Helicopter Ground Resonance

Excellent example of *what to do* if entering into ground resonance. The Gazelle pilot immediately lifts his helicopter off the ground. Incident occured during taping of a "MacGyver" episode (Deathlock (1986)). I happened to catch this scenario while watching the episode. They left the footage in the opening sequence, even with passenger door flapping!

Category:

Entertainment

Tags:

• Helicopter
• Ground
• Resonance

[NorwalkPost]

The corrective action is to jump out of the helicopter and RUN as fast as you can, screaming like a terrified girl all the way.

[micikas]

@NorwalkPost Agreed. Best place to do it is on a high building so you can backflip off of it and land soft on a bus.

[jgdogg441]

@upajos Actually my good friend you would be wrong. As per this video /watch?v=RihcJR0zvfM cutting power and setting her down wont help a thing as the wheels/struts are trying to hold the helicopter still (friction) while the rest of the body is trying to shake itself loose. Also of note in the video I reference, the safety restraints are in fact slack to allow as much free movement as possible while still maintaining safety.

[thedoorsbiggestfan]

thats Bonaventure hotel in LA

[upajos]

The alternative is to cut power and set the aircraft down firmly on the landing gear. Power from the engine is what drives the resonance to higher levels.

[glock21guy]

@pilotguitar21 Thought the same thing at first but then realized too that those people may never even have been in the heli. It was probably just filmed flying in while the people were waiting on the steps for the shot.

[pilotguitar21]

hmm....are we sure that this is ground resonance? looks like the heli has been idling long enough for the people to get out...ground resonance happens if there is a hard landing and shockwaves are sent from the skids and into the blades causing the blades to become out of phase with each other...looks like not the case here...looks more like harmonic resonance....he's idling at that range at which the main rotor and tail rotor and harmonizing with each other...making it worse and worse. maybe?

[Felipethug2010]

Saiu com a porta aberta.

kkk

[PIRINEOS12]

As far as I know in this event you have two options:1) If the rotor RPM are "high" you lift the heli (in the video case) 2 )If the RPM are low you turn off the motor .. Am I correct?.Good video.I guess the shoot was too expensive to repeat it ;)

[kellertv]

jettison the doors and pop the floats never fails.....

[jerrodcorey25]

JET RANGER SOUND EFFECTS = FAIL

[zeetek007]

Good thing the pilot knew what to do.