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Given that the ASI measures pressure through its barometric capsule can
anyone give me the formula that will translate knots or MPH into pressure
expressed in inches of water.  I have a manometer and would like to
calibrate a pressure switch to close when the speed drops to 90mph.  I
intend to use it as a gear warning. I have the switch, which was used in
another LNC 2 and it is calibrateable.  I may have to readjust it but would
like to get it in the right ball park.

Regards

Ian Crowe.

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