Which is a better APC prop to use on my 61fx ? 13x4W or 14x4W ? Thx.......

The 61 should turn the 13x4w like it was made for it....JW

...@ about 12000 rpm

Have you tried it ?......JW

My Irvine 53 had troubles turning the 13-4W but I bet the 61FX would turn it just right. I remember taching it at high 8000's. The 14-4W would probably be too much prop IMO.

14 x 4 on my 61fx mounted on a Extreme 330, seems fine to me. Much better than the 12.25 x 3.75 it had. The large prop calms the engine down for smother transistions of throttle.