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11-19-2011, 08:36 AM
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Join Date: Jan 2010
Location: Destin
Posts: 1,543
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Quote:
Originally Posted by DCat22
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?
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if it's above manuevering speed?
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11-19-2011, 12:02 PM
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Join Date: Jan 2005
Posts: 1,009
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Very little load on the tiedowns when the wind is at liftoff
Quote:
Originally Posted by bkthomps
if it's above manuevering speed?
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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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11-21-2011, 03:44 PM
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Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,416
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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?
__________________
Perry Y.
RV-9a - SOLD!....
Lake Country, BC
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11-21-2011, 03:47 PM
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Join Date: May 2009
Location: Houston, TX
Posts: 531
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Quote:
Originally Posted by flyboy1963
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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Or if the FBO put it there....
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-Rick Greer, VAF #2492
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11-21-2011, 04:20 PM
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Join Date: Mar 2005
Location: Elkhart, Indiana
Posts: 1,186
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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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Don McNamara
Peoria, AZ
Builder: RV-8 "Smokey"
Last edited by N8RV : 11-21-2011 at 04:31 PM.
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11-21-2011, 10:07 PM
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Join Date: Aug 2006
Location: Twin Falls, ID
Posts: 683
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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.
__________________
RV 7 N212MD Flying as of 12/22/2007
Backcountry/TCOW Super Cub flying 03/12/2011
Next project?
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11-22-2011, 02:29 AM
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Join Date: Nov 2009
Location: Fayetteville, AR
Posts: 146
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Quote:
Originally Posted by Bruce
I thought it was Andrew at LOE.
Wrong plane though.
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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...
__________________
Andrew Barker
BendixKing
TruTrak
RV-4 214NY "Carrie Ann"
RV-10 989TS
Always flying someone else's airplane too
EAA - 309420
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11-22-2011, 09:19 AM
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Join Date: Jan 2005
Location: St. Louis, MO
Posts: 242
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Quote:
Originally Posted by terrykohler
At the point this plane lifted off, there wouldn't have been more than a few pounds load on the tie-downs.
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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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11-22-2011, 09:39 AM
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Join Date: Jan 2005
Location: Near Scipio, in Southern Indiana
Posts: 1,779
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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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Bob Kelly, Scipio, Indiana
Tech Counselor
Founder, Eagle's Nest Projects
President, AviationNation, Inc
RV-9A N908BL, Flying
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11-22-2011, 10:06 AM
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Join Date: Jul 2009
Location: Bonney Lake, WA
Posts: 295
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Quote:
Originally Posted by yakdriver
The more I look at that video the more that looks like a model airplane.
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It's an LSA, sometimes it's easy to confuse them for a toy or model. 
__________________
Ryan Winslow
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