Outrunner brushless generally work better in boats.
I see you intend to use LiPo's so suggest you also buy a wattmeter from GC. This will help you select the correct prop for your chosen motor so that you do not exceed the Max watts on the motor and the current (C) rating on the LiPo. A good balanced Lipo charger is really necessary as unbalanced cells easily damage if over discharged. Good luck and please keep us posted on your progress. Dave

Thanks have also found a couple of brushless motors:

http://www.giantcod.co.uk/28mm-inrunner-c-25_85_186.html?page=1&showAll=1&sort=2a


looks like the 2200 kv will be more than powerful enough.

Future plans include the 46" Kingston hull, but the Deans kit will get me started.....

I did this earlier this year. I put a 480 7.2 graupner in with a 2200 mah 4/5 SC 7.2V MiNh race pack. Goes like the clappers ( far to fast really ). in reto, I wish I had bought a Kingston hull and plan as the Deans marine boat is OK but small and this boat is not difficult.

no not purchased as yet just doing some research. Also intend putting a brass prop on it but it doesnt tell you anywhere what size is required..........any ideas?

they do a race 400 that will do fine a 500 is to heavy, go brush less that is about the same Price but a bit faster, but remember you can put to much power in a small boat I did with mine . and have reduced the power, look in the boat blogs and you will see mine built of a deans hull, have you bought it yet ?

Peter

sorry, the title didnt come through! its the Deans Marine kit,

http://www.deansmarine.co.uk/shop/product_info.php/cPath/10_14/products_id/213

which is 610 mm long.......

can you tell us the name and size of boat and we may be able to help

Peter