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on 2/4/03 7:13 PM, Percy Wood at [EMAIL PROTECTED] wrote: At 08:57 AM 2/4/03 -0900, Pete Thomson wrote: Good morning all, just a follow up on the CHT gauge from Wag Aero. The leads are only 4 feet long so there won't be enough of a lead to get to number 4 jug without a patch. The patches are not cheap. This is one thing, list, you Must Be Aware of. CHT and EGT meters measure wire resistance, which varies with with the heat. To get an accurate measure, you measure the resistance of Both the bi-metalic junction And the wire to the gage! Thus, "A Patch" costs so much not just for the wire, but also for the recalibration of the meter. Percy in Portland ---------------------------------------------------------- Hi Percy, If CHT and EGT units measure wire resistance, why wouldn't the "standard" lead be long enough to reach "number 4 jug without a patch"? 99% of production will go on Continentals or Lycomings, and the coupe is NOT one of the longer-nosed birds. Some owners buy a selector switch and connect multiple probes to the same gauge. It doesn't seem logical any manufacturer would not rush to correct the situation if their "standard" leads were inadequate to such obvious and intended purpose. All the probes have to have the same resistance for the single gauge...right? If you can't lengthen just one, it would seem Pete's (rhetorical) point on (unnecessary extra) cost of installation remains valid. WRB ========================== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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