RE: So small prop diffrence between .70 & .91?
Should I understand your answer like this Minnflyer:
70-fs: APC 13x6 / MAS 13x8
91-fs: APC 14x6/ MAS 14x8
(I have a graupner 11x6 on my TT46-pro and it's dent and bruised but refuses to break even after numerous ground hits. It's great!
I put an APC on the 70-fs and broke it immediately after slightly touching the ground on landing. Great performance but not sturdy enough IMO.)