Ground Resonance - Side View

CH-47 ground test.

Category:

Autos & Vehicles

Tags:

• helicopter
• resonance

[NexIuguolo]

This is what happens when you let women drive.

[ProphetOfBaphomet]

3 blades= 120 deg separation between each

4 blades= 90 deg separation between each.

it is a balanced system. if the gap between 2 blades decreases, the the gap from them to the ofter blades increases, putting the system out of balence, which creates a violent vibrating (harmonic) effect which will mechanically shake the craft to bits.

its all about balance within the systen

[MrJonagikster]

@edintamayo electromagnetic? I think not

[TheAdmiston]

wow!!! what is that??

[papafoxtrott]

HOLY SMOKES!!!!!

[williambrodie]

@nickolastd21 This only really happens if you land in a certain way. If your rotor blades are going fast enough you take off, if not you try and slow the blades down as quickas possible. Although normally you are forbidden from using increased blade pictch (increased lift) to slow down the blades as you may accidentally take off, in this situation it can help. the movement odf the helicopter during ground resonance can be so violent that the pilot is knocked out.

[CoDViP]

Me: Thanks for letting me borrow your helicopter.

Owner: WTH!?

Me: What? That scratch was already there.....can I borrow $20 bucks?

[chrisbaker121924]

@staslig Intentionally... well sort of... its a ground test so they are trying to see the limits of what the aircraft will take... and clearly... they found it.

[chrisbaker121924]

TAKE OF THE DAMN THE HANDBRAKE!!

[coryismyfriend]

@nickolastd21 had someone actually been inside the aircraft, they could have taken it to a hover where the blades would have stabilized.

[nickolastd21]

can this happen in the air? or will it stop if they get clear of the ground?

[bigtank2185]

I talked to my friend who is a helicopter tech in the military, and he said they showed this video in ground training class, this is a demonstration to show how much vibration is in the rotors when the chinook is mounted to blocks, without the shocks and wheels, the shocks and wheels have a control system that counteract this frequency. Basically it shows what would happen if the tire pressure is off, tire pressure is most important.