I agree, Mike.
I have a good radar gun, but I've only used it a few times. This is because I have trouble finding (and asking) someone to let me fly my airplane straight at them at full throttle.
The timed distance method has worked for me, too, although I must admit I have only had one plane with which I was concerned with it's speed.......my Duellist.......and she's gone now
Oh, well. She made me realize how much I love speed!
Thanks for the help and...what is that yellow and blue delta plane of yours? Looks fast just sitting there!
Stu