It might be easier when discussing to call them low and high rates. Dual rate is what it does. So your low rate is set at 100% and your high rate at 140%. I also like to have my switched be up for high rate and down for low rate. It's easier to remember.

40% is the size of the plane, it has nothing to do with the radio. If a Full scale Extra 300 that a man sits in and flys has a wing span of 30 feet. Then a 50% model of an Extra 300 would have a wing span of 15 feet. A 40% model of the same plane would have a wing span of 12 feet. ( 30'x.40=12')


david