Electric power boat

hey guys

Finally I've decided to spent some money and start a garage project.
I want to make small electric powerboat for one person (~25 mph or more) but I'm not good in electrics so I need some help, what dc motor should I use, what battery? lets say for 4-5 hours of running? boat weight about 70 lbs my weight ~140......... ok it will be in test day i promise .
sorry for my english.

 

You want to go 25mph? for 4 hours? 100miles?
If you could do that at 25kW (about 18bhp) you would use all the energy in the very latest Tesla car battery. The battery alone would weigh more than your boat could support. Impossible.

 

Error! Not spotted by anyone else? In the post above I should have said that 25kW is about 33bhp - got my conversion wrong way round.... and can't edit it.

 

Off the top of my head
Go to Torqeedo
get an =9.9Hp I'm guessing tiller short shaft with a planning prop
get a couple of Battery paks - charger
plug and play

 

The most efficient way is with an AC motor and you use a controller/invertor which takes the DC from the battery and converts it to AC for the motor.

AM Racing AMR 250-90 Single AC Motor - Liquid Cooled, Permanent Magnet - Remy Cartridge, EV West - Electric Vehicle Parts, Components, EVSE Charging Stations, Electric Car Conversion Kits http://www.evwest.com/catalog/product_info.php?cPath=8&products_id=297&osCsid=imuqrom91sbs5subq99ougtpv7