32" Mono Build

[Remmie81]

I was looking for a electric playboat next to my gasboats and found this 32" Mono that is solled all over the world under a different name

Here is the setup im going for:
Leopard 4074 -2150Kv
Turnigy 180Amp Esc
Turnigy 5S 5000Mah 30-40C Lipo
Prop: any recommendations welcome

First started out with making the Lipo tray:

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120407_170210.jpg?m=1334136689

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120407_170625.jpg?m=1334136691

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120409_104206.jpg?m=1334136736

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120409_104709.jpg?m=1334136754

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120409_104858.jpg?m=1334136787

DONE!
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120409_105101.jpg?m=1334136751

[Remmie81]

Then its time for making the motor mount (this is not the finished motor mount yet):

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120410_192501.jpg?m=1334136800

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120410_192527.jpg?m=1334136817

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120410_193431.jpg?m=1334136819

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120410_203149.jpg?m=1334137189

[Remmie81]

Then the boat itself finally arrived :lol:
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_153955.jpg?m=1335549984

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_160355.jpg?m=1335550021

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_160325.jpg?m=1335550010

[Remmie81]

There was a little bit to much flex in the bottom, so took care of that with a layer of Carbon/Kevlar
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_170859.jpg?m=1335550402

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_184510.jpg?m=1335551183

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_191012.jpg?m=1335551223

[Remmie81]

Goodies!!

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_163251.jpg?m=1335550305

Rudderblade a little bit to long, so this will be shortened
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_164237.jpg?m=1335550307

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_163323.jpg?m=1335550351

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_163208.jpg?m=1335550344

[Remmie81]

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120427_215243.jpg?m=1335867189

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120428_182801.jpg?m=1335867222

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120428_182909.jpg?m=1335867492

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120428_191336.jpg?m=1335867196

Now I have to go back into my hobby room to continue building and making pictures :biggrin:

[ozzie-crawl]

The carbon kevlar looks sweet. They run well those monos.
Before anyone else asks. Were did you get that stinger,looks different.

[Remmie81]

Thanks!

I got it from here: http://www.horracing.com/product_info.php?products_id=472&osCsid=p66qlvuc0h5864e34jkjobqnf4
Its a nice thing as you can adjust the length of the drive by just screw it in or out.

[Remmie81]

Ok, ive done a little bit more:

Lined up engine and brass tube
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120501_180359.jpg?m=1335895420

Get everything in place at desired CG and mark it with some painters tape
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120501_180354.jpg?m=1335895477

Equipment out of the boat and sand the places were the glue needs to come
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120501_191515.jpg?m=1335895420

Done!
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120501_193350.jpg?m=1335895723

Use a Lipo and old big Brushed engine as weight for lipo tray :biggrin:
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120501_193902.jpg?m=1335895476

Now have to wait untill the Polypox700 (2comp glue) has done his work (Should take approx 24 hours) before I can continue

[mtbenjamin77]

Very nice build my friend. I'm looking to build almost the exact setup. Same stinger, but different longer trim tabs, but I'm not sure I can get them to fit right. I was thinking maybe using mounting the rudder on the left side so I can turn the bracket to the outside of the boat so I have room for the taller trim tabs. Also, I was planning on using the leo 4082 1800 on 5S I wasn't sure if the 2000 would handle 5S, any thoughts?

[Remmie81]

mtbenjamin,

I dont think it need bigger taps. do you have them already, otherwise you can maybe swap them for smaller ones?
I would not put the rudder on the left myself.
Your motor and lipo setup should be good!

[mtbenjamin77]

I guess I wouldn't have to mount it on the left side I would just have to turn the bracket around so that the screws are closer to the side. Thanks for the helps remmie. I'll post some pics once I make some progress. I'm still waiting for parts. Thanks again my friend.

Travis

[steveo]

man that is not alot of glue around that motor mount, i did something similar to that and motor came unglued might want to considered a little more reinforcement especially during a high speed crash

[mtbenjamin77]

man that is not alot of glue around that motor mount, i did something similar to that and motor came unglued might want to considered a little more reinforcement especially during a high speed crash

Yeah I usually add a small piece of cloth on both sides of each support. I learned that the hardway.

