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At 05:57 PM 12/22/02 -0600, Sydney Cohen wrote: >Jan, we have the cork-and-wire guage in the header tank and, if we have 9 >gallon wing tanks, the sight guage in the left tank. If we have 7.7 >gallon wing tanks, commonly called 8 gallon tanks, we have the >cork-and-wire guage there. ...which of course do not meet the Fed's requirements of being accurate when reading 'empty' because they hit bottom and read empty when the wing tanks are about half-full (or half-empty for the pessimists). This leads to the Poly-uncertainty period. 'Poly' because the doubt is about multiple tanks, and '-uncertainty' because between the time the floats in the wing bottom out and the header starts dropping (and/or your O-200 'fuel pressure' light comes on) you are 'uncertain' about what your real fuel situation is. This period lasts for over one hour and less than two. Of course if you know how much fuel you use and are conservative you don't really care anyway, because you arrive at your fuel stop a good bit before the header tank float starts dropping, anyway. Besides, unless you're that dehydrated Frenchman, Pierre, you really wanted to pee about 15 minutes before that. Greg ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm
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