Thought I would throw this in for those looking for guidance.400 motors are plentiful. But if you decided to go to 500 size, Look here:http://www.cornwallmodelboats.co.uk/aca ... tml#aG1788
There are several 500 size motors, but here is the deal. Look close at the specs of the 500E 12 volt.
Low amp, slower turning. That looks like the 500 motor (if that is the size you need). Compare it to the other 500s. It looks like the 500 one would need.
Now, here is a catch. I can not find anyone else who carrys that motor. There might be another source out there, but it is not easy to find.
They are cheap. I already have one for the X tail Akula, and one for the Borei. Before I posted this, I ordered enough motors I will not have to worry about locating any more for any future projects (like a typhoon, Mike class, etc), or replacement. Now you can wipe out their inventory if you want to
A slow 500 brush motor with a low amp draw. Perfect.
Just an "old school" kinda guy