Helicopter Crash in Goshen, Indiana Due to Ground Resonance

[Phrogboy]

Yeah, what he said.......

 

[ShyFlyGuy]

Thanks for the info, fellas. Makes sense, and the videos really helped visualize what happened. Kinda spookey. Is it a freak occurance, or does it happen quite regularly? I was thinking about adding rotorcraft to my blue card...


Shy

 

[pilotmiketx]

You helo guys are always blabbering about how helicopters can do all kinds of things that airplanes can't, but nobody ever mentions ground resonance, settling with power or that other trick you do when you just flip over on your side for no apparent reason.

 

[skiddriver]

Have you ever heard of an airplane doing any of those things?

 

[GravityHater]

How did Ground Resonance get its name??
I think I understand the mechanics of it but can't relate the name to the action.

 

[mattpilot]

How did Ground Resonance get its name??
I think I understand the mechanics of it but can't relate the name to the action.

Because you have to be in contact with the ground for it to happen. A corrective action for ground resonance is going into a hover.

Think of it as 4 points on the skids. The front left, front right, rear left, and rear right. The helicopter "bounces" around on those 4 points (due to unequal loading), thus shaking the helicopter pretty badly. To demonstrate, take an object, or your hand, and place it on the desk. Now think of it as a helo with the 4 points mentioned above. Only let 2 points touch the ground at the same time and "move" (wobble) the object (or hand) clockwise (or CCW) over the same spot.