / High Voltage / N/A / 180-240 amp

34" - 42" / 10s LiPo or 30 cell NiMh / 1100-600Kv /47mm + Diameter / High Voltage / N/A / 180-240 amp

38" - 46" / 12s LiPo or 36 cell NiMh / 900-550Kv / 50mm + Diameter / High Voltage / N/A / 240 amp

Does this table also hold true for dual-drive setups?

[sailr]

Lots of talk about 3S lipos in here. Unfortunately, the dolts at IMPBA have deigned 3S lipos as non-existent, having 2S, 4S, etc. classes.

This is really stupid! There are so many RTR 3S lipo boats out there they are totally ignoring a segment of the market and eliminating newbies that would like to race!

[sailr]

this doesn't make any sense to me. Your spreadsheet says to use a 52mm diameter prop on a 4S 1800KV motor! NO WAY! You'll burn it up!

[sailr]

Typically 6S is 6S2P or two 6S packs in parallel. Two 3S in series will not yield enough mAh generally.


When you call for a 26 to 32 inch hull using 6 cell LiPo's, does that mean 2 packs with 3 LiPo's each. Thanks for the reply!:confused2:

[ReddyWatts]

This was an on going project. I would update the chart as users gave suggestions. I have not been able to update any of this since it was moved to this section.

[Steven Vaccaro]

This was an on going project. I would update the chart as users gave suggestions. I have not been able to update any of this since it was moved to this section.


Readdy's right. I kinda put a strange hold on him when I started this area. I hope thats somewhat resolved now.

[Doug Smock]

Lots of talk about 3S lipos in here. Unfortunately, the dolts at IMPBA have deigned 3S lipos as non-existent, having 2S, 4S, etc. classes.

This is really stupid! There are so many RTR 3S lipo boats out there they are totally ignoring a segment of the market and eliminating newbies that would like to race!


Nevermind :tape:

[ryan_t888]

There appears to be a bit of information directly taken from what I had written on rcuniverse several months ago.

Here is a direct link to the original information.
http://www.rcuniverse.com/forum/m_7603257/tm.htm

Even with the information available, I still get one pm per week asking why my power system failed resulting in burned electronics. People still are choosing motors way outside the kv range listed and props that are far too large for the application. Most are new boaters trying discover FE, not trying to make a rocket on water.

My advice is somewhere it should be stressed that if one does not know which prop or motor to select for their application PM someone who can help out.

I have designed many excel spread sheets to calculated a starting prop diameter based on weight of motor, diameter, length, boat type, and kv. It is near impossible for them to work well for every combination. My point is, experience might be the best starting point for a new boater to selecting a power system.


Does this table also hold true for dual-drive setups?

In most cases yes it would also hold true for dual drive set ups.


this doesn't make any sense to me. Your spreadsheet says to use a 52mm diameter prop on a 4S 1800KV motor! NO WAY! You'll burn it up!
Not my spread sheet but I'll still chime in since it was not answered
4s 1800kv motor is a very vague description. You are missing so many other variables. For example If you had an 1800kv S can motor it would not be too happy on a 52mm prop. If you had an 1800 kv motor in a 1521 NEU size, it would handle it with absolutely no problem and would NOT burn up.

Ryan

[ReddyWatts]

Thanks for the idea and starting point for this spreadsheet. I have tried to stress that users start with the small props and work their way up to the desired setup. FE setups are not an exact science, there are just to many variables.

[Flying Scotsman]

[QUOTE=ryan_t888;86608]There appears to be a bit of information directly taken from what I had written on rcuniverse several months ago.

Here is a direct link to the original information.
http://www.rcuniverse.com/forum/m_7603257/tm.htm

Even with the information available, I still get one pm per week asking why my power system failed resulting in burned electronics. People still are choosing motors way outside the kv range listed and props that are far too large for the application. Most are new boaters trying discover FE, not trying to make a rocket on water.

My advice is somewhere it should be stressed that if one does not know which prop or motor to select for their application PM someone who can help out.

