prop size
 

I have a Kadet senior w/surpass 70-Would like to fly slow-Will a 12x8 or 13x6 be a better choice?

RE: prop size
 

I run a 12 x 8 APC on a Sig Something Extra and it hauls butt, so I would go with the 13x6 wood prop at 1/4 throttle and she will creep. I have ran 14 -16 on the 91 surpass on a big trainer and it worked great. If you find a larger prop is to much of a load on the engine remember to use your left thumb, that will always let your plane fly slow.

RE: prop size
 

It is turning 10,950 rpm with the 12x8 and 10,000 with the 13x6.