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I think there would be too many variables to give accurate figures for any fuel savings. However here are some figures from the Lycoming 0-320 Operators manual that might help. Engine IO-320 B & D series, mixture "Best Economy", producing 65% power at each of the following RPMs: 2000 rpm, 7.1 g/h 2200 rpm, 7.4 g/h 2400 rpm, 7.6 g/h 2600 rpm, 7.8 g/h 2700 rpm, 8 g/h The figures are taken off a small scale graph so there could be a 0.1 inaccuracy. I cruise at around 2,250 rpm & 61% power with my Hartzell. We work in litres in Australia and I suspect the C/S prop may be good for at least 1 ltr p/h (possibly more?) at cruise over a F/P prop. With fuel at around $2 AUD ltr this would be a fuel saving of at least $2,000 per 1000 hrs on current fuel prices. This is all very speculative as I have no experience with a typical F/P prop in an RV and therefore do not know the RPMs and FF that would be needed to match my TAS. No doubt there will be others with a different point of view! Fin 9A |
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