Hi, a question please from anyone looking at this post ( who knows for sure)
I have a thunder tiger .61 Pro engine. The manufacturer recomends a 11x7 prop for
break in, and 11x7 for both sport and aerobatic applications,
I understand a longer prop and correct pitch will deliver more thrust at lower rpm.
Could I use a 12, 13, or 14 inch prop on this engine?
The main reason im in wonder is, the cowl on this plane is unusually wide, and the 11x7 prop I have mounted presently
only extends past it by One inch on each side, about four inches top and bottom.
Im worried this prop dosnt extend past the cowl enough to provide the correct amount of thrust.

This engine is for a 60 size Extra 330L airplane, and I looking for maximum Aerobatic performance.
Help on this would be greatly appreciated!