im glad you ask about the extra r thrust Barry, was thinking today(whew!!) and i might add another 2 deg because i have to add 5 clicks r rudder to hover straight with no effort, soooooo yu might need more but id try it first and then make the decision, i am going to add 1 washer and see how i like it, i think that should be about 1.5 deg if i remember right my 60 was 3 with 2 washers[&:]