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Fuel consumption on a rotating 503  This thread currently has 225 views. Print
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texasbuzzard
July 14, 2019, 4:26pm Report to Moderator

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I have a fuel flow instrument on my 503 instead of a fuel gauge which works very well for me. I noticed on my last 2 flights that at cruise my fuel rate at 5800 rpm is 3.7 gph but if I do a shallow climb without changing the throttle the rpm drops around 200 rpm as expected but the fuel rate increases to 4.2 gph. I have determined that Rotax tunes the exhaust to 6800 rpm for best efficiency. That’s good to know.

Monte
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fiebichpv
July 15, 2019, 12:09pm Report to Moderator

A/B Plans #112 has 1008 hours as of 02-09-2015
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Did you really mean to say 6800 rpm, that is redline. I fly my 503 at 5800.

Paul Fiebich
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Stroid
July 15, 2019, 2:33pm Report to Moderator
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I just got my 503 minimax airborne. Flew an hour cruising at around 5500. Burned about 3.5gallons. Very impressed with that.
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texasbuzzard
July 15, 2019, 3:18pm Report to Moderator

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Quoted from fiebichpv
Did you really mean to say 6800 rpm, that is redline. I fly my 503 at 5800.

Paul Fiebich


my bad Paul... 5800 rpm

monte
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