Gas Sport Hydro FE conversion

[mtbenjamin77]

Anyone have any suggestions for brushless motors comparable to a QD 25cc HT?

[Fluid]

Castle 2028 on 8 cells. Spins gas-sized props plenty fast.



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[mtbenjamin77]

That is exactly what I wanted to hear. Do you have any experience converting gas to FE

[Fluid]

Not exactly. I have build several gas boats with 8S and 10S electric power, as have many of my club members. But none of us has converted an already-rigged gas boat to electric. A fine distinction I suppose. What would you like to know?

My 10S Stryker Cat:
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[mtbenjamin77]

I'm really looking for some prop selections. I have contacted Bob Austin about the FE setup I know he specializes in Gas engines but I'm sure with his experience he'll be able to work up somehting good for me. As far as the conversion. I think the hull I'm working with will be fairly simple it has standard 5" rails and plenty of room for battery placement for and aft of the sponsons. The hull will have a very simple sub hatch to seal everything off. I'd like to run 8S I have the dinogy 4S 6000's. Can you post a few pics of your FE gas builds? I have run several gas boats (check out my avatar, thunderbolt QD 25c HR) but never a FE this size. Have you found any key differences in the setups between gas and FE?

[Fluid]

Sure, here are a few shots of monos and cats. Only two club members run 10S hydros and I don't have any good interior photos. As for 8S props, I'd run 65mm to 70mm on the Castle, the pitch depends on the weight and running attitude of the hull. Rpm will be slightly higher than the QD, closer to 20,000 rpm. A 1665 may be a good place to start. Most of us run 10S and the props range from 60mm to 65mm. A pitched-up x462 has pushed one member's Hurricane to 74 mph.

Differences between gas and FE? The FE build will likely be heavier than a gas build, which we find to be a good thing. With instant FE power acceleration is not an issue and the extra weight helps keep the boat down in rougher water. Rig your batteries so they can be moved fore and aft a bit - this is a big help when fine tuning the CG. I am a bit anal about battery hold down - seen too many packs come loose in a 60 mph flip and knock off the hatch, flooding the hull. I use velcro and straps or bolted hold-downs to keep them in place, like the top and bottom photos.

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[mtbenjamin77]

Fluid,

what type of ESC's are you guys running? I see in the pics a shultze 60140 and those aren't cheap. Correct me if I'm wrong but isn't that a 140 amp? I wanted to use all castle elecs. Prolly and HV200. What's your thought's?

[mtbenjamin77]

What's total mah's? 2s2p 10,000mah? I was hoping to use 2s1p 6000mah to reduce the weight. I guess I could run either setup just with different run runtimes.

[RaceMechaniX]

There are several: Castle 2028, Neu 2220-2230, Lehner 3040-3080, Scorpion 5035, Leopard 56 series.

Castle's work very well and are an excellent bang for the buck. Schulzes, MGM's and YGE's are more expensive buy have better manufacuring details. IMO Castle tends to rate their esc's on the upper limit where as Schulze particularily with the 40.160 is underrated.

TG

[mtbenjamin77]

Tyler,

Thanks for the info. I guess I got the schulze backwards it's 40160 not 60140 duh. I'm prolly gonna go with the castle for now, like you said the best bang for your buck.

Travis

[RaceMechaniX]

They are good reliable ESC's when you use them within their boundaries. The logging feature will let you know how much current and prop you can handle. Use good connectors and 45C batteries if you plan on running 1P although I recommend 8000mAh min for this type of set-up.

I put a 2028 and ICE200HV in a 48" thunderboat. It ran right aound 65-70mph on either 8s2p or 10s2p.

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[mtbenjamin77]

yeah I figured I'd need to double up to 2s2p with the dinogy 6000's that'd give me plenty of mah's and they're rated at 65C

[RaceMechaniX]

2S2P is N2 power class, you mean to say 8S2P, 10S2P or 8S1P, 10S1P

[mtbenjamin77]

yeah, I was thinking 2 sets of 4s in series then 2 4s in paralell which would be 8S2P or wait yeah just 8S2P, ha.

[GRAEME LOUW]

Hi Tyler I like the clever idea holding the water cooling pipes in place with paper clips
Cheers
Graeme