On Apr 19, 4:50*pm, bod43 wrote:
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..._acceleration_...

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

I know that modern all CF molded F3B planes snap in short order.
There was a group of guys in Oregon that were on the leading edge of
RC DS'ing. They tried the above mentioned F3B model first, then
designed their own, testing it to 50G's. It folded. I would love to
know just how many G's they're pulling now.