[Remmie81]

@Travis,
Your welcome

@Steve
Thanks for your feedback. :thumbup1:
Normally I first "tack-down" the motormounts with 5min epoxy and then fix them with 24 hours epoxy.
This time I wanted to go stronger because of the reason you just gave (high speed crash) so directly started with the 2comp glue as far as I could reach.
Tomorrow when the glue is hard, i can take out the motor and reinforce the innersides.

EDIT: normally I do use cloth for reinforcement but this Polypox glue is extreme strong stuff. In my gas-engines boats the engine rails dont come loose with only use of this glue.

[mtbenjamin77]

Remmie,

Any progress my friend?

[steveo]

@Travis,
Your welcome

@Steve
Thanks for your feedback. :thumbup1:
Normally I first "tack-down" the motormounts with 5min epoxy and then fix them with 24 hours epoxy.
This time I wanted to go stronger because of the reason you just gave (high speed crash) so directly started with the 2comp glue as far as I could reach.
Tomorrow when the glue is hard, i can take out the motor and reinforce the innersides.

EDIT: normally I do use cloth for reinforcement but this Polypox glue is extreme strong stuff. In my gas-engines boats the engine rails dont come loose with only use of this glue.
cool just lookin out, i had the same boat i did like u and and built the boat how i wanted it i, i did order it with 4" rails for added strength and ran 4s2p with the batts between the rails. also i first used a strut but then got a stinger which helped the boat with the added length if i were to do another one i would get a long srtut bracket to be a long as the stinger and have a bit more prop depth adjustability - great looking carbon work btw should be a fast boat

[steveo]

be carful with setup u have heat wise thats a pretty high kv for 5s i had a 2000kv 3680 motor and ran on 5s with identical battery one time and battery was swollen and all electronics were way above normal 4s opreation temps had a x442 i think but hey maybe i had to big of prop, so i suggest u start small x440

[mtbenjamin77]

cool just lookin out, i had the same boat i did like u and and built the boat how i wanted it i, i did order it with 4" rails for added strength and ran 4s2p with the batts between the rails. also i first used a strut but then got a stinger which helped the boat with the added length if i were to do another one i would get a long srtut bracket to be a long as the stinger and have a bit more prop depth adjustability - great looking carbon work btw should be a fast boat

Yeah, nice carbon work. you have any tips or tricks to share on how to get such a nice finish on the carbon?

[Remmie81]

Hi Guys,

Sorry for not updating so frequently but was a little bit busy.

I have her ready!! Incl nice decal :laugh:
When she drives ok, I will paint the boat.

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120517_125158.jpg?m=1337286091
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/20120517_131239.jpg?m=1337286092

[Remmie81]

Yeah, nice carbon work. you have any tips or tricks to share on how to get such a nice finish on the carbon?

You want to know only how to finish the carbon like that? As a finish I directly go over it with a brush (that I use for putting the carbon in) with a small amount of epoxy.
Just a tiny bit is enough.

[Remmie81]

Did a testrun :hide:

Started with a carbon 42mm prop, trimtabs way up, drive neutral but that was not like it should run.
Getting boat in again, adjusted trimtabs to neutral position. That was much better.
Still need to set it up better, but for the first run its pretty ok.

ESC: Cold
Engine: Cold
Lipo: Normal temp
Power: Enough :rockon2:



https://vimeo.com/42362943

[martin]

With the 180a esc do you use the lvc or do you find you have to use no lvc to stop it cutting in to soon. Thanks Martin.

[Remmie81]

Hi Martin,

Ive put the 180esc on no cut-off.
As soon as i hear the revs going down I stop driving it.
Run 2 lipos like that yesterday and both had 3.2 volt per cell.
So more then safe.

Cheers,
Remmie

[Make-a-Wake]

Why did you go with a 5 cell Lipo? That motor with a 42mm prop is basically a 4s setup........................

[Remmie81]

@make a wake
Just for fun to see how it would run and because it can.
I will probably drive it in the future on 4s parallel and for speed run on 5s
I was curious what it would do (also regarding temps)
With this setup its way to light. Only 3070gramms.

Grtz, Remmie

[Make-a-Wake]

I have a Pursuit which is basically the same hull, ran it with a 4074 2150kv on 4s for a year, spinnin an x442 it would top out at 47 mph or so, I threw 5s in it once with an x 440 to see what it would do and it got to 59 mph.

