AVSIG: Not a Robbie... wwswsigarch.jpg (7236 bytes)

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AVSIG Discussion Sections >> Robinson

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Ray Tackett
Top Gun


Reged: 04/30/04
Posts: 8892
Loc: Philadelphia, USA
Not a Robbie... [Re: Jeff Hartmann CIC]
      #336574 - 02/28/12 12:45 PM

In a way, it's what tore the wings off of Lockheed Electras. You get into a
vibration mode (whirl mode on the outboard engines of the Electra) where the
engine powers the oscillation until something breaks and ends the cycle.

--------------------
Ray,

Owner, Lake Wood Be Gone

Turning quality lumber into sawdust and noise since 2013.


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Anne Umphrey (KBED)
Top Gun


Reged: 04/28/04
Posts: 12756
Loc: KBED
Re: Not a Robbie... [Re: Ray Tackett]
      #336606 - 02/28/12 04:39 PM

Or they were just clueless. The statement in the write up said that it happens while the helicopter is on a level surface or words to that effect. I'll bet that when the reporter asked the expert/pilot or whomever, he said that it could happen even on a level surface if conditions were favorable. the reporter left out the "even on " part and "conditions".

Anne

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You haven't seen a tree until you've seen its shadow from the sky.
- Amelia Earhart, 1897 - 1937


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Anne Umphrey (KBED)
Top Gun


Reged: 04/28/04
Posts: 12756
Loc: KBED
Re: Not a Robbie... [Re: Jeff Hartmann CIC]
      #336607 - 02/28/12 04:45 PM

If you have the power you can lift off the ground and that will take care of the problem. But often the helicopter is slowing down and there isn't sufficient power to lift off the ground.

If you note the one in the MacGyver incident the helicopter was at full power so he just got up off the ground and everything evened out. I'll bet his heart was beating a little faster however.
Anne

--------------------
You haven't seen a tree until you've seen its shadow from the sky.
- Amelia Earhart, 1897 - 1937


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Reams Goodloe
Top Gun


Reged: 05/07/04
Posts: 2582
Loc: Kent, Washington
Re: Not a Robbie... [Re: Stephanie Belser-2]
      #347347 - 07/17/12 06:22 PM


Take a look at the Chinook test at that same YouTube location...

- Reams-


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