Well don't be discourage by those comment, while it's not as efficient I have run 4 blade for about two years when I was flying a older pattern models with little space for the 16 inch prop on the 140 L, I was running the 14.5x12 4 blade apc with very good success good pull good brake and bag of reserve power.

The top German guys were all running the APC 15.5x12 4 blade at the last world....very successful I might add.

Since moving to a newer airplane design I'm running OS 140 RX with the 16.5 x 12w on ES pipe and 25% cool power.

You do not need a 800.00 motor to be happy.

Daniel D.