'Fools beguiled by platitudes.'

[birdy]

It drops, Mr. Bird, because you’re using height to provide acceleration in order to gain velocity.
Duh.
I didnt get a chance to play with the vd today.
The wind was too strong n gusty to hold a desent virtical.
Not that the f^%$# moos gave me a seconds grace.
8 frign hours, flatout.
I thought drout strickn moos were supposed to be slow..er.
Duno wot they are eatn out there, but i recon i could use sum.

 

[Harry_S.]

Well Harry, at least you?re still here. Had you encountered a fog bank instead and tried to stay right side up in forward flight, you more than likely wouldn?t.

No argument there, Chuck.


Cheers

 

[Harry_S.]

What Harry experienced was a backside of the power situation where it was sinking in pretty fast at wide-open throttle but still halfway flying.

We all like to embellish our stories. When I put one down in the Gulf of Mexico, it seemed like I was underwater for 10 minutes until things stopped churning but common sense dictates that it probably wasn?t more than 20 seconds.

Nope,

No Chuck, no embellishment nor exaggeration in my post, nor was I on the backside of the power curve...in fact, I had no stinkin' power curve...the MAC had died, shut down...reread my post. No power and I was about 500 ft. from the end of the strip as well. When I cleared that road, I think I could have counted the rrpm...if I had time to...it wasn't much, believe me!!

I was being a bit conservative in my estimated bounce after impact. I really believe it may have been more than 6 ft.?!

I understand your comment about the rigidity of the 2X2 tubing and that I probably only bounced about 2 ft., but, I was flying my Bensen B7, with the ROUND tubing. Maybe you can compute or comment on the reflex or recoil of the square vs the round tubing, coupled with the tire pressure and impact velocity?!


Cheers

 

[C. Beaty]

Do you remember Superballs, Harry? They would almost bounce back to the height from which they’d been dropped. Rubber normally has a fair amount of internal friction (hysteresis), so doesn’t return all the energy it has been given. I think Superballs were wound with a rubber thread under tension, making them something special.

If you can bounce higher than drop height, you have a new kind of perpetual motion machine.

Equivalent drop height Vs rate of descent:

2000 fpm……………………17.36 ft
1500 fpm…………..…………9.76 ft
1000 fpm…………………… 4.34 ft

Edit: Wrong again. Super Balls were made from a synthetic rubber, vulcanized under high pressure.

http://www.ideafinder.com/history/inventions/superball.htm

 

[chuter]

I had a few super balls; hours of fun.

I doubt if they'd even be noticed today. Now, they might make a video game where you could simulate playing with a super ball.

The article mentioned black eyes from errant bounces; I bet the liability lawyers wouldn't even let it get to market.

 

[Harry_S.]

Platitudinizing?!

Platitudinizing?!

I request a comment on 2x2" square tubing vs round tubing and I get somethin' about Superballs. Wassup?! :noidea:


Cheers

 

[C. Beaty]

It takes more to bend a 2 x 2 square tube than to bend a 2” round tube, all else equal.

But Harry, if you can bounce higher than your drop height, that excess energy could be harnessed to generate electricity.

 

[magilla]

Hoo boy. I had the misfortune of being (in my thin days) a 225lb jumper, and I got my 5 jumps and the blood wings to prove it.

The problem is, the darned -1B chutes were built for 175lb fellas, and I sank like a box of rocks. Last one out, first one down... The first time I almost pulled my reserve because I was falling faster than everyone else....I looked up to check my chute, and I could see everyone else's boots wayyyyyy up there.

I knocked the wind out of myself four out of five jumps, and I did PERFECT parachute landing falls.

The fifth one was interesting... I was going backwards in a T-10, and reached up to grab an armful of risers, and grabbed the rear instead of the front. Landed damned near horizontal going backwards...Funnily enough, I didn't knock teh wind out of myself, but my head throbbed for two days.

So, 17fpm or 22fpm or whatever it was, from personal experience I can tell you the heavier you are the HARDER you land. Same goes, i would imagine, for a heavy gyro with shorter rotor blades...

Ugh - gives me willies remembering it. We jumped all five times in one day, and brother, let me tell you, four times having the wind knocked out of you and a light concussion to end the joy with wasn't my idea of "fun," Especially with the jumpmaster yelling at me to get my ass up off the floor and run back in...

Don't know about you, but I would not like to land at 22fpm with my butt on a seat tank.