Response

The problem is rcuniverse is not a good source of info for FE boat information and as you state and my largest concern..newbies burning up their stuff with bogus information. Tell them to join OSE or RRR forums and even then have caution to some advise espicially on RTR boats from newbies

Douggie

[Anbjorn]

This is great info. However I cant realy make my decision as my boat is slightly in the larger end of the scale.
I have a home made 67" Epoxi V hull.
I originaly designed this hull for competition in 35cc gas class.
However I have run it with a Quickdraw 25cc HT engine. It runs great with this engine. It runs 58-59mph in light chop with a stock 7018/3 prop.
Rpm is apr. 16800rpm. Weight with fuel is 11 kg or 24 pounds.
With more prop testing and tweeking I am confident I can get it past 60.
The Quickdraw is only 7,3HP and I would think this boat will be alot faster with a big brushless system.
The hull weighs about 11 pounds empty. However I will make a lighter one for electric setup if I decide to try that. To come down to 9 pounds will be doable I think.
I was thinking that a Lehner 3080/5-7 a Hydra HV240 and 4 pc. 5000mAH 22.2V Kokam lipo packs, 2 in paralell and 2 in series might do the trick. Starting prop 6717/3
Any thoughts and advices?
Yeah and I want to go fast:laugh:
Thanks
Anbjørn

[ReddyWatts]

Check this.

http://forums.offshoreelectrics.com/showthread.php?t=1577&highlight=Lehner+3080

[Anbjorn]

I am not sure I got more enlightened. This was a lot smaller boat than mine.
Good acceleration but the speed did not impress me.
Will I have problems powering my boat into realy high speeds with brushless?
Anbjørn

[ReddyWatts]

Contact this guy with a private message, has lots of experience with large hulls and setups.

http://forums.offshoreelectrics.com/member.php?u=568

[Flying Scotsman]

Another person on this site with big boat building experience and set up is...Peter Zicha
His only problem is he likes to eat :popcorn2: :smile: and not what his mamma told him to eat :cool:

Douggie

[mickvk]

--hull size /--------Cells---------/ ----Motor Kv----- / -------Prop Size------/---Type ESC---/-BEC-/ESC Amp Rating

17”- 24” / 2s LiPo or 6 cell NiMh / 5500 -3200Kv / 30mm - 40mm Diam. / Low Voltage / Avail. / 120 amp

20"-27" / 3s LiPo or 8 cell NiMh / 3500-2500kv / 35mm – 42mm Diam. / Low Voltage / Avail. / 120 amp

24”-29” / 4s LiPo or 12 cell NiMh /2650-1600Kv /37mm - 46mm Diam. / Low Voltage / Avail~Disc / 120-240 amp

26”-32" / 6s LiPo or 18 cell NiMh /1800-1100Kv /40mm - 52mm Diam. / Low or High / Disc. / 120-180-240 amp

30"- 36" / 8s LiPo or 24 cell NiMh / 1350-800Kv /45mm – 55mm Diam. / High Voltage / N/A / 180-240 amp

34" - 42" / 10s LiPo or 30 cell NiMh / 1100-600Kv /47mm + Diameter / High Voltage / N/A / 180-240 amp

38" - 46" / 12s LiPo or 36 cell NiMh / 900-550Kv / 50mm + Diameter / High Voltage / N/A / 240 amp



I'm trying to understand why the recommended RPM range is 20,000 to 40,000. Is there any explanation for what the downsides are? I expect that props that are small enough to turn at 50,000 rpms do a lot of cavitating.... Is that right? what about on the low end of the spectrum trying to drive a windmill sized prop at 10,000? Thanks.

[ryan_t888]

It's more difficult to get a large prop spinning at low RPM to go fast and handle well. My gasser turns 15000RPM. When I gun it during a straightaway it can literally jump to one side under prop torque. You can certainly run under 20 000RPM if desired.

