2rst1 Posted September 17, 2006 Posted September 17, 2006 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 ? Attached is the picture of the BK-117 MR hub & blade root: 2rst1 Quote
delorean Posted September 17, 2006 Posted September 17, 2006 That's how you tell a boy BK from a girl BK....... Quote
Elvis Posted September 17, 2006 Posted September 17, 2006 They help reduce vibration as you go through translation Quote
AndrewT Posted September 17, 2006 Posted September 17, 2006 That's how you tell a boy BK from a girl BK....... I like that explanation better Quote
2rst1 Posted September 18, 2006 Author Posted September 18, 2006 I like that explanation better Yup Quote
jimbo2181 Posted September 18, 2006 Posted September 18, 2006 They help reduce a vibrations that occur during low speed flight and leveling off after a dive that are only present on that rotor head for some reason. Quote
Gomer Pylot Posted September 18, 2006 Posted September 18, 2006 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. Quote
Nuke Posted September 18, 2006 Posted September 18, 2006 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! Quote
2rst1 Posted September 18, 2006 Author Posted September 18, 2006 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 ? Quote
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