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Very quiet afternoon so I went out to check fuel consumption on my C85. (Hey, test engineering is in my blood, I can't help it.) Three minute taxi and quick runup. Reset stopwatch. Cruise at 2000 rpm @ 1500 ft. for 58 minutes including coming down final really low and slowing at last few seconds. Touch down and brake 58 minutes, taxi back to fuel pump, 2 minutes. Fuel filled to bottom of tank filler both times: 3.68 gallons 100LL. Compute for 60 minutes, no compensation for 5 minutes taxi @ 700 3.807 gal. Truth is probably somewhere between 3.7 and 3.8, say 3.75, what with the 5 minute taxi and run up.
With 24 gal comes to 6.4 hours. Was getting 83 (78/88) statute at that setting GPS two directions today. Comes to 531 miles, no reserves. Hmmm veeerrry interesting. I would have thought over 4 what with the larger jets and venturi that the 85 carb has. Oh, density altitude was 1600 at 100 ft, so say about 3000 where I was cruising. Any opinions: on a cooler day would I have done better or worse. How much? Mixture is fixed rich.
Darryl
PS almost forgot. Standing there almost dark after flying and hear this awful loud screeching scraping noise and look around hangar just as a Cessna 310 is grinding to a stop with the gear up. No one hurt. Really pretty plane. What a shame. Probably a write off. Sad. I've pulled three out of the dirt or mud in the last few years, I left it in hands of the fire department, ect. this time.
With 24 gal comes to 6.4 hours. Was getting 83 (78/88) statute at that setting GPS two directions today. Comes to 531 miles, no reserves. Hmmm veeerrry interesting. I would have thought over 4 what with the larger jets and venturi that the 85 carb has. Oh, density altitude was 1600 at 100 ft, so say about 3000 where I was cruising. Any opinions: on a cooler day would I have done better or worse. How much? Mixture is fixed rich.
Darryl
PS almost forgot. Standing there almost dark after flying and hear this awful loud screeching scraping noise and look around hangar just as a Cessna 310 is grinding to a stop with the gear up. No one hurt. Really pretty plane. What a shame. Probably a write off. Sad. I've pulled three out of the dirt or mud in the last few years, I left it in hands of the fire department, ect. this time.
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