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Author a very weird helicopter landing!
Fonz
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Registered: 12th May 06
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24th Feb 12 at 12:59   View Garage View User's Profile U2U Member Reply With Quote
quote:
An investigation is trying to find out why a rescue helicopter disintegrated shortly after landing in the northern state of Para in Brazil, injuring four people on board.



as seen here: BBC News



[Edited on 24-02-2012 by Fonz]
tom130691
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24th Feb 12 at 13:06   View Garage View User's Profile U2U Member Reply With Quote
shaft balancing went tits up at a guess

doesnt explain why they or it didnt stop the engine though
Brett
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24th Feb 12 at 13:07   View Garage View User's Profile U2U Member Reply With Quote
Somethin really funny about that
Whittie
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Location: North Wales Drives: BMW, Corsa & Fiat
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24th Feb 12 at 13:11   View User's Profile U2U Member Reply With Quote
What the hell
LeeM
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24th Feb 12 at 13:12   View User's Profile U2U Member Reply With Quote
helicopters are quite unstable really, they tail rotor keeps them steady. the article mentions ground resonance which explains it really.
Nath
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24th Feb 12 at 13:12   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Brett
Somethin really funny about that


This
FAZ
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24th Feb 12 at 13:22   View Garage View User's Profile U2U Member Reply With Quote
ground resonance
FAZ
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24th Feb 12 at 13:24   View Garage View User's Profile U2U Member Reply With Quote
http://www.youtube.com/watch?v=RihcJR0zvfM

http://www.youtube.com/watch?v=D2tHA7KmRME
Brett
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24th Feb 12 at 13:26   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Nath
quote:
Originally posted by Brett
Somethin really funny about that


This

Wish it would've zoomed in on their "wtf" faces wobbling around hahaha
FAZ
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24th Feb 12 at 13:26   View Garage View User's Profile U2U Member Reply With Quote
rotational movement falls inline with earths ground resonance and in effect shakes the aircraft to bits, undercarraige design trys to combat this, it wont turn the engine off, unless something breaks (fuel line etc)

thats hw i understand it on a simple cs level
LeeM
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24th Feb 12 at 13:29   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by FAZ
rotational movement falls inline with earths ground resonance and in effect shakes the aircraft to bits, undercarraige design trys to combat this, it wont turn the engine off, unless something breaks (fuel line etc)

thats hw i understand it on a simple cs level


you thinking natural frequency?
FAZ
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24th Feb 12 at 13:30   View Garage View User's Profile U2U Member Reply With Quote
maybe

was taught it to be ground resonance, see my linked vids

or is natural frequency what the earths frequency side of the situation is called?
Nath
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24th Feb 12 at 13:32   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Brett
quote:
Originally posted by Nath
quote:
Originally posted by Brett
Somethin really funny about that


This

Wish it would've zoomed in on their "wtf" faces wobbling around hahaha


Definitely needs to be made into a GIF of some sort!
spencer88
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24th Feb 12 at 13:34   View User's Profile U2U Member Reply With Quote
I whip my chopper back and forth.
LeeM
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24th Feb 12 at 13:35   View User's Profile U2U Member Reply With Quote
natural frequency is what causes bridges to bow up and down. i think ground resonance is just the effect of the ground causing the forces in the helicopter be bounced straight back into it.
im probably completely wrong im still only first year engineering
Steve
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24th Feb 12 at 13:35   View Garage View User's Profile U2U Member Reply With Quote
they finally finished this then

http://www.youtube.com/watch?v=TQb0d7rYp9o
FAZ
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24th Feb 12 at 13:39   View Garage View User's Profile U2U Member Reply With Quote
3CorsaMeal
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24th Feb 12 at 13:54   View User's Profile U2U Member Reply With Quote
its running a DaveA coilpack iirc
Kerry
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24th Feb 12 at 14:24   View User's Profile U2U Member Reply With Quote
http://www.bbc.co.uk/news/uk-england-17128357
3CorsaMeal
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24th Feb 12 at 14:39   View User's Profile U2U Member Reply With Quote
Been watching that apache rescue on the news, the army are cool, coming out with all the gear/tools
Matty SRi
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24th Feb 12 at 14:46   View User's Profile U2U Member Reply With Quote
Wiggle wiggle wiggle wiggle wiggle yeah!
Bonney
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25th Feb 12 at 17:54   View User's Profile U2U Member Reply With Quote
Reminds me of this

http://www.youtube.com/watch?v=1TqBSI8ZBzQ

 
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