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Home✈️Aircraft🚁HelicopterBlades and Night Flying › Weight VS Balance
04-24-2009 09:52 PM  10 years ago
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dasd

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Carol Stream, IL

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Weight VS Balance
I have a set of 600mm blade. The weight difference is 2 grams on a digital scale. The CG is identical. When I bolt them together and put them on a balancer, they balance perfectly. What causes this?
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04-24-2009 09:58 PM  10 years ago
psych-lick

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Portland, OR

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When you bolt them together, you may not have them 100% perfectly straight. This will cause them to rest horizontally even though they aren't perfectly in balance.

If it is possible, point them straight up and down and see which way they fall. If the fall is consistently off to one side then they are joined with a bias to that side. If they don't fall at all or fall 50/50 to the right or left then you probably have them perfectly aligned. Proceed with the weight equalization.

If the CG is matched - then add weight to the light blade over the CG.

Which balancer are you using?
-Jeff T.
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04-24-2009 10:03 PM  10 years ago
dasd

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Carol Stream, IL

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I'm using a high point balancer. I'm assuming the bolt is not affecting the balance. I used a table edge to ensure the blades are straight. So, I should be more concerned with the weight than the static balance?
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04-26-2009 02:11 PM  10 years ago
FLYINFOOL

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Cudahy, WI

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The High point balancer requires a smooth shaft to run on the wheels.
The threads of the bolt will mess you up big time.

You said that you are using a table to get the blades straight, that means that both trailing edges are in the same direction and could give you the weight bias mentioned above.

If there is a 2 gram difference in weight and the CGs are the same you should see a big imbalance on any balancer.
If the weights and CGs are the same, They should show as balanced on any balancer.

I found that even a cheap plastic balancer made fore heli blades worked better than my High Point.

FWIW
When I was using a High point for blades, the only way I could get consistent, repeatable results was to make up a dummy head and main shaft to mount the blades to.
It had the grips locked at 0 pitch.
I balanced the head separately with no blades.
I won't go into how I got the blades straight cuz I was young and immortal at the time.
Jeff Borowski
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04-30-2009 04:25 AM  10 years ago
GREYEAGLE

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Flat Land's

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Match weighted bolts
Heres mine : brought the balance of the jig in with a hand file, bit of sand paper then a touch of type writter white out

greyeagle
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