"kirk.stant" wrote in message
oups.com...

Plus, 20 seconds is an eternity when it comes to getting out of the
way.

I asked this question several times, and never saw a convincing answer:
exactly how do you use even the 20 seconds if you have them to avoid
something coming at you at 300 (or, it was suggested, possibly much more)
knots? If you start in a thermalling glider at minimum sink speed, you can't
seem to run fast enough far enough given the rate of closure -- and the lack
of time to estimate relative motion precisely enough. We don't have
targeting radars in most of the gliders (not sure about Space Shuttle
though).
--
Yuliy