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I'm glad to hear the first tests went well. The pitch controller kicking in on the turn was certainly not something that would have crossed my mind beforehand. You've discovered something there methinks. As regards the brushless motor I'm pretty sure I saw a brushless duck somewhere (YouTube?) that was performing some amazing contortions - so that might well be a possibility. If I can find the url again I'll post it.
That pretty neat, but I need more speeeeeed.....
I need to do some reading up on Brushless motors, I have no ideas about chosing the right one for my sub. I'd like to keep it on the 12v battery I have the moment (not headache trying to remove the lead ballast I have bonded in).
After reading the comments about more speed I went and had a look inside the model I have of John Cobb's 'Crusader' to check the set-up. This uses a Hacker BSO-11L brushless motor currently running on 12 cells (but can run on more). The esc is a Hacker Master 99-3P. This thing shifts - albeit in a straight line as befits a World Water Speed Record contender of the 1950s. The Hacker url is: http://www.hackerbrushless.com/motors.shtml
Now there has to be something there that will make the sub perform the way you want!