Nice build you have there, very clean and well thought out. Get some vid for us!!:thumbup1:

[Remmie81]

Thanks man!

I will test with some other props. First need to do some fine tuning as its running stable enough as I want.

I will shoot some vids of the next runs!!

Grtz, Remmie

[ron1950]

looks every bit of a pursuit hull...i run mine with two 4s in parrell and a m445 prop no heat probs at all.....took a stright edge and ran the trim tabs down till they just touched the stright edge ..that took all the bad habits out of it......

[Remmie81]

Thanks Ron

Yes i think its a copy of the pursuit.
Im now 1mm above the edge of bottom with my tabs.
Will see how that goes. If that doesnt work i will drop them little bit further.

I have seen the m445 being mentioned very often here.
Does someone have a link were to buy this?

Thanks!

[Make-a-Wake]

Remmie, my Pursuit now has a 4082 2200kv and I'm spinning a..........................yep, you guessed it, m445! You are probably aware that the M series are the X series with the tongues removed. It allows the motor to rev out more.

http://www.offshoreelectrics.com/proddetail.php?prod=oct-m545

[Remmie81]

thanks Guys!

Did a run yesterday (again with the carbon 42mm prop) .
Trimtabs were 1mm above bottom and it was doing already much better.
First run: stopped when I heard the revs going down: Lipo cells at 3.4 Volt, motor and ESC colt, battery warm
2nd Run: Stopped when I heard the revs going down: Lipo cells at 3,5 Volt, motor and ESC colt, battery hot

Driving time 4:00 min before revs dropping.

For the setup I have now, should I prop smaller? Like a 40mm prop?

It was a pretty small water, so had to go off the throttle and accelerate very often, could not make use of the full width of the channel
as there was a lot of debri in the water.
Here a short vid of the 1st run:


http://www.youtube.com/v/k7gTQqLel-k

[Bullwink]

Nice Build. I haver the same boat (Pursuit) Actually, the one Steveo built. After reading this post, I bought the adjustable stinger you have. So, now I have a couple of questions about it. What total length do you think is best and then, how do you secure it so it does not screw in or out?

[mtbenjamin77]

Nice Build. I haver the same boat (Pursuit) Actually, the one Steveo built. After reading this post, I bought the adjustable stinger you have. So, now I have a couple of questions about it. What total length do you think is best and then, how do you secure it so it does not screw in or out?

I have the same boat and stinger. You tighten the screw holding the angle adjuster that clamps around the stinger

[Bullwink]

Thanks! I just hadn't tightened it enough.

[srislash]

Hi Remmie,I just got my same hull as well.Just curious where you found that rudder?I have the same one on my cat but with a short standoff.Having interchangeable parts would be sweet.

Shawn

[siberianhusky]

You should be stopping when the voltage is about 3.7 resting voltage, you're taking the packs below 20% by going that low. One of the things I don't like about some esc's, too low a cut off voltage.
Timing your runs is the safest method, try about 3:30 and see how they do. It may not be your setup it may just that the batts are being discharged a bit too much.
One of the best buys I've made for electric boats is an EagleTree data logger, so nice being able to see exactly what is going on through the entire run. Sometimes it's a real eye opener.

[Remmie81]

Shwan, i got it from horracing.

@Syberianhusky
Ok you say 3.4volt rest is to low. Can you explain how you calculate the 20%
I dont understand how you get to the 3,7volt value.

Thanks!!!

[siberianhusky]

http://i703.photobucket.com/albums/ww39/filmmaker2009/Fuel.gif
This is from another thread last week about batteries.
Basically when you run a 5000mah pack down to 3.7 volts it takes about 4000mah to charge it again. That means you've used about 80% of the packs capacity during the run.
Your charger should be able to tell you how much went into the battery when the charge is done, you already know the capacity of the pack, the rest is simple math.
Hope this helps

[Remmie81]

Ah got it! Thanks! I was trying to figure out the 20% on the voltage.
Did 2 runs yesterday, stopped little bit earlier then last time.
Voltage was 3,7volt per cell on both packs.

Packs were warm but not hot. Temp outside was 30c so im happy with the result.

Put my gps in it: 53,5mph with the carbon 42mm

[Make-a-Wake]

Personally I consider 3.7v resting to be 100% depleted..................may not quite be but its darn close.

