Depends how fast you want it to go!
Electrical kit is either rated continuous or intermittent. Continuous ratings are usually conservative - you can exceed them somewhat - but they also assume decent cooling
. The inside of a boat is usually sealed, and so is poor for cooling
unless specific provision is made.
Chinese ratings tend to be a bit unreliable - and watch out for cheap kit with phenomenal specs that are only achievable if you plunge them into liquid nitrogen!
I typically run my 12v rated brushless motor
s at 7.2v. That way they just get a bit warm in a sealed boat and need no cooling
For brushed motor
s the brush
es tend to be the weak spot if you put a lot of amps through them. Check your motor
s for heat after a run and you'll soon find out if you're mistreating them...
If you're thinking about Taycols, the smaller ones were definitely brush
-limited. Though the bigger ones are typically rated at 12v, the initial review for the Standard reckoned it could take 20v or more. Open frame motor
s are easier to cool. But I wouldn't like to guarantee the paxolin bearings
if you did that...