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Old 12-17-2009, 03:35 AM
Mike G's Avatar
Mike G Mike G is offline
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Default Quarter turn V belt pre rotator

Cleaning up the files in my computer I came across this drawing that I did of an idea I had many years ago when I was dreaming about gyros and full of bright ideas that this forum often then showed me didn't work or had already been tried.
Does anybody know if this has ever been done?

Mike G
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File Type: pdf quarter turn V belt drive.pdf (45.5 KB, 290 views)
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Old 12-17-2009, 04:15 AM
Simon Simon is offline
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Hi Mike,

An evolution of this system is the Metro launch on the Butterfly:

Very clever, because of it's ability to move the rotorhead about and keeping
the tension on the belt (a multi-V or flat one in this case I think)

You'll probably remember the Peugeot 305, that had the alternator "around the corner"
of the engine, the same way as in your drawing, with a V-belt in that case.

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Old 12-17-2009, 05:55 AM
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RotoPlane RotoPlane is offline
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Yes it will work….as long as the distance between the idler pulleys and the driver/driven pulleys is great enough to prevent belt rollover, and the idler pulleys are above and below the belt crossover pulley centerline enough to prevent belt rubbing. Of course the belt life is reduced somewhat, but it is an inexpensive way to reverse direction of the driven pulley.
Ed Rosenberger
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Old 12-17-2009, 05:58 AM
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Chuck Roberg Chuck Roberg is offline
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Mike. Looks like the pre-rotor on a KB-3 to me.
Chuck Roberg
Naperville, IL
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Old 12-17-2009, 05:59 AM
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Mike G Mike G is offline
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As I said Simon "there's nothing new under the sun" it's all been done before.
The Butterfly method is even better than mine because my idea would still need a vertical drive shaft up to the rotor and I doubt if there was enough space in my design to get al those twists in shuch a short length of V belt.
Mike G
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