at what RPM does the tacho time run at 1=1 hour?
Krazy, the only way you will know is to check the particular tachos part number and look up the manufacturers specs. For example see,
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BTW, loved your other thread. All the best for the future.
Super Cecil, you need to get out more.
Aircraft were called planes long before your father was a glint in his fathers eye.
Well in 1920 at least, which is the furtherest back I've bothered to research.