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  #11  
Old 11-19-2011, 08:36 AM
bkthomps bkthomps is offline
 
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Quote:
Originally Posted by DCat22 View Post
Pretty stable flight it took.

Imagining the loads on the wings and tie down points with that kind of wind though.... How do you know when the wing has been over-stressed (but not broken) from loading and restraint?
if it's above manuevering speed?
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  #12  
Old 11-19-2011, 12:02 PM
terrykohler terrykohler is offline
 
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Default Very little load on the tiedowns when the wind is at liftoff

Quote:
Originally Posted by bkthomps View Post
if it's above manuevering speed?
At the point this plane lifted off, there wouldn't have been more than a few pounds load on the tiedowns. Lift is just sufficient to overcome gravity. As the plane rotated to a higher angle of attack, the lift would have increased somewhat, but certainly not enough to cause any damage. That's suggested by the rate of climb we see in the film. You're probably correct in that no damage would occur unless wind speed were some percentage or multiple above maneuvering-depending on how design limits were established. Probably looking at a tornado/hurricane/typhoon. I'm sure an aeronautical engineer could offer a better explanation.
Terry
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  #13  
Old 11-21-2011, 03:44 PM
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Default engineering theories?

I think overstress indicators would be.......... the tie-down rings at the end of the rope....and no plane in sight!

but, really, was it a jet run-up that caused this? Man I feel for the guy, but I can't see insurance doing much for him, unless negligence of the jet could be shown?
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  #14  
Old 11-21-2011, 03:47 PM
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DCat22 DCat22 is offline
 
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Quote:
Originally Posted by flyboy1963 View Post
but, really, was it a jet run-up that caused this? Man I feel for the guy, but I can't see insurance doing much for him, unless negligence of the jet could be shown?
Or if the FBO put it there....
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  #15  
Old 11-21-2011, 04:20 PM
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N8RV N8RV is offline
 
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Default VTOL?

You're all assuming that it was the wind that did this. Perhaps Piper is working on a VTOL aircraft and this is (was) the prototype.

The vertical takeoff was excellent ... not so sure about the landing, though.
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  #16  
Old 11-21-2011, 10:07 PM
yakdriver yakdriver is offline
 
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The more I look at that video the more that looks like a model airplane. Something just doesn't look right as it lifts off.
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  #17  
Old 11-22-2011, 02:29 AM
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Quote:
Originally Posted by Bruce View Post
I thought it was Andrew at LOE.

Wrong plane though.
Close enough though...same stall speed and all. The little 12 had about all the wind she wanted there...the video certainly reminded me of LOE, watching the nose bounce up and down. Pretty scary stuff.

I am always torn as to whether or not down elevator is the way to go in a big wind? I have certainly been in some winds where I elected to taxi with at least neutral to slightly down elevator. LOE was certainly one of those. With any forward speed at all, the nose was pretty much trying to come up. Hmmmmmmm...
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  #18  
Old 11-22-2011, 09:19 AM
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keen9a keen9a is offline
 
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Quote:
Originally Posted by terrykohler View Post
At the point this plane lifted off, there wouldn't have been more than a few pounds load on the tie-downs.
Only if it is a model. If the airplane had been tied down, the load on the tie-downs will a little greater than the weight of the airplane.

bkthomps is correct that the airplane shouldn't be damaged if the wind is below maneuvering speed unless the tie-down mounting is poorly designed . . . or Airbus designed the tail, er wing.
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  #19  
Old 11-22-2011, 09:39 AM
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I can address stresses, at least from personal experience. About 20 years ago, I owned a Phantom ultralight that survived a tornado that ripped out a row of hangars at OVO. Mine was tied down in the end space, and the only plane to escape with only very minor damage. After the twister went through, it was setting there, all alone on its pad, hangar gone, with six twisted wrecks in a line beside it. Under it was the end hangar wall. That had slid under it while the UL was "airborne" by about a foot or less. The ropes were stretched to the point of being less than 3/8" in diameter (they were 1/2" before) and stiff, until you twisted them and they resumed their previous diameter. Many hours of inspection and two hour's work and I was flying again. NO stresses detected on the airframe. BTW, I still tie down in the hangar, and always will.

Bob
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  #20  
Old 11-22-2011, 10:06 AM
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Flyfalcons Flyfalcons is offline
 
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Quote:
Originally Posted by yakdriver View Post
The more I look at that video the more that looks like a model airplane.
It's an LSA, sometimes it's easy to confuse them for a toy or model.
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