Hi,

I run JR 911's at 6 volts (through a regulator) in my ultimate. Plenty of power, but then, I don't really 3D it. I am flying the sportsman pattern with this plane though.

while you're at it, I hope you've strengthened the undercarriage mounts and thrown away the wire u/c that comes with the kit. I ended up fabricating a kevlar/carbon u/c that's been great. I also laid up a new cowl as the plastic one didn't last long.

Its my favourite flying plane, the Ultimate.

Steve