Here are some links following a search on this forum:
**LINK**
and here are some more from 'The Other' forum (Enter Perkasa in the box and hit Search)
**LINK**
You'll receive more helpful replies if you do some basic research yourself, John. These two searches took me less than two minutes, and there are plenty of other RC model boat forums (fora?) about, too. Have fun!
I've not built a big Perkasa so I'm unable to suggest anything from first-hand experience, except to avoid using sealed lead-acid batteries for power – they are too heavy. I would also tend towards using brushless motors.
DM
Edited By Dave Milbourn on 02/09/2016 09:53:53