blade tracking (each blade flying through the same space)Ĭommercial equipment for doing this ranges from $2000 (cheapest I've seen) to tens of thousands of dollars. weight of each blade (can change as paint abrades off)ģ. Helicopter blades typically have several variables that need adjusting from time to time to keep the rotor smooth:Ģ. I've just completed the design of a hand-held dynamic balancer for helicopter rotors and airplane propellers, that uses accelerometers, photo-tach sensors, and Fourier transform algorythms to iteratively measure amplitude and phase angle of the imbalance, and suggest the corrective action. Balancing the "large diameter fan" on helicopters is periodically required and crucial for system longevity, not to mention occupant comfort.Īside from my interest in amateur machining, I'm a rated helicopter pilot, and electrical engineer.
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