Originally Posted by
UStik
You didn't specify the prop pitch. at that weight, I'd expect about 65 mph flying speed and would shoot for 80 mph pitch speed, but by prop pitch and not by cell count.
Its a 16X12 4 blade prop, at current 8s its Pitch Speed is 59.5mph - 54 pounds of thrust, I have decide to go with the 9s set up, for 60 pounds of thrust and around 64.5 Pitch Speed, this will really help with my jato rocket take off in a 55-65 pound plane. Im still concerned about the low 64.5 pitch speed, I don't want to be flying full power just to keep her in the air.