ORIGINAL: DarZeelon
And as to the APC 11x6 prop... There has been a unanimous opinion on these pages that this specific prop exerts a MUCH higher load on any engine, than its prop factor suggests. It 'gulps' up more power, but gives good performance...
I suggest Pé Reivers look closely into this specific size... It may warrant a prop factor of its own.
Maybe categorizing only by brand and type is insufficient.
I found the Master Airscrew K Series props; although black, probably need a higher prop factor also.
They are spun more slowly than APC props of the same sizes.
Pé,