RE: So small prop diffrence between .70 & .91?
IMO an 11x6 prop is a little big on a TT pro 46. Also if the prop is all dented up it may need to be replaced. First of all if it is out of balance it could damage the motor, second if it is dented up it could break it use... not a good thing.
Also, how is your prop setup. When the engine is not running where does compression start. The prop should be at about 2 o clock. I was breaking a bunch of props until someone told me to do this. Now I never break props.