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Thread: McCulloch Drone Engine

  1. #1
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    McCulloch Drone Engine

    Saw this for sale on e-bay:

    McCulloch Drone Engine - eBay (item 290501949200 end time Nov-30-10 14:00:00 PST)=

    Don't know anything about it, just happened across it.

    Richard

  2. #2
    Registered User Dan Thomas's Avatar
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    Re: McCulloch Drone Engine

    Quote Originally Posted by Richard6 View Post
    Saw this for sale on e-bay:

    McCulloch Drone Engine - eBay (item 290501949200 end time Nov-30-10 14:00:00 PST)=

    Don't know anything about it, just happened across it.

    Richard

    There were several models built, but a popular one among the gyrocopter guys of the '60s and '70s was the 72-hp version. I once bought a homebuilt (fixed-wing) that had one on it, and it had been derated to about 50 hp by shimming the cylinder bases to reduce the compression and lowering the RPM by using a larger prop. Still, it shook the airplane so much that it broke glue joints in the firewall. It's a two-stroke and two cylinders fire together, and half a revolution later the other tow fire. Makes for a really rough engine.

    They were designed and built to power military target drones for antiaircraft gunners to shoot down. One source told me they were intended to have a 15-minute service life. Problems encountered by homebuilders included a magneto that would overheat and quit (and it is single ignition) and the carburetor, which would shake to pieces from the vibration. Some guys were able to fix up some of these hassles, but the engine is not at home in most applications. It's designed to produce 72 hp at 6000 RPM and to fly a tiny drone around at terrific speeds for a few minutes, radio-controlled, and if something quits no one gets hurt. Here's one:


    And a Bensen gyro with one on it:


    Dan

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