I'm sorry for the mix up I meant a os 91 like in the title. thanks for the feedback.
If i didn't go full throttle, could i use the 91 though?
the weight difference is a mere .01 oz, but propeller diameter comes into play.
Can someone take a quick measurement on their alpha 60 and give me the largest dia. prop that's practical ?
If the smallest dia .91 prop is larger than the max clearence on the alpha 60, there's no point in looking any further.
thanks again for the input.