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#18
December 23rd 03, 01:28 AM
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Drew Dalgleish wrote:
On Sun, 21 Dec 2003 17:56:56 -0500, "Ron Natalie" wrote: "PaulaJay1" wrote in message ... I got a free program that uses the engine sound to give you RPM. I don't know the web site but the program says email is . Just take a laptop to the plane and check it out. Engine sound or prop sound? How does it work on geared engines? (just kidding). Someone suggested using a street light as a strobe to check your tach. Do the math to figure out what speed will stop the prop and see if your tach agrees Drew I guess you are saying the street light flickers at 60Hz. Than a 2 bladed prop should look stopped at 1800 RPM? I might give this a try but I think this would be better for calibrating the tach neadle rather than the tach hour indicator. John Roncallo 
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