>>The highest speed of a model aircraft (i.e. not an UAV built by professionals) about which I have heard so far has been flown at
>>571 km/h = 355 mph. See http://www.hessenbruch.de/niels/ (in German).

I work with GPS all the time, at work, and there is no way you can use a GPS like that in a turn to measure
top speed.. It only samples once a sec and any fast vertical movements will just mess it up
even more.

There is no doute that is a fast plane, maybe the fastest, but top speed off a Garmin is
not a good indication of anything..

Eddie Weeks