Interesting prop stuff

First the bad news: The Xoar 18x10 was mediocre. Not horrible but not nearly as good as the APC 18.1x10. Maybe better with some re-working, however I'm looking for right-out-the-box good.

Up until today, the top contender has been the APC 18.1x10.

That might've changed today after running the APC 15.5x12W. I had little confidence when ordering it - and even less when bolting it on - that it would be suitable for the SAP-180 and a pattern model. When the model took off, it appeared to lack speed and zip, seemingly confirming the low expectations. But after flying through several elements of the Intermediate sequence, I began to realize just how incredibly right it was!

Vertical was unlimited, with authority, and did not lose momentum even with multiple rolling maneuvers. The vertical speed was not as fast as with the 18.1x10, but it had a more "torque-y" feel to it, like a good 2C glow engine on a pipe, and the speed was a lot steadier through all maneuvers at 45 deg and SNL. It actually helped me fly the sequence much better than I've flown it before.

On top of all that, it was MUCH QUIETER than the 18.1x10.

I hope one of you longtime pattern guys could give this prop a try. I realize the diameter sounds as if it is not adequate, but for whatever reasons it was an excellent performer for me today.