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Building Tips and technical articles. => 1/2 A building. => Topic started by: Dave Moritz on January 15, 2020, 04:31:30 PM
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Over on Cox Forum, Levent Suberk came up with a nifty, home-made starter for his Cox motors. I took his idea, modified it (of course!), and came up with the following. It works well.
The motor is a beefy, three-volt DC critter from some kind of hand-held vacuum cleaner. No other ratings shown on it. But I set it up for my 12-volt panel anyway, figuring that the off center mass in the coupler and the short-burst runs wouldn't allow it to over-rev or heat up. Good to go for the hard-to-start, Tee Dee-type motors under the varying temperature and humidity conditions 'round these parts.
Dave Mo...
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Hey, that's kind of cute!
You may want to use two hose clamps with the worm gears 180* apart. That way they'll cancel each other out to minimize the wobble. It may help the rubber bushing stay centered on the prop during cranking.
Have you tried it yet?
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Jim:
Thanks. Yes, my bench test indicated good operation, even with the imbalance. Am running the starter a third or half of second, just as one would expect a spring starter to operate. Shakes neither the plane nor the hand much at all.
Dave Mo...