Peter,
The lights flicker at twice line frequency.
Dave Simpson
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> From: Peter S. Lert <peterlert@montrose.net>
> Cc: europa@avnet.co.uk
> Subject: Re: taco error
> Date: 17 October 1998 19:46
>
> There's a quick and quite accurate way of getting at least a few
> accurate tach check points. I've only used in here in the States on
> direct drive engines, but with a bit of calculation it should work
> anywhere:
>
> 1.) Figure out, based on the gear reduction ratio of your engine, the
> engine RPMs at which the prop turns a multiple or submultiple of 60
> times per second (here in the States) or 50 times per second elsewhere.
> E.G. for Europe, 2500 _prop_ rpm, 1250 rpm, etc.
>
> 2. Park the airplane, at night, on a ramp illuminated by mercury or
> sodium vapor lamps. Failing that, and with the possible ire of your
> neighbors, in your driveway with the garage door open and fluorescent
> (_not_ incandescent) lights on.
>
> 3.) These lights flicker at line freq. If your tach is correct, a prop
> blade will appear to "freeze" at or near the correct rpm.
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