ORIGINAL: gunneredwards
My 55 is turning 13600 rpm with the stock muffler and I am swinging a 12x8 on it-does not bog down and on a 6 oz tank in my dazzler I get about 14 minutes of actual flight time. I usually run 1/2 to 3/4 throttle. love the ax.
dan
There is something wrong here, that's a lot of prop at that rpm. Either the your tach is malfunctioning, you are mistaken about your prop size, its miss marked or it's inefficient.
OS lists recommended props as: 12x7, 12x8, 13x6, 13x7 however these are not for ultimate performance, but for noise reduction.
Try some APC 12.25x3.75, 13x4 and 12X5* for 3D or APC 11X6, 11x7 and Master Airscrew S-2 series 11X7* for sport. The difference is shocking.
(* preferred prop)
If your happy with it as it is now, don't change a thing.