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How To RC Helicopter Blade Balancing

Saturday, April 17, 2010

There are still some confuse about How to balance your rc helicopter blade. The rc helicopter blade must balance before we use it. When we buy for rc helicopter kit, Maybe you often find that it's already balances at the factory(i think if you luck,you will find it true) even it's new one, just make it balance. balance mean there are no tendention(which is heavier) when the blade fit at the main rotor, here we go:

Why we must balance the rc helicopter blade?

If your blades are out of balance, it will cause vibration in your helicopter which can lead to many problems including difficulty hovering or flying, loosened screws or radio frequency interference.
Give the RC helicopter more power and better performance because less energy is wasted shaking the heli.

How to balance your rc helicopter blade

We will ensue that the blade are statically(matches the weight of each blade to the other) and dynamically balanced. Here we go:
How To Balance Your Blades Dynamically

Place your round shaft on a flat surface
Place one rotor blade at the top edge of the round shaft, balancing it with your fingers Slide the blade back and forth until you find its balancing spot (also know as the center of gravity).
Now mark that spot with a pencil and don't move the blade as you mark it.
Do this with the second blade as well.
Now, match up the blades by laying them on top of each other.
Move the top blade enough to see where the balancing point is for it and compare the two points.
If they're more than 1mm apart, you need to change the balancing point on the blade that has it's center of gravity closest to the blade tip, by transferring the balancing point closer to the bolt hole. You can do this by adding small strips of tape near the bolt hole until the center of gravity points match on both blades.
Repeat this until you have applied enough tape to make the necessary correction to match the center of gravity (balancing point) of both blades and you're done!

How To Balance Your Blades Statically

Take a nut and bolt and attach the blades together and set them symmetrically apart like they would be in flight.
Hang the rotor blades from your thread. You can do this with a wing nut or simply put the thread between the top blade and the nut before you tighten them together. Just make sure that the thread is lined up with the center of the blades or you've just wasted your time. You can also center the ends of the bold between two objects of equal height (like a 2 by 4) to balance them.
Pick up the blades by the thread and let them hang naturally. Look at them at eye-level to see if they're level or if one rotor blade is lower than the other. If they're level, then job well done! If they're not level, then we need to fix it by adding small strips of tape to the blade that is higher (it means it's lighter).