The minimum size prop is 27mm. If you drive 50 000+ RPM, the size necessary will be too small in some cases to actually reliably make this setup work. Also the thrust will not be great enough to push the hull on plane. There must be a good balance between pitch speed and thrust to efficiently drive the boat ahead.

Ryan

[ED66677]

as Ryan wrote if you run below 20000rpm (I would even say 25000), the appropriate prop that will make your boat go fast will be so big that the prop torque will be a serious problem, if you run above 35-40000rpm the prop will be so small that it will gave a poor efficiency (prop slippage) can you imagine a 40" boat with a 37mm? chances are that the hull won't move at all!
That said, running efficiently above 40-50000rpm is possible, it requires oversized components and short run time (SAW).

[mickvk]

Got it. Thanks guys, that's very helpful.

[exotica]

...great thread.

[KillerDave]

What about a spreadsheet to help users decide on a build?


"Updated" with Lipo and esc amp ratings. There are too many variables for this to be exact for all of the different hull and motor loads. Many setups will fall outside of this general data spreadsheet. Just hope this gives you a better understanding of FE for designing successful setups.

--hull size /--------Cells---------/ ----Motor Kv----- / -------Prop Size------/---Type ESC---/-BEC-/ESC Amp Rating

17”- 24” / 2s LiPo or 6 cell NiMh / 5500 -3200Kv / 30mm - 40mm Diam. / Low Voltage / Avail. / 120 amp

20"-27" / 3s LiPo or 8 cell NiMh / 3500-2500kv / 35mm – 42mm Diam. / Low Voltage / Avail. / 120 amp

24”-29” / 4s LiPo or 12 cell NiMh /2650-1600Kv /37mm - 46mm Diam. / Low Voltage / Avail~Disc / 120-240 amp

26”-32" / 6s LiPo or 18 cell NiMh /1800-1100Kv /40mm - 52mm Diam. / Low or High / Disc. / 120-180-240 amp

30"- 36" / 8s LiPo or 24 cell NiMh / 1350-800Kv /45mm – 55mm Diam. / High Voltage / N/A / 180-240 amp

34" - 42" / 10s LiPo or 30 cell NiMh / 1100-600Kv /47mm + Diameter / High Voltage / N/A / 180-240 amp

38" - 46" / 12s LiPo or 36 cell NiMh / 900-550Kv / 50mm + Diameter / High Voltage / N/A / 240 amp

Always start testing with a small prop and work up to your desired amp readings!


HULL SIZE AND OSE MOTORS

This is a general guideline for the motors OSE sells. I know it is hard for this to cover all selections, since FE setups can be complex and extend over a wide range of extremes. Remember this is more for conservative setups to help new guys get started.

hull size…..... /…...... Neu….... /….. Feigao.540…../…..KB45...../...700SC../.SV27./.Proboat./..Ammo../.380.

<<"-20"....../.....1506........../.......Fiegao.S......./................./................./......../............../.............../.380 L

17”-24”…../….. 1506,1509./…..Feigao S-L…...../…............../................./......../............../................/........

20"-27"…../….. 1509,1512./…..Feigao L-XL...../….............../...700SC../.SV27./.Proboat./..Ammo../........

24”-29”…../…..1512,1515../…..Feigao XL…...../….............../...700SC../.SV27./.Proboat./..Ammo../.......

26”-32"…../.....1512,1515../…..Feigao XL….../…..KB45...../.,..700SC../.SV27./.ProBoat./............./........

30"-36"…../….. 1515,1521./…........…………..../….. KB45...../.............../........../.............../............./........

34"-42"…../….. 1521,1527. /…........………..…/….. KB45...../................/........./................/............./........

38"-46"…../…..1527,2215. /….. ......……..……/….............../................./........./................/............./........

MOTOR MAXIMUM WATT RATINGS.

Always look at the maximum WATTS the motor is rated to handle. The heat will kill the magnets and possibly the controller if you get it to HOT.

