I was using a 10x6 prop, but recently replaced it with 11x6 in hope that a bigger prop would pull more air, and give me more power.
The front wheel is 2 3/4, and the backs are 2 1/4, the plane does tip upward a bit because of this.
It can take off on short grass, if it nips the grass with the prop at all then I can't gain enough speed.
It's turned 1 1/2 turns from being fully closed (the suggested amount in the manual). When fully throttled up, turning the needle in either direction it seems to lose power.