Originally Posted by mxandrews1
This is a repost:
The recommended power pack setup comes with a 13x4 prop Using this power setup, what is the smallest prop I could safely use?
I'm looking for something shorter so blade strikes will be less prone.
The attached chart gives the theoretical volume of air moved by each rev of the prop.
The 12x5, 11x6 or 10x7 would closely match the 13x4. All that said the larger the diameter of the prop, the more pulling power, and the larger the pitch the more speed. The Fun Cub is not a speed plane, so it is best to use the largest diameter that will work with the ground clearance and power available.