Continuous rating/ 30 second rating

Neu -
1506 - 700 watts/ 1500 watts
1509 - 1000 watts/ 2000 watts
1512 - 1200 watts/ 2500 watts
1515 - 1500 watts/ 2700 watts
1521 - 1700 watts/ 3000 watts
1527 - 2100 watts/ 3300 watts
2215 - 3000 watts/ 5000 watts
2230 - 6000 watts/ 10000 watts

KB45 - 1500 watts/ 2700 watts

Feigao
XL - 800 watts/ 1600 watts
L - 600 watts/ 1300 watts
S - 450 watts/ 1000 watts
380L - 450 watts/ 1000 watts

SV - BlackJack 800 watts/ 1600 watts

Ammo 2300 - 700 watts/ 1400 watts

700sc - 650 watts

Volts (X) Amps = Watts

Always calculate your setup Watts and prop it to run close to your motors Max Amp rating. (maximum effeciency rating)

FeCalc can get you in the ballpark for loaded 2-pole motor watts and amps. It is just an estimate, but can give you a good idea of which prop to start testing with.

Hi there,

I think you replied to my thread about my on board Li-Po fire???
As you might know, I am new to FE and there are a few things I don't understand...

In the motor KV ratings, The speeds go from high to low i.e. 1800 - 1100 Kv???
Also, Can you explain your comment about running the motor as close to its max amps???

Thanks....

[ED66677]

Link the KV to the hull size i.e for a 2S setup, 17"-24" and 5500KV-3200KV, you would use a 5500KV motor for a 17" hull and a 3200KV motor for a 24" hull, this can be explain by the fact that under 2S a 5500Kv motor will spin a smaller prop than a 3200KV motor, too small of a prop (too small compared to the hull size) would slip a lot, i.e a 29mm prop on a 40" hull will do nothing at all.
Motor manufacturers have datasheet, i.e Feigao tells that a 540-08XL is rated for 83A you then want to use it around this value, you need a recorder to do so, (EagleTree Micro Logger)

[KillerDave]

Link the KV to the hull size i.e for a 2S setup, 17"-24" and 5500KV-3200KV, you would use a 5500KV motor for a 17" hull and a 3200KV motor for a 24" hull, this can be explain by the fact that under 2S a 5500Kv motor will spin a smaller prop than a 3200KV motor, too small of a prop (too small compared to the hull size) would slip a lot, i.e a 29mm prop on a 40" hull will do nothing at all.
Motor manufacturers have datasheet, i.e Feigao tells that a 540-08XL is rated for 83A you then want to use it around this value, you need a recorder to do so, (EagleTree Micro Logger)

Got it! Thanks buddy! :-)

[bigwaveohs]

Let me correct previous spreadsheet , has one mistake in the chart view. This is the correct one.

What are "For Chart Purposes" numbers?

[agressive1]

Hey

Im after some help on what size Motor and what ESC i would need for my type of hull.

The hull iam using is a 37.5" Mono Hull which is 11" wide, Iam wanting it to be brushless and iam wanting to at least get about 10 minutes out of a battery. I do want this boat to be quick also and specially do want it to run for that 10 Minutes.

So what Brushless motor will i need, Feigao preferably?
What ESC will i need, dont want something to extreme and expensive?
What lipos, size, Volts etc, should i run 2x Lipos in parallel?
What size prop do i need?

[RayR]

Hey

Im after some help on what size Motor and what ESC i would need for my type of hull.

The hull iam using is a 37.5" Mono Hull which is 11" wide, Iam wanting it to be brushless and iam wanting to at least get about 10 minutes out of a battery. I do want this boat to be quick also and specially do want it to run for that 10 Minutes.

So what Brushless motor will i need, Feigao preferably?
What ESC will i need, dont want something to extreme and expensive?
What lipos, size, Volts etc, should i run 2x Lipos in parallel?
What size prop do i need?

A 580 12L, Turnigy 180 esc, 2 x 6S 5000Mah packs and a X450 should get you where you want to go, without breaking the bank (completely).

All the best,
Ray

[agressive1]

The 580 12L

Whats that equivalent to the Feigao?

[RayR]

That is a Feigao. You are not gonna push that boat with the 540XL series with damaging the motor.

