Hi Pilot
I have the Precedent Huntsman 34" hull with the 3648-1450kv, 100 Amp car ESC, 2 blade 40mm 1.4 pitch CNC prop and at present only running on a 3S 5800mah Lipo.
I am still working on the cabin and that windscreen.
Installed the front, rear, toilet and kitchen windows and frames today.
The boat is very quick in the 35-40KPHour mark, so it's not slow.
Canabus

hi .thank you all for your help.i have built the boat to power setup stage the kit by the way is a precedent huntsman 31 wooden i.will look at the hobby king site keen to get on with it
steve

Hi Pilot
If you are using 540 can size (35-36mm brushless motor) a 3639-1100kv 800watts, 3648-1450 1600watts or a XK 3674-1900 1769 watts.
All run on 100Amp ESCs, but check the maximum voltage they handle.
I use car ESCs with the electric fan on top because they run cooler at slow speeds and no water plumbing required.
The same with the motors no cooling.
Props for these motors 37mm 2 blade or 40-45 mm 2 blade.

If you go for a larger motor for a larger prop, a L5055-700kv 1600watts same ESC, but, start with a 2 blade prop about 52mm.
Battery a 3-6S 5800mah or more with a C rating of 40 plus.
I have used the 35mm motors in 34 to 40" boats, but, for my 46" Vosper Crash Tender I am going to the 5055.
To large a prop will cause over heating of the ESC, battery and Motor.
A in line amp meter(Hobbyking 9598000004-0) is the one in use.
It reads the maximum amps, so for run speed amps slow speed up to maximum as a hit the throttle hard will give you maximum amps.
Canabus

Hi Pilot, first of all welcome to the forum. Do you have any modeling experience?? Which kit or plan are you using???
I would recommend an outrunner look for one with about 700 - 800 watt output, 3s or 4s rated with an ESC rated at least 100 - 150 amps, as a start with a 40 - 45mm brass prop.
Kit or plan, reduce the angle of the propshaft to about 15 - 20 degrees electric motors can lie lower in the hull which was designed for I/C motors with their flywheel hanging below the motor, needing extra clearance.
Suppliers. Have a look at the hobbyking site, for motor and esc, once you have the basic build underway, decide on the batteries you are going to use.
Hope this helps as a starter, look round the web sites get more info and we can direct you further as to your requirements

Regards

Mark