ORIGINAL: Knife Edge2
My club has been using OS Max LA .40 's for our pylon races but they have been discontinued. We have been looking into the GMS .40 ABC . We would like to have something similar to the O.S we were using. Any comments?
The OS LA .40's are about the equivalent of a GMS .32 engine ( or less ) in terms of power.
If you switch to the GMS .40 ABC's you find that the guys flying these will have far more power and speed than those flying the LA .40's.
Wonderful engines. Leave the needles as they come. Run them at varying throttles for a couple of tanks, tune a bit, another tank, tune more, retighten the cap screws and make sure everything is tight then fly.
Note the warnings about tightening the muffler screw when the muffler is warm, or else the exhaust will rotate in flight.