Prop Tech info
A 10-6 prop has a diameter of 10" and in one revolution would travel 6" assuming 100% efficiency.
A 11-6 prop has a diameter of 11" and in one revolution would travel 6" assuming 100% efficiency
The 10-6 is normally used on a "40" engine.
The 11-6 is normally used on a "46" engine.
Enjoy,
Jim