[Remmie81]

First lipo is on charger now. Will see how much amps it will load and that should give me
An indication of how far i pulled it empty with a rest voltage of
3,7 volt :-)

Thanks for all the information guys!!

[siberianhusky]

If 3.7 is empty why to I put 80% back into the pack?
But that is as low as I will run them, so you could in an offhand way claim that 20% remaining is depleted.
No point in confusing people with technically incorrect info.

[Remmie81]

So, both packs are charged. And like Siberianhusky said: at 3,7volt the pack is 80% discharged.
I run 5000mah packs and they both charged 4000mah.

Thanks again for the explanation!!!

[Remmie81]

I wanted to have the gap closed between transom and drive, so gave my buddy some measurements and he took that to his work and came back with this nice spacer.

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/IMG-20120607-WA0014.jpg?m=1339396953
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/IMG-20120608-WA0001.jpg?m=1339396954
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/IMG-20120610-WA0003.jpg?m=1339396956




After that I did my first run ever with this boat with a metal prop. Tried a X440/3
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/93km.jpg?m=1339397008

[martin]

Remmie a lot do this mod on the spacer using a piece of 6mm bore silicon exhaust tube squeezed between so that you can move the stinger to positive or negative whilst still maintaining a seal. Martin.

[martin]

Remmie what settings did you use on the 180a esc ecspecially the lvc, have you had the lvc cut in to soon as this is a common problem with those esc. Thanks Martin.

[Remmie81]

Hi Martin,

Well It looks like i found the sweetspot regarding angle of the stinger, and with this spacer im good.
Good idea of the 6mm silicon exhaust tube. I will look if I still have some laying around and try that as well! Thanks mate!

Programming of the 180ESC
No Brake
Hard set to 5 Cell Lipo
LVC = off
Timing was set on lowest, but changed that now to 7,5 but I think I go back to lowest. Cant remember what it was. 1 or 3,5.
Compared with the carbon prop i lost 3km/h when I raised the timing. Will do a test again this week to see what happens

As soon as I hear the revs drop a little bit I stop driving and end up with 3,7Volt per cell. Recharging the 5000Mah packs take then 4000Mah.
Run time is then just below 4 minutes full speed passes back and forth. Water is to small so I have to make small turns everytime.

With my run of yesterday the temps were pretty good:
Engine: 37 C
ESC: 45 C
Lipo: 50C

Cheers,
Remmie

[martin]

Yes most run these esc with no lvc because of the early cut off that they have with the Turnigy & Seaking esc. That motor you have is a y wind & is suited to 11.25 degrees - 15 degress timing, low timing under 5 degrees is for d wind motors. Martin.

[Remmie81]

Oh youre right about the timing. Think I mixed something up :doh:
Well, I will be reprogramming the ESC tonight :-)
Thanks!

[Remmie81]

ok, ive been out to the pond again. Although I have to search for another pond now.
When I start to accelerate I have 3-4 sec before I have to let go the throttle again because I ran out of water.
Not bad though from 0-> (almost) 60mph in approx 3/4 seconds.
But with only having 3-4 seconds of driving I wonder if the GPS is able to record the top speed (as it needs some time to measure it).

Main thing is that I have fun with it :-)

Ive changed the timing to 15 degrees and was driving with the x440/3.
Lipo discharged a little bit more then I wanted, but thats not a problem, it was not extreme hot and or ballooning and still was at almost 3,7 volt per cell as you can see on the pictures with almost same voltages per cell.

http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/Speed.jpg?m=1340009695
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/ESC.jpg?m=1340009674
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/lipo.jpg?m=1340009666
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/Charger.jpg?m=1340009690
http://www.x-ray99.com/pictures/var/resizes/Remmie/Pursuit-Mono/Charger2.jpg?m=1340009021

[1945dave]

I have a Pursuit which is basically the same hull, ran it with a 4074 2150kv on 4s for a year, spinnin an x442 it would top out at 47 mph or so, I threw 5s in it once with an x 440 to see what it would do and it got to 59 mph.

Nice build you have there, very clean and well thought out. Get some vid for us!!:thumbup1:

Make a wake, did you run the 4S with the x440? I am wondering how you got such a wide difference in mph going down a prop size and up one cell count. 12 mph seems pretty far apart.

Dave