speed
I have always thought we were doing straight and level flight. Thats what i was doing. I got to about 180 with my nelson q40 on straight and level flight but i think ran out of thrust as you mentioned. That prop was under 7.2 inch diameter. I put a nelson q500 on it and put the q40 on the whiplash extreme which is over a pound lighter. I still have jett 50 and jett 60 and jett q500 to try. Hope to try them all.