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RC helicopter balancing, tracking, setup and tips
For RC helicopters models run completely smooth, you have to pay attention to make it balanced. Main Blade Balancing, Blade Tracking, Tail Blade Balancing, Flybar Balance, Paddle Pitch, Straight Main Shaft, Straight Feathering Shaft - they are the way to stop vibration and fly better, like a new heli.Align Trex 250.
Blade Balancing
As shown above, use the balancer to determine which blade is heaver - mark this blade in some manner.
Place the heavy blade on the forks of the balance and shift it one way or the other until it remains horizontal. Mark the point on the rotor blade at which the blade balance indicator points (this is the CG point).
Place the rotor blades side by side and mark the CG point on the lighter blade.
Place the lighter blade on the balance with the indicator in line with the marked CG point. Apply film to the lighter end until the rotor blade balances horizontally.
Mount both blades on the balancer and apply tape to the lighter blade AT THE CG POINT ONLY.
Dinamic Balance
Force exerted by the mass of an object (eg blade) about a pivot point (eg feathering shaft) is Span Moment Arm. It is calculated by multiplying Mass of the object by the distance the Center of Gravity is from the pivot point. It is generally measured in inchlbs (typical US/Imperial units).
SPAN Moment Arm of Blade A = Da x Wa.
The purpose of Static Chord adjustment is to balance the blade in the chord wise direction. If the CG is located aft of ideal, the rotor blade would tend to climb since the turning moment that the aft located CG would produce would tend to make the nose climb.
If the CG is forward of the ideal CG, the turning force created by the blade mass distribution about the chord would be a nose down tendency, making the blade dive.
Blade Tracking
You need to mark one blade on its leading edge with a highly visible color. Colored tape such as electrical insulating tape is good, as is a good size blob of colored ink from something like a paint pen or marker pen. The important thing is that you can easily identify one blade from the other when they're spinning.
Holding the helicopter at arms length, or getting someone to hold it, fire up the main rotors so that they are at 'flight-speed' - anywhere between half and full power is good.
Look at the blades straight-on at eye level, and you'll see one of two things... either you will see just one blade profile, or you will see two at different heights. If the latter is the case, then the blades are tracking badly and need to be adjusted.
Why do the blades track differently?
If the angle of attack, or pitch angle, of one blade is slightly different to the other, then that blade will generate a different amount of lift to the other one. If this is the case, the two blades will follow a slightly different path through the air, the blade with the greater angle of attack flying higher.
Badly tracking blades can cause vibration in the same way that unbalanced blades do, and they can also cause instability in flight.
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