Originally posted by DarZeelon
For most normal .60, an 11x8, or a 12x6 are closest to this target.
With the 11x7 almost any .60 is under-propped.
The K/B 61 is listed by the manuf. as 1.32 horsepower-definitely not nearly as powerful as any of the modern 60's. Just about any modern .46 has more horsepower.
I fly my late 80's K/B 61 on a R/C Special with an 11 X 7 prop, and it runs like a dream. The prop and the engine seem a perfect match.
Copterdrvr