Car manufacturer's solved this problem decades ago. When did you last see a car fuel gauge that quotes litres or gallons (US or Imp). They simply have a needle traversing a linearly calibrated (OK I know they LOOK round) scale from E(mpty) to F(ull) via different graduations acording to the maker. Regardless of the shape of the tank(s) the needle (generally, there are some exceptions) sweeps the scale in proportion to the amount of fuel burned.
HOW HARD CAN IT BE TO APPLY THIS TECHNOLOGY TO AEROPLANES!!!
My Auster has a rotating scale fuel gauge similar to that fitted to a Champ. As long as you remember it under-reads by 3 Imp Gallons on the ground and 2 Imp Gallons in the air, it is extremely accurate for an instrument manufactured in 1946. It is accurate to the gallon as I have verified at the pumps many times.
Last edited by LowNSlow; 6th Sep 2003 at 13:04.