Took out my VF Extra 300S 66" (with Saito 100) today. I changed the prop from a APC 14x6 prop to a APC 16x4W Fun Fly Prop. My engine RPM changed from 10,040 with the 14x6 to 8,700 RPM with the 16x4W.

The prop performed awesome! Tons of power. The only thing that scared me was a high pitch sound coming from the prop at full throttle. I first thought it was flutter, but the guys at the field confirmed that it was only prop noise.

Very happy with this prop and engine, and I wouldn't change anything about this plane.

Just my two cents.