I use a apc 13x11 on my pattern plane as there is not enough ground clearence to go up in diameter. As a result I get tremendous speed as I am for maximum speed.

On a scale model using another 91 I installed a apc 14x10; all pretty conventional stuff.

The pattern plane weighs 7lb-3oz and the scale model weighs about the same as well.

I am impressed with the effort folks put into carving out special props. Well done. I do not have the patience to carve props, I however do blance them.