I recently acquired a used 140DZ and plan to put it on an OMP 79" Yak profile(3D funfly type). It has been recommended that I start with an 18X8 or 19X6 APC. Does that sound reasonable? What about a carbon fiber prop? I will be using 30% DZ fuel at 6000' altitude. Thanks for any input!!!!! Dale

Either prop MIGHT work OK. For a fun fly type airplane, you should shoot for around 8500 to 9000 rpm peak, so prop accordingly.

Thanks.