54" Bonzi Fountain build

[ScarabChris]

Ok the hull and drive hardware is on its way. This build may take some time. I will be doing some paint job work, not too flashy though. I want the inside to be slick looking as well.

The hull should be here by this time next week, I special ordered it without the 5" spaced stringers they usually put in there for the gas engines.

Who knows when the drives, rudder and trim tabs will be here. MHZ-usa seems to be taking their time with order processing.

This is going to be a twin motor setup, I'm open to any and all suggestions for motors, ESCs and batteries.

I was thinking of those big ass Little Screamers outrunners. But Little Screamers has not gotten back to me.



X2

[westbeach]

Thats a great start. Me likey where this is going.

[Make-a-Wake]

Grab two Castle/Neu 1520's while they're only 65 bucks apiece...........5 or 6s.

http://www.castlecreations.com/products/neu-castle_motors.html

[westbeach]

twin 1520 to push a 54" hull?? Might be underpowered? I think it needs something bigger. 1717 maybe. Not sure what Leopard has for bigger motors. Definitely some Neu 22xx.

Grab two Castle/Neu 1520's while they're only 65 bucks apiece...........5 or 6s.

http://www.castlecreations.com/produ...le_motors.html

[Make-a-Wake]

You may have a point, but it all depends on speeds he's wanting. They should put out 4-5000 watts between them........6-7 hp.

[ScarabChris]

I'm looking for 50+ MPH. If I'm going to spend all this money on this build I want people to say "HOLY SHYTT" when they see it run. And I am going to want some decent run time so that means extra battery weight. This boat could be heavy RTR.

I would actually like to have it overpowered. There is a saying in real boating "its better to have it and not use it than to want it and not have it".

[Make-a-Wake]

You may want twin 2215's.................................

[ScarabChris]

In talking with Steve he suggested the Leopard 5692 motors. I like the price much better than the NEUs too.

Should I get the highest RPM per volt?

[Make-a-Wake]

NO.................lower kv and higher voltage. The 1090kv on 8s should work, and the 730 on 12s would run even cooler.

[ScarabChris]

OK so what voltage will the 8s and 12s batteries be? I was thinking the 1340Kv would give me 29,000 RPMs at 22 volts. If my math is correct.

Do I not want the highest RPM motors? Also run time is important. I don't want a 3 minute run time boat.

Placing a sizable order at OSE now. Steve only has one 730 but he has plenty of 1090s and 1340s.

[Make-a-Wake]

I bet others will chime in here shortly, but i wouldnt go 1340's on 6s each. 1090's on 8s would be more "torquey" and run cooler, and the 730's on 12s would probably be the optimal setup. The higher voltage lower kv motors will give you more run time as well..................my opinions.

[Jacked1]

You deff want 6000 watts or more. My 47in twin gets right under 50mph and I am using a gearbox and two Turnigy 880kv T600 outrunners on 8s (3kw each) to one prop and your boat is a little bigger. What I am going to do this summer is add another motor or two and put them all inline and change to the 1400kv version on 6s beacause the price of esc's.

I don't know why it would be different for other motors but as long as the power is the same and the unloaded RPM is the same I don't notice any difference between the different kv's and how they perform. ( and using the same prop and same weight of batteries.) The lower kv will have more torque at the same voltage as the motor with the higher kv but as long as u match the rpm with more voltage I can't tell a difference. Oh and the same total watt-hours on the batteries.

[ScarabChris]

6000 watts for the entire boat or per motor? Looking at the specs for the 5692 series motors on the Leopard website they seem to max out at 5500 watts.

According to their specs the 1090 will have a max watts of 5500, will run on 5-9s LiPo and pull 160 amps max. Looking at HobbyKing an 8s 5800 mAh LiPo is 29.6 volts which should give me the target RPM of 31,000.

OK I think I'm getting the LiPo/BL lingo now.

[Jacked1]

6000 watts total, 3000per motor. 2 big leopards will get you well over 50! :D

[ScarabChris]

Cool! So I'm placing the order with OSC now. Getting the 1090 Leopards, water jackets, Spectrum DX3S radio and some other cooling stuff.

That should get me started once the hull and drive hardware arrive, still need mounts, may make my own though. Once the credit card cools off I'll hit up Hobby King for some batteries and ESCs.