How in the world did you get your LT-40 up to 116? Clip the wings? Streamline the fuselage? Put on a thin fully symmetrical wing on? Use a 91FX? Dive straight down from 1000 ft at full throttle?

Most flat bottom wing trainers' top speeds are heavily drag limited. I had a TT 46 Pro in my Avistar which designwise is probably capable of a little more speed than the LT-40 and I'd say at level flight, it'd pull 65-70mph using a 10x7 prop... I put the same motor on my cleaner Dragon Lady (fully symmetrical low wing) and that plane may just hit 85mph. And my very clean P-51D with retracts may top out at 95-100 or so mph with the gears up... Me thinks that you need the to gets that radar gun calibrated