RunRyder - My rotor head on my F3C machine is out of balance

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Aerobatic FAI F3C Contest > My rotor head on my F3C machine is out of balance

yapjy
Key Veteran
Location: Singapore

Hi,
I wasn't attentive enough and it's only recently that a fellow flier at the club pointed out that the rotor head on my Freya is not balanced.

I'm borrowing a high point balancer to work this out.

Please advise on how can I get the rotor head back into balance.

11-19-2005 Over year old.

orlee008
Veteran
Location: Miami, FL USA

make sure your flybar is equal on both sides and that its straight and true. weigh your paddles and make sure they are the exact weight. balance your rotor blades at the C.G. (Center of Gravity) then weigh the blades and make sure they weigh the same. if you have to add tape to make them weigh the same add the tape to the center of gravity of the blades. doing this will not make the C.G. go off

orlee

Flying in Miami, FL (Kendall Area)

11-19-2005 Over year old.

TMoore
rrProfessor
Location: Cookeville, TN

If you are using modern Carbon or glass blades it's simply a matter of checking the blades to confirm their state and then High Pointing the head. Usually my heads need a little touch up on the flybars due to paddle weight and relative position from the mainshaft centerline.

In the photo above you can see the wheel collars mounted on the flybar of the QUK rotor head.

TM

11-19-2005 Over year old.

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yapjy
Key Veteran
Location: Singapore

I tried to balance the rotor head using a high point balancer and to my surprise, it is balanced!

However, I do not understand why the paddles always tilt to one side even when the main blades are straighten out.

It's a FFZ-II rotorhead on a Freya.

11-23-2005 Over year old.

ErichF
Key Veteran
Location: Odessa, FL 33556 (Tampa Area)

A good head has very low friction, allowing the flybar to teeter without resistance. I encounter the same issue, if I don't have my blades pulled out exactly straight. If not, the flybar drops to one side (caused by the leading or lagging blade).

This doesn't mean your flybar is not balanced. Try this:

On a no-wind day, land your heli and let the blades stop naturally. The flybar will most likely stay level, as long as it's balanced properly.

It's nearly impossible to get the blades pulled out straight by eye-balling.

Erich

11-23-2005 Over year old.

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Aerobatic FAI F3C Contest > My rotor head on my F3C machine is out of balance

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