[agressive1]

Ok now i see

How would this ESC go with it, Its the last one for $159.95

http://www.rcboatbitz.com.au/

Also what brand LIPOS should i go for and how many Volts should they be?

[RayR]

That is the speedo I referenced. these lipo's should do fine:

http://www.hobbyking.com/hobbycity/store/uh_viewItem.asp?idProduct=10308&Product_Name=Turnigy_5000mAh_6S_40C_Lipo_Pack

You need 2 (two) of them.

All the best,

Ray

[agressive1]

Ok how come they are named different, kinda weird, would they be copys.

Sorry kinda new to all this

[RayR]

the Turnigy speedo is made by Hobbywing, just rebadged. They are identical.

[agressive1]

Ok

Would you know how long my runtimes would be and what speeds i should be getting?

[RayR]

Mid to upper 40's and right on the edge of your 10 minute requirement.

You may want to consider the 6500 Mah cells from Hyperion to maximize the runtime, but they are significantly more expensive.

[m4a1usr]

I personaly dont think your going to get a reliable 10 min run time out of a Feigao motor in anything but a very, very mild setup. Most Chinese motors only have an eff. rating in the low 80's if that in all honesty. So if you are running a 22.2 volt system and plan on no more then 80 amps continous or average, doesnt matter for the most part, that means you are going to be generating 1776 watts. 80% of that is 222 watts. Thats what the motor is going to need to disipate. They dont have openings in the ends to remove the heat surrounding the rotor. A water cooling shell will do some work but not the bulk of it. I bet the motor doesnt last as long you may expect it to. Just my opinion, my 2 cents.

John

[agressive1]

Thanks John and Ray

I have been told this setup by another person.

To run any 5000mah 14.4v LIPO batterys in parallel x2
Feigao 2073kv 8xl
The same ESC as Turnigy just a rebadged one
42mm propeller

What do you think of that?

What

[m4a1usr]

Thanks John and Ray

I have been told this setup by another person.

To run any 5000mah 14.4v LIPO batterys in parallel x2
Feigao 2073kv 8xl
The same ESC as Turnigy just a rebadged one
42mm propeller

What do you think of that?

What

Not going to be anything fast on a 540 8XL can. Just not enough power to push a 37" hull the speeds you want. If you want to go with a chi motor at least use something along the lines of what Ray recommended. The 580L or maybe a Keda45 but again if you want some decent speed, in the 40's, and want a 10 min run time you should look at the larger outrunners available. The Little Screamer, or a Scorpian, motors like those. Lots of power to push that hull around all day long. As far as a speedo have you looked at the himodel gx200? You can find them for about $60. A large outrunner will be about $160 or less. Those 2 will get that hull up on plane. And you can move up to a realistic prop. Probably something in the 50 to 55mm range. OSE has just become a dealer for Scorpian so ask Steve what an HK4025-1100kv will cost you. Thats 2200 watts on 6S at 24k rpm.

John

[agressive1]

John with that setup your telling me im guessing it will be quicker then the above 580xl setup i was told, but how will the batterys last?

Ill look further into this as well and see whats easily available for me down in Australia.

[m4a1usr]

John with that setup your telling me im guessing it will be quicker then the above 580xl setup i was told, but how will the batterys last?

Ill look further into this as well and see whats easily available for me down in Australia.


I dont think it will necessarily be any quicker with a 580 size can if you prop them the same and the kv is similar, but the outrunner will remain cooler without a doubt. And with a larger rotor you should have a greater selection of props to choose from when perfecting your setup.

John

[RayR]

....

[agressive1]

Ok

So im going to go for a 580 sized motor and the ESC as recommended above.

[agressive1]

Ok, So my final setup will be something like this

Feigao 580 12L
Turnigy 180A ESC
Turnigy 22.2v 6S 5000mah LIPO X2 in Parallel
X450 Prop or something bit bigger

How does this sound?

Also what type of servo is recommended, metal geared or plastic?

