The most important information in Bryan's trimming guide is the starting point.

* Set motor to .5 down, wing .5 positive and stab zero

1. Beginning set C/G 25-30% (of MAC)

I had set the motor and wing but had ignored the cg. The previous owner (a top pilot) told me to put the battery pack all the way back. The problem was, my packs were 6.5 ounces heavier and I had switched to a Contra that is heavier and its cg is further forward than his motor/gearbox was. I adjusted the wing and the thrust line many times with no success. Finally, I found that program and found out where the cg should be, got some lighter packs and added some weight in the tail.

The plane is flying much better now.

Getting the cg right is very important.

Jim O