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Anyone for Ground Resonance?
Shame about the shakycam video, but talk about resonating to destruction :eek: :hmm:
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**Sigh** when will the Facebook generation learn to hold the phone horizontal to include a heck of a lot more picture.
That must have been an exciting ride for the pilot! |
Originally Posted by John Eacott
(Post 11077774)
Shame about the shakycam video, but talk about resonating to destruction :eek: :hmm:
https://youtu.be/BwYcAwv-m3w Accident info |
Could be crappy reporting, like in Oz, and the tailboom was shaken off by the resonance? The rattling around didn't do anything for the landing gear either.
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That chopper was just trying to shake off that third blade he didn't really need. :hmm:
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Call that ground resonance? This is ground resonance.
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The Chinook in the video was the victim of some Army Aeronautical Engineers who were test running the aircraft by remote control prior to shooting at it for ballistic tolerance testingl
Sadly...they chained the aircraft firmly to the ground which did not allow for the Oleo's to work as designed....and as there was no Rotor Brake on the A Model Chinooks.....there was no quick way to shut it down....thus the sad results. The thing that stands out about the AStar coming to bits is how quickly the cabin roof and forward section of the aircraft separates....confirming how weak that thing is built. |
Sassy, the story I read was that the gearboxes had been emptied of oil and this was a test to destruction to see how long they could go.
Who knows the real story? Nick? John Dixson? The Sultan?? |
AC,
You better check your sources for your information. Trust me on this this....it was a ballistics tolerance test program. http://www.chinook-helicopter.com/hi.../84-24156.html |
and as there was no Rotor Brake on the A Model Chinooks.....there was no quick way to shut it down....thus the sad results. |
Originally Posted by Ascend Charlie
(Post 11077944)
Could be crappy reporting, like in Oz, and the tailboom was shaken off by the resonance? The rattling around didn't do anything for the landing gear either.
The “spread eagle” landing gear, don’t support ground resonance either, but a hell of a hard landing… Damage of the lower vertical fin also suggest it has hit the ground hard. Have a look at the Brazilian BA that shook itself to pieces and compare. |
212man is correct.....the aircraft was being controlled remotely.....simple automation re engine controls.
Notice the rather large and high berms all round the aircraft.....and note that Aberdeen Proving Grounds is focused upon things that go bang.....Fort Eustis in Virginia is the maintenance training base....and Fort Rucker is the home to the Aviation....and now days the military facility in Huntsville, Alabama does some aviation related testing. From the Aberdeen Proving Grounds historical data.....During the period of conflict in Southeast Asia, APG reentered a period of intense growth and new direction. The recreation of the Ordnance Officer Candidate School (OCS) took place and the unusual contributions of the Land Warfare Laboratory increased. The intensive developmental efforts and scientific contributions of the Ballistic Research Laboratory, the Army Materiel Systems Analysis Activity and the Human Engineering Laboratory made the decade of the 1960s and 1970s an extraordinary time in APG's history. The Ordnance Center and School's contributions included three-shifts-a-day training at the height of the conflict. A significant change was made on July 1, 1971, when Edgewood Arsenal, the former chemical center and current chemical research and engineering center for the U.S. Army, was merged into APG. Although the mission functions remained separate entities, the real estate and base operations functions were operated as one post. From this point on, APG was the common identifier for both areas. |
SAS, your information is all I have seen re the video clip. It certainly looks like the classic 2/3P mechanical instability as it starts. Easy to criticize when ignorant of the details as to what they were doing, but taking away the wheels and gear struts, key parts of the dynamics involved, and replacing with a cable system that, just looking at the video, still allowed for aircraft motion, most likely didn’t help.
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B3 incident not ground resonance at all. Technical issue on maintenance flight and happened just North of the airport.
Post may be a little disparaging when you can see the pilot is still in the aircraft and incapacitated. Maybe it’s just a plastic Ozzy thing. Just as well the internet is a recent thing and older skeletons remain in the closet? |
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