… with an 11X6 apc pusher. I'll try to max it out even further on my next flights. I was wondering if a 10X7 apc pusher qould be better for speed?
My Bob Cat is 8 lbs and recently changed to an OS .50. I have two flights with 11 x 6p and 2 with a 10 x7p. It lifts off from grass with more authority with a 10 x 7p with maybe 8 to 10% more authority. Lift off with 11 x 6p was slow, scary and once at stall speed.
11 x 6p APC turns 12,500
10 x 7p APC turns 13,500/13,700
In flight with 10 x 7p seemed to require less throttle although both props were OK in the air. I found more reserve power with the 10 x 7p. Will be interested in your findings.
10X7 apc pusher qould be better for speed?
Don’t know.
Additionally over a minute ground run time with a pusher seems to overheat the engine. Often the engine will sag during the take off roll or immediately after take off which is not good. I have started to crank on the runway, quickly check rpm, and go. Also I left the idle deliberately richer than normal.
Bill
Should have also mentioned that I have another Bob Cat that has been sheeted, glassed and painted that will be 10 lbs or more after adding engine and radio gear.