hey bj;
.82 will be very nice. i have flown my lt-40 with a .46 2 stroke, an enya .90 4-stroke, and an o.s.7o 4-stroke. after a few hundred flights and a rebuild as a tail dragger, flown with a saito .90 a supertigre .90, both glow and the gas conversion, and now with an os pumped .91 4-stroke. you may notice i favor the 4-strokes, as they match engine torque and prop speed better to the speed of the model. our field altitude is 6002 feet. hope this helps you.