Originally Posted by
beatsal
Forgot to ask ref your comment below. From the point of view of just freeing the engine and getting it to start, which is the best size prop from below?
"A 10x4 is a perfect match for peak revs-or if you had CL in mind a 9x6.....in the unlikely event you felt compelled to fly it in vintage team race-then an 8x8 might be appropriate. For vintage R/C perhaps a 10x5-but if you want to chug around gently it will have no trouble hanging on to an 11x4, 11x5 or even larger diameter for something like a lightly loaded slow flying vintage model. Its a big heavy motor, and produces just over 1/4 HP. "
Given your lack of experience, I'd go for something like an 11x5-it will have more flywheel effect and make starting easier. A 10x4 turns (it will vary from brand to brand of prop) about 10,000rpm on the bench-so in the air it will unwind to bang on the power peak of around 11,000,,,,,but that's academic at this stage-you still have to acquire the starting and handling skills-and that will be a little easier on a larger prop.
ChrisM
'ffkiwi'