The coolest image from Cottage Regatta 2012

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Re: The coolest image from Cottage Regatta 2012

I'd also like to overhaul the ballast system and switch to a hybrid piston/snort ballast arrangement.

Using twin piston tanks either side of the ballast tank endcaps, or a single tank? I found some super little planetary geared motors on ebay. They're 3 volt motors, servo sized and operate fine on 5 volts from the receiver supply. If you run piston trim tanks from the regulated 5 volt supply, they're independent of the propulsion voltage, and you can use standard servo electronics to control the motors and piston position.