a typical trainer with an os .46 ax and 11x7 hits a max of 75mph leveling out after dive with a tailwind. realistic max full throttle speed is more like 45-50. (I've flown various gps's in planes, so I can't get the actual speed during a dive, but it is relatively close when leveling out.)

gauging the speed of rc planes is TOUGH to do without actually measuring it, especially when you watch the larger planes fly, they seem to be barely moving when in fact they are usually quite fast.