RE: Frenzy!!. . .New Design pushing the limits
Just doing some off the top of my head calculations.
8.2" aileron chord.
16" aileron span
Roughly 125" area per 1/2 aileron.
Assuming your pushrod geometry is equal (1.5" servo arm, 1.5" control horn), at 50mph a servo will need to deliver 244oz" of torque to drive the surface to 60 degrees. So you COULD use an 8611 on 6v and drop it into the same servo mounts with very slight modification. Of course.. the instant you deflect those surfaces you'll slow down to well below 50 mph due to drag, thereby reducing the required servo power.
If you change your servo geometry slightly.. you can get more effective power to the surface.
Reducing your servo arm to 1.25", your control horn to 1.4" and increasing the servo travel to 75 degrees each way takes your max servo loading down to 160oz" at 46 degrees deflection with the max of 60 degrees requiring only 110oz", well within the limits of an 8411 on 6v.
Regardless.. if you kit this.. I'm interested in building the smaller one for electric.