[Mel279]

Ok, So my final setup will be something like this

Feigao 580 12L
Turnigy 180A ESC
Turnigy 22.2v 6S 5000mah LIPO X2 in Parallel
X450 Prop or something bit bigger

How does this sound?

Also what type of servo is recommended, metal geared or plastic?

Thats a fine setup, try it first with that prop, if it run slow then u can change to a bigger prop, but remember to check the temp after u run it for a minute. Go for a high torque metal gear servo.

[Mel279]

Ok, So my final setup will be something like this

Feigao 580 12L
Turnigy 180A ESC
Turnigy 22.2v 6S 5000mah LIPO X2 in Parallel
X450 Prop or something bit bigger

How does this sound?

Also what type of servo is recommended, metal geared or plastic?

Thats a fine setup, try it first with that prop, if it run slow then u can change to a bigger prop, but remember to check the temp after u run it for a minute. Go for a high torque metal gear servo.

[agressive1]

What should the temps be when i run it for a minute and what should the overall temperature be when i have ran it for the full battery?

Or is there a temperature range it should be in between, degrees preferable thanks.

[agressive1]

Anyone know what the temps should be at with my above setup?

[ryan_t888]

No more than 140F in my books. This applies for battery/esc/motor. Cooler the better

Ryan

[agressive1]

ok sweet

[agressive1]

Is it better if i have 2 water pick ups, one for the motor and one for the ESC.

Or should i have just one first going to the ESC then motor?

[ryan_t888]

Have one fast flowing line. The only reason for 2 is if 1 is not sufficient enough.

Ryan

[agressive1]

Ok i think i will have 2x pick up lines or ill have a Y piece on the pickup to create two.

[ryan_t888]

Or you will just go through the esc and then through the motor

Ryan

[agressive1]

Ok i have bought all my hardware and hull and also Lipo batterys, i had gotten the FlightMax ones supposebly they are slightly better, who knows.

Now i need my ESC and Motor, i thought i will order it from this sites store although was wanting to know if this sites shopping store does warranty on items as i here that the Feigao 580 motors burn out fairly quickly.

Or is this an older myth?

[ReddyWatts]

I think the Feigao 580 motors are good quality for the money.
You will not find any FE site that handles warranty claims better than OSE!

[Steven Vaccaro]

Ok i have bought all my hardware and hull and also Lipo batterys, i had gotten the FlightMax ones supposebly they are slightly better, who knows.

Now i need my ESC and Motor, i thought i will order it from this sites store although was wanting to know if this sites shopping store does warranty on items as i here that the Feigao 580 motors burn out fairly quickly.

Or is this an older myth?

The 580 motors are a good motor for the money and put out a good amount of power. But there is a limit to what they will put out. For instance in a recent post talking about a blown 580 motor, It turns out that he was racing against boats with 1527 neu motors. I can say that they will NOT compete with a Neu 1527 motor. Its just out of its league. They are more in line with a 1515 or 1521 in terms of output watts.

[agressive1]

Hey Steven

What NEU motor is suggested for my boat then, its a 37.5" Mono Hull, i will be running a Seaking 180A esc and 2x 22.2v Lipo 5000mah 6s lipos in Parallel.

You told me the Neu 1521 in a email but what KV rating do i go for or should i go for a 1527 and what KV do i go for.

Also what speeds will i be looking at and what run time?

[agressive1]

Anyone know what Neu motor?

[ryan_t888]

1521 1Y
1527 1.5D

Ryan

[agressive1]

Hey Ryan

What does the 1y mean and the 1.5D mean. Im guessing the 1527 is faster then the 1521

Is the Feigao 580 8l much faster then the 12l? or do i need the 12l for the size of my boat 37.5"?

[ryan_t888]

1Y = 1 turn of windings terminated with Wye wiring pattern
1.5D = 1.5 Turns terminated with a Delta wiring pattern

8L vs 12L is only a difference of number of turns for the motor. Both motors will handle the same amount of output watts. Thus both are equally as powerful. Select the best winding based on the amount of voltage you plan to use.

