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From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [FlyRotary] electric vacuum pump - a way unscientific
 science experiment
To: flyrotary
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Date: Tue, 03 Jun 2003 08:54:37 -0400
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Posted for "Ian Beadle" <ianb@ozzienet.net>:

> Rats, I'm thinking electric gyros now.

  Marko,
Electric instuments are noisy, unreliable and expensive.
An ordinary aircraft vac. pump can be modified to be driven by a 10mm
internal toothed timing belt by removing the shear coupling and adding two
push fit ball bearing races. The pump can be driven at a lower speed than in
the Lycoming by selecting the appropriate cogs and driving from the water
pump pulley. For aircraft use smaller a smaller crank pulley than standard.
Ian Beadle
RV6A Rotary.