How to build a Hydro2 boat for racing?

[simengj]

Hi, does anybody know what propp an motor that is good in a hydro2 class boat?

I am thinking a rigged insanety outrigger, fiago 9L motor, 38-42mm metal propp, 5500mah 4s lipo and a good esc.
Everything is going to be bought here at offshoreelectrics.
Will this be good for a 5 min race?
What about a XL motor?

Some advices would be great!
I will start building in a week or so.

Thanks.
Regards, simen.

[simengj]

hmm

Maybe a neu 1515 1,5D on 4s1P would work
Shuld get some speed, but will it hold for 5 min?

[raptor347]

We don't run the duration style hydro events over here but I'll post my thoughts. Since you're running 5 minutes you'll want to set it up to use ~75% of the pack capacity in that time span. You're looking at 12C discarge rate so 60 amps and 900 watts or so.

I'd back down to 2100-2200 kV rather than run the 2700kV 1515/1.5D. I'd give serious thought to the 1415/1Y. It's the right wattage range, lighter than the 1515 motors and standard cooling jackets fit.

As far as boats go, the rigged insanity is a good kit. I've got a glass boat that might work. If you like to scatch build, you could always scale the JAP rigger plans over on IW to the proper size.

[NativePaul]

The 9L or 6XL are decent H2 motors on the cheap with a x435 or well cut x637, I think the 1515 is overkill, if I was getting a Neu it would be a 1512/1y

[simengj]

Thanks!
It would be fun with a neu 1515 1.5D, sick speed with a m440 or a S215

My fecalc says around 52mph, 6 min runtime with a neu 1515 and a x430 propp,
sounds very good. (rigger, racing hull)

(70mph with a S215 )
Is the FEcalc very realistic?

i could buy the neu for insane speed, and a 6xl for racing.
Money is not a very big problem at this time.

[BILL OXIDEAN]

Thanks!
It would be fun with a neu 1515 1.5D, sick speed with a m440 or a S215

My fecalc says around 52mph, 6 min runtime with a neu 1515 and a x430 propp,
sounds very good. (rigger, racing hull)

(70mph with a S215 )
Is the FEcalc very realistic?

i could buy the neu for insane speed, and a 6xl for racing.
Money is not a very big problem at this time.

I like Raptor's idea with the smaller diameter motor (1415). That seems to be the trend overseas, long can with a slender diameter draws less amps

I'm not too sure about a 1515 swinging a tiny x430. the calcs may sound right, but I'm willing to bet a 1515 needs a bit more prop to get any bite..

[simengj]

I like Raptor's idea with the smaller diameter motor (1415). That seems to be the trend overseas, long can with a slender diameter draws less amps

I'm not too sure about a 1515 swinging a tiny x430. the calcs may sound right, but I'm willing to bet a 1515 needs a bit more prop to get any bite..

I dont understand, does the motor ned more load to preform better?

Okay, where do i get the 1415 motor?
Any tips on propps?

If this motor vill be a better motor than the fiago 6XL or the 9L motor. I vill go for it.
Vill this motor be able to push my rigger in the 60s if i want to with 6000mah 30c lipos?
Thanks again!

[raptor347]

The lower turn motors hit max efficiency at higher current levels. The no load current on the .5Y and 1D motors is high, that being the penalty for very high current capacity. The higher winds are more efficient at lower currents.

The 1415 is a "new" Neu. It runs the same rotor as the 15 series with a redesigned stator laminate. Originally designed to fit in ducted fans and cars/trucks requiring a 36mm motor diameter. The 1415 is within a few grams of the 9L and half way between an L and XL in length. Sounds like a near perfect motor if you want to spend a little more money ($189). Any Neu dealer should be able to order one for you.

If you put it in a good boat, it certainly should go 60. We're geting 60+ out of our spec riggers running the Aquacraft UL-1 power system. But we only run them for about 2 1/2 nimutes max (mill time,1 mile race and return to shore) and usually use ~2400mah. kV on this motor is 2030 and we run 1816 or H-10 ABC props.

