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Old 03-14-2016, 01:51 AM   #1
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This is why you should never....

...ride in helicopters!



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Old 03-14-2016, 06:13 AM   #2
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.....go boating.

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I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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Old 03-15-2016, 04:30 PM   #3
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DYAMMMMM! I'm not sure I'd call that a "ride" as much as I'd call it a suicide mission.
Mike and Tina
Beachcomber 1995 Sea Ray 550 Sedan Bridge
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Old 03-15-2016, 05:52 PM   #4
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Holy Jesus ... I did not know that was a possibility.
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Old 03-15-2016, 07:15 PM   #5
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Two turbines, one transmission, two rotors, better on the ground then in the air.
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Old 03-15-2016, 08:01 PM   #6
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Whatever they used to strap it to the tarmac for that awesome "bouncification until complete failure" effect would make for great snubber material

Interesting to note the rotors didn't break apart...was that what they were testing?
"The most interesting path between two points is not a straight line" Murray Minchin
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Old 03-15-2016, 08:45 PM   #7
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This is an example of Ground Resonance.

It happens in helicopters with lead-lag hinges. It occurs only on the ground and starts when the blades "bunch up" on one side of the rotor disc where they generate an unbalanced centrifical force that gets in phase with the natural frequency of the aircraft rocking on it's landing gear. Modern helicopters avoid this by using dampers on the blades and on the gear (shock absorbed struts). It is found less on wheeled helicopters, but can still. The recovery is to lift the aircraft to a hover.

Ground resonance has not been "solved", and is still a big concern for anyone who flies a helicopter with a fully-articulated rotor system. It basically is an out-of-balance condition in the rotor system of a helicopter on the ground that rapidly increases in frequency until the helicopter shakes itself apart. It is usually caused by a hard ground contact, and is much more likely in aircraft with improperly maintained landing gear (deflated oleo struts, for example).

It cannot occur in a two bladed semi-rigid see-saw type rotor system, because the blades do not lead and lag.
M/V Boomarang
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Old 06-18-2016, 12:16 AM   #8
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Been flying helicopters since i was 17....shhh don't tell anyone...no i didn't get an actual license until i was 19....45 now and not ever seen that happen.

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