Helicopter Breaks Apart After Landing

[Garry Russell]

http://www.youtube.com/watch?v=Cf1N70szHLg

[Vancouver]

Yes that was utilising the FS2004 flight model, the FSX one is much better.

[Garry Russell]

OK but he should have had crash detection turned off

[cstorey]

Seriously, though, can anyone say what caused this ? blade fracture / whirling mode / resonance or what?

[Garry Russell]

Post #3 on this thread.

The guy there explains it...I'm not in a position to know if he's right or not.

http://www.flightsim.com/vbfs/showthrea ... omes-Apart

[Chris Trott]

Ground resonance. Here's a few other videos showing it-

http://www.youtube.com/watch?v=a4EvVR10AF0

http://www.youtube.com/watch?v=6vICf8l-KV0 (Hey, MacGuyver was good for something!)

http://www.youtube.com/watch?v=OeQTnFIfKfE

[Garry Russell]

HI Chris

The middle link is a block of script text

[Paul K]

Ground resonance. Here's a few other videos showing it-

http://www.youtube.com/watch?v=a4EvVR10AF0

http://www.youtube.com/watch?v=6vICf8l-KV0 (Hey, MacGuyver was good for something!)

http://www.youtube.com/watch?v=OeQTnFIfKfE

Good grief, those are horrible to watch !

[Garry Russell]

The Chinook is a deliberate test, so no danger there

The Swiss one looked nasty

[SkippyBing]

Not convinced the Swiss one is Ground Resonance, looks more like Dynamic Rollover, it's hard to tell with all the aircraft in the way but it looks as if he landed and then instantaneously flipped over, GR builds up over a few seconds whereas with DR the landing gear rests against something which becomes a pivot point, with disastrous consequences.

The MacGyver clip is what the Brazilian pilot should have done, basically once you've removed the ground from the equation the problem goes away (clue's in the name). Obviously if it happens on start up you can't take-off so the other option is cutting the engine and applying the brake ASAP.

Incidentally Dynamic Rollover is even harder to recover from, generally cyclic input isn't enough to stop the thing tipping over but by the time you've realised you need to lower the collective it's too late. I know of at least one occasion in the RN of a DR incident where the pilot was exonerated after it was proved it would have been impossible to react in time.