On 17 Apr, 01:32, Uncle Fuzzy wrote:
Holy Cow! *I hadn't checked YouTube for a while. *I'm amazed at the
speeds they're getting.http://www.youtube.com/watch?v=WaQB16ZaNI4

Thanks - astonishing. 391mph model glider that only weight
a few pounds.

I had a couple of thoughts.

1. I don't believe it - since got over that one, I do believe it now.

2. I wonder how many g they are pulling.

Does 35g seem reasonable?

From video:-

24 secs for 8 laps at say 370mph - max was 375 on that run.

close to 3 secs per lap

370mph = 165m/s

http://www.ajdesigner.com/phpcircula...n_equation.php

T is period

a = v^2 / r

r = vT / 2pi
= 165 * 3 / 2pi
= 78m

a = 165 * 165 / 78
= 349 m/s/s or 35g

This seems like quite a lot but is plausible.

I was expecting a big number since I recall
seeing a jet fighter do a reported 5g turn at
400mph ish and it took a LOT longer than
3 secs per orbit