The 1527 is more powerful than the 1521 as it is a larger motor can. It will dissipate more waste energy and output more mechanical energy when setup correctly.

Ryan

[agressive1]

Thanks Ryan thats really appreciated.

I think i will stick with a Feigao, for my hull setup do you think i should still go for the 12l or move up to a 8l?

Thanks
Dean

[ryan_t888]

I would use a 580 9L 1426kv. Excellent for a 6s mono.

Ryan

[agressive1]

Are the ETTI ESC better then the Seaking ESC's.?

I was going to get the Seaking 180a ESC but iam now looking at the ETTI Race 150 Brushless ESC.

Will this handle the Feigao 580 9l brushless motor and 2x 22.2v 6s lipos in parallel or am i better of with getting the Seaking???

Thanks
Dean

[agressive1]

Well i have gone back to the Neu motors

I think i will go for a 1527 1Y or a 1527 1.5D, what do you think for my setup?

[agressive1]

The setup iam wanting to run is apparently to heavy for the motor choices above, a 1527 is to large and so maybe is a 1521.

Apparently i will kill my seaking 180a esc and my batterys are not good enough for the job.

I have been told to get a 1415 or something along these lines?

[ryan_t888]

What hull is this for, I can't remember>

Ryan

[agressive1]

I will tell you my set up and what i have got.

Hull: SpeedMaster 45, 37.5" Long
Hardware: Speedmaster Hardware
Motor Mount: Peter Zichas, 5" wide for a 1521 to 1527 sized motor.
Speedy: Seaking v2 180A
Prop: Octura X646 "Can be changed"
Lipos: FlightMax 5000Mah 22.2v at 6s x2 in Parallel
Connections and Wires: 10 Gauge Wire, with 5.5mm and some 6.0mm Plugs

Now i have been told that my hull is to heavy to run a 1521 or a 1527 as they will push out to much amperage and will not be sufficient leading them to kill my Speed controller etc.

The motors that i will be buying are from Fast Electrics in Australia, they are specially made for Andrew who is the owner of Fast Electrics and are known as a full racing competition motor which is built by Neu, Andrew believes that i can not run the motor in my boat due to my setup as my hull is to heavy and my lipo packs can not keep up with the motor neither can the Speed controller.

Andrew is trying to sell me a 1415 or something but my engine mount will not fit it, i believe that motor is to small my self.

He tells me if i get a Standard 1521 or 1527 it will be more sufficient for my hull setup. But i can not find anyone who sells them.

Please what are your thoughts?

[ryan_t888]

I would definitely not go any smaller than a 1521 for power. A 1527 would be ideal.

I would run 6s minimum and 8s for sport use.

Ryan

[agressive1]

Ryan thats what im not understanding, why would he want to sell me a smaller motor if i got a heavy hull.

Do you still think the 1527 1Y is idea or the 1.5D?

Although his Neu motors are slightly different to the standard ones that OSE sell, im guessing it wouldnt make much of a difference will it?

[ryan_t888]

How are they different? Are they the older style. Kv is slightly different if so.

Ryan

[agressive1]

Apparently they run harder then the standard Neu motors, he cant tell me specs of them as they are specially made for him and for buyers to buy of him.

[ryan_t888]

Order from OSE?

Ryan

[sakawinkee]

I would definitely not go any smaller than a 1521 for power. A 1527 would be ideal.

I would run 6s minimum and 8s for sport use.

Ryan

http://www.youtube.com/watch?v=Ij4elsqmjjg&playnext_from=TL&videos=qv8z2SRnYBU

[agressive1]

Thats preety slow for my liking hopefully with a 1527 1Y it will go harder.

I would love to order from OSE but they dont have any in stock, i would like one as soon as possible.

Iam going down to the boat club on sunday as they are having the fastest straight line runs and as far as i know theres a few Brushless people down tehre so will have a chat to them and see if they have any motors to sell me and or if they have a good supplier.

If not OSE its going to have to be.