Re: Callibrating Engine RPM

[Miles McCallum <milesm@avnet.co.uk>]

I haved used an item that was fairly common in the States (sorry -haven't
got a name or address, but should be findable via Trade-A-Plane) that
resembles a jews harp: Twang it, and look at the prop through a viewhole. I
can't remember if it was settable, or if  the prop appeared stationary at
one rpm, but I do remember that it was pretty accurate -I tested one against
a very expensive optical tach.

Miles