Hi there

what to say more...

all above is right. I used to use spiral alu pipe made by me using a battery which diameter is close to 540 class motor. You can also buy it for some bucks

This is the most simply method of cooling your brush motor. The most sophisticated question is what area should be cooled. A man can say thet all motor can is to be. But if you want to do it in right way, first there is a need to cool the brush area, then magnet area. Some magnets, specially produced in china dont have their characteristics. Usually good neodym magnet needs no cooling but this is only theory.

So, making any answer, better cool your motor using water.

A hope you know where the inlet water 'point' is. There are many methods to do it. The most useful is to make a hole in the bottom of your hull close to the edge of it, lets say 1 cm from the edge. Then your flow will be LAMINAR.

Regards

Peter



Better ugly boat than wise mother - in - low !!!