Hi JRCoone

Here is the info from the Great Planes website: it would seem that your motor is either a nominally 7.2v or 8.4v version, so it should be quite capable of handling the 9.6v from an 8-cell pack. If you have access to a Whattmeter, it would be very useful to find out exactly what the maximum current draw is going to be (obviously you'd have to measure this under 'static' conditions) - the worry would be if, on 8-cells, at high current your motor overheats. In flight the current draw will diminish somewhat, so if its okay static, it'll certainly be okay in flight.


T-600GD ESC System with Gear Drive

The T-600GD Motor System with Gear Drive is a more versatile and efficient performance package, capable of delivering more thrust and longer flight times than a direct drive system. This system is highlighted by a new high-torque T-600R (reverse rotation) ferrite motor for 7.2V-9.6V battery packs, a 2.5:1, GD-600 Electric Gear Drive, and a fully wired switch harness


This the most sophisticated of the new motor systems. It utilizes the same T-600R ferrite motor and GD-600 gear drive, but replaces the switch harness with an efficient ElectriFly C-30 High Power electronic speed control. The ESC is forward-only, with brake (to stop a folding prop) and B.E.C. with low battery cutoff to provide reliable power for the radio receiver. The high-frequency ESC is full proportional, providing full power for takeoffs while allowing the pilot to taxi the airplane to the flight line and vary the throttle during flight resulting in smoother, more realistic and much longer flights.

Ideal for electric-powered R/C airplanes having weights up to 56 ounces and wing loadings of approximately 20 oz/sq ft, and for 2-meter sailplanes


Here's a link to a set up for measuring amps/watts/rpm and thrust if you really want to get into it.

http://www.radiocontrolzone.com/for...threadid=116059

Cheers, Phil