Which Feigao For Heavy Hydro??

[FLEETMASTER]

As the title question says.......It is an Equipage Tornado,all wood hydroplane.
I plan on fitting a flex drive and strut,rudder etc.
I will be using either 4 or 6 lipo cells.Using it for fast sport running.
They are 80cm long and around 1.85 kg with no electrics,so quite hefty.
Not sure whether Feigao XL would be suffice,or whether a KB may be better?

A Hacker,Lehner or Neu are out of the question trying to keep the price down.

Suggestions of KV,prop size to start with would be great.I am leaning to 4S,but will consider 6S if that's truly neccessary.

Thanks,
Fleetmaster.

[Steven Vaccaro]

At 31" or so this is not a very large boat but is heavy. Was it designed for rc or static display?

[FLEETMASTER]

Steven, they are designed for rc use.They come with a Johnson 700 brushed motor and can use up to 14 cells.

[Steven Vaccaro]

A 700 johnson is good for 300-500 watts, you can easily produce more power with either a xL fiegao or kb45. On 4s I would run a 10xl feigao motor.

[FLEETMASTER]

Ok, I have sold one of my nitro cars,so i'm back to planning the power system of this beastie.
I'm looking at running it on 6S Lipo power and a KBXL.

What KV should I be running? Also a starting prop size??

[SJFE]

I would drop to 4s on the kb8 and run a lifting prop around 40mm to start. I don't know much about hydros but in my big cat the kb8 pulled about 90 amps constant on the 40mm prop. Total weight of the boat was 6 pounds. I had some spikes of over 150 amps probably while cranking the rudder over hard @ wot.

[FLEETMASTER]

Thanks,the KB I have is 1700 kv. Is that close to what you are suggesting? (I cant see anywhere on it how many turns,but can remember it as 1700kv,which I think is higher than the 700 Johnson that was in it.
I'll give it a go on 4S and a smallish prop,as it is sub surface drive at the moment.(scale correct location)I may end up going the surface drive route eventually.
Steven has some cool looking setups.

[FLEETMASTER]

I think that this hull works out to be around 4 kg ready to run.(8.8 pounds ??
sorry,metric is my more my thing)