Well,it seemed the 14x8 was a bit much. I did have trouble getting it to reach a consistant top end. After playing with it on the ground,we stuck on a 14x6 and it was noticably better. I still actually though that even this prop was a bit much for my Big Stick as it wouldnt stay put at idle. The plane just wanted to roll away. The field instructor had his skybolt there with an OS .91 swinging a 14x4 sport prop and as always.....it flew fantastic.

I did get to test the Thunder Tiger .91 4 stroke(this was the whole purpose) and it ran ok,although it is fussy to tune. I think if I do fly this plane/engine combo again before taking the motor off for my new Hog Bipe.....I'd try the 14x4,just to try to get the plane to sit still while idling.