RE: how can you prove it woos?
Dan;
There are 4 good ways.
1, Two men, two stopwatches, and a long measuring tape. (works ok).
2, Doppler method using an audio recording device of some type.
(works good when operated correctly)
3, GPS attached to the aircraft. Garmin Geko-201 works super and
it's safe and light.
4, Stalker sports radar gun. Its super but not as safe as the others
cause your looking down the nose of a 200 MPH plane to get accurate
speeds.
All methods have been talked about at length on this forum.....
Syd Clement