Scratch-built Counter-Rotating Helicopter

Aug 21, 2012 2 Comments by

IRCHA also brings some interesting self-designed projects to marvel over. This is Jim Ryan from Cincinnati, OH with his counter rotating and inter meshing prototype helicopter. Jim not only designed this helicopter, but also made all the CNC parts, including the gears. He’s using a Spektrum receiver with Beast X and Digi-Mix 3 for control and stabilization. Notice the 5° coning angle on each rotorhead for proper clearance as one rotor disk intersects the other. So far Jim has four test flights and is looking forward to mounting a suitable fuselage. (For more IRCHA news and photos, click here!)

Paul Tradelius

About the author

A regular contributor to Model Airplane News, he is also the columnist for our “Rotor Speed” helicopter column. Paul has been flying RC helicopters since the early ‘80s and now enjoys all types of rotary machines, including scale and aerobatics, and he continues to experiment with modifications to improve performance.

2 Responses to “Scratch-built Counter-Rotating Helicopter”

  1. Drew says:

    Very nicely done.

    Were you able to get close up pictures of the Russian full size one to see how they did it regarding rotor timing?

    Please put up some videos of it in the air. It’s nice to see someone doing something outside the box.

  2. Jim Ryan says:

    Hi Drew,

    Thanks for your kind remarks about my project. Actually, this isn’t a Russian design (the Kamov helis are coaxial). This will be a Kaman HH-43B Huskie, a rescue heli that saw service in the early days of Vietnam.

    I’ll post video as soon as I complete a few revisions.

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