garch 22:

I got to thinking about it and looked at the two motors, the .75 is not very far from the .91 in size but the power is very different, vertical performance with the .91 on the GP extra was not unlimited but I;m not into 3D so I didn't need it to be, but the GP Extra was in the 8.5 to 9 pound range with a 65!QUOT! wing span so the VF Extra in the 7.5 to 8 pound range should be very close to unlimited with the .91.
The .91 weights out at 1:14 5/8 and the .75 comes in at 1:8 1/8 so for a 6 ounce difference the .91 is definitely the way to go. and the .91 can be had for $109.00 at
http://www.atsrcplanes.com/index.htm
Check the pictures for size comparison.

Miloh.