Consider the the ABC 1516 and 1616 props for your application, possibly the 42x55 with a bit of tweeking.

[BILL OXIDEAN]

The lower turn motors hit max efficiency at higher current levels. The no load current on the .5Y and 1D motors is high, that being the penalty for very high current capacity. The higher winds are more efficient at lower currents.

I noticed that to be true, but I thought I was just nuts! A motor can literally run hot from being "under" propped!! I learned it as well on the bench free revving a super high kv motor.. heats up relatively fast..

[simengj]

The lower turn motors hit max efficiency at higher current levels. The no load current on the .5Y and 1D motors is high, that being the penalty for very high current capacity. The higher winds are more efficient at lower currents.

The 1415 is a "new" Neu. It runs the same rotor as the 15 series with a redesigned stator laminate. Originally designed to fit in ducted fans and cars/trucks requiring a 36mm motor diameter. The 1415 is within a few grams of the 9L and half way between an L and XL in length. Sounds like a near perfect motor if you want to spend a little more money ($189). Any Neu dealer should be able to order one for you.

If you put it in a good boat, it certainly should go 60. We're geting 60+ out of our spec riggers running the Aquacraft UL-1 power system. But we only run them for about 2 1/2 nimutes max (mill time,1 mile race and return to shore) and usually use ~2400mah. kV on this motor is 2030 and we run 1816 or H-10 ABC props.

Consider the the ABC 1516 and 1616 props for your application, possibly the 42x55 with a bit of tweeking.

Thanks! now i finaly know what motor to put in my rigged insanety boat!

Vill the abc 1516 and 1616 or the Grim 42*55 be good for a 5min race? (in 60mph?)
Or just for having fun at insane speeds?

60mph in 2 mins with 2400mah is very good!
Should be able to run 60 with 6000mah for 5 min...
What do i need to tweak?
Could you recomend some props that OSE have? buying two props from another place can be verry expensive to norway..
OSE could get the 1415 motor to?

[sailr]

If OSE doesn't have the 1415 motor, you can get it from Castle Creations but they are special order and it takes about 3-4 weeks.

[raptor347]

The Grimracer 38x55 and 38x63 are very close to the 1514 and 1516 ABC props. Those two should make 5 minutes if the boat is running well.

The 42x55 is good too.

Any Neu dealer can order the motor.

[NativePaul]

The higher KV motors do have a speed advantage, hydro 2 motors have been going up in KV over the last few years and now seem to have settled on 2800 for the last couple of years although at the Nats this year there was a guy with 3300 on the new 35c cells and he sure wasn't hanging around.

I doubt you will find a 4s 6000mah 30C pack that gets under the 560g Hydro2 weight limit, but if you've found one let me know, I'm still on 30C 5000mah and an extra 20% capacity would be nice.

[raptor347]

How big are the boats you guys are running in Hydro 2? How much capacity are you actually using in 5 minutes? What are the normal props? What sort of speed are you getting?

[simengj]

The higher KV motors do have a speed advantage, hydro 2 motors have been going up in KV over the last few years and now seem to have settled on 2800 for the last couple of years although at the Nats this year there was a guy with 3300 on the new 35c cells and he sure wasn't hanging around.

I doubt you will find a 4s 6000mah 30C pack that gets under the 560g Hydro2 weight limit, but if you've found one let me know, I'm still on 30C 5000mah and an extra 20% capacity would be nice.

So a neu 1415 1,5d would be better with a smaler propp?...
Are you racing with H2 boats?
What motor are you running?
neu 1512 1Y?
should be a good motor.. OSE have it also.

Here you have 2*3000mah 35c=6000mah 35C, cheap style lipo...
Maby they are good, maby they are not, i dont know.

http://cgi.ebay.com/RC-3000mah-14-8v-35c-LiPo-Battery-Akku-4S-cells-30C_W0QQitemZ160352116310QQcmdZViewItemQQptZRadio_Control_Parts_Accessories?hash=item2555bb1e56&_trksid=p3286.c0.m14