Interesting Heli Vibration = Blade problem

[jwmachon]

Right guys got my governor set up on my heli today after make a 30 into a 50 raptor.

The problem is a got some 600mm blades (wood) just so i can get used to the heli and got some vibration nothing major but i got it.

I took them off and put my 600mm fibreglass blades on and heli was smooth as hell (perfect) only prob there are for another heli so cannot perm use them.

So i came home and weighed the woodies

One weighed 134.0grams and the other weighed 134.4g so 0.4g out I have now matched each blade but cannot try again tommorow as i know it is def the blades that are the prob what else could be wrong with the blades they are brand new woodies or would 0.4g make the heli vibrate a little.

Thanks,

Jonny

[trillian]

In my experience woodies almost always need to be balanced by hand first whereas carbons tend to be much closer and sometimes perfectly balanced right out of the pack.

Even a small amount of weight can cause a noticeable amount of vibration.

[pmc1972]

Hi, I am no expert but I am running woodien blades myself at mo (will upgrade after next crash) I checked my blades before I put them on, and weight wise werent too far out. But the centre of gravity was way different on along each blade. I believe this can make a difference as the mass of the blade has a different effect on the rotor head because of the mass has more leverage on one side than the other. I used the finless Bob technique of Blade balancing i.e, balance the the blades so the C of G is the same on each blade then then add wieght at the C of G point to get the same wieght, and my blades seem fine. I am sure there are people on here with more expertise and experience who can help but thought I would pass my experience of woodies.

http://video.helifreak.com/?subpath=...lancing101.wmv