From my experience, APC props have been; size for size, more efficient and with higher thrust, when compared with Master Airscrew props.

At the same time, the APC also imposes a greater load on the engine and RPM was always lower.

My most recent experience is with Bolly Clubman propellers.

Although the +0.5" size is heavier than the MA and imposes a still greater load on the engine, its thrust capability is paramount.

The current, up to 11" MA G/F series, is a great improvement over the previous MA design, but after changing from the new MA 11x6 to the Bolly 11.5x6, the T-34 I fly with an OS.46FX was transformed.

Even though RPM is down by about 700, the plane pulls itself straight up, accelerates out of a hover and even attains a higher flight speed. It also slows more noticeably for landings.

The APC is capable of higher safe RPM and its tip efficiency is probably higher, but a little "kiss" with the runway is all it takes to need replacement, while the Bolly can be used again after the same.

It has been said that the MA props have shown optimistic RPM figures, because they are underpitched.

Sincerely,