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Weights on BO-105 / BK-117 blades?


2rst1
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Hi,

 

Just came across this picture of a BK-117's MR hub, and i'm wondering what the purose is for the weights hanging on the blade? Anyone that knows :blink: ?

 

Attached is the picture of the BK-117 MR hub & blade root:

 

2rst1

post-3851-1158520012_thumb.jpg

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Lots of heads have weights on them. They're for vibration damping, in all cases I know of. The B412 ended up with almost 300 lb of weight up there, because it couldn't be tracked satisfactorily without it. The S76A series has weights, in a different configuration. The B206 has weights, but they don't move the same way.

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You will find weights on most main and tail rotor systems. They act like the weights that mount on your car tires to reduce vibes!

Just wait until you sling a weight and put it through the hangar walls! That was fun!

 

Who picked up the bill for that :D ?

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