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Old 05-21-2012, 02:08 AM   #1
Lewis Beachy
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Default Cherokee 235 Fuel Burn

Did my first extended cross country this weekend in my 235. I ran the power 24 squared. Fuel burn was 14.8 GPH!! Just wondering, what power settings do other people use in normal cruise? I'd like to be able to get down to 13.5 if possible.



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Old 05-21-2012, 03:43 AM   #2
Ed Dartford
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Default Re: Cherokee 235 Fuel Burn

Perhaps you noticed that your engine has six jugs instead of four. This means that it costs 50 percent more for everything including unfortuanately, gas 15gph with an O540 corresponds to 10gph for a O360, which is what just happens unless you take special care about power settings and leaning.

You can approach the fuel burn of an O360 by lowering power to what an O360 would deliver. The extra horses of the 235 are for takeoff performance, climb, and payload... not speed. Try a 60 percent power setting and see what you get.

I have heard that full power for takeoff burns at a rate of 25 gph. I would not know how to measure this, but I sure pull power back quickly.



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Old 05-21-2012, 05:41 AM   #3
Markus Vogt
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Default Re: Cherokee 235 Fuel Burn

Hi Lewis,

We normally cruise with 2200 to 2300 rpm, manifold pressure according to altitude (flight level), as we mostly fly WOT (wide open throttle). Leaned to 50F ROP (carburated engine, LOP not really possible). Fuel burn is around 48 l/h (slightly below 13 gph).
These are BTW book values.

Regards,

Markus

PS: fuel prices in Europe are actually 2,8 €/l which equals to 14 USD per gallon
Mogas is 1,8 €/l = 9 USD per gallon

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Old 05-21-2012, 01:16 PM   #4
magman
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Default Re: Cherokee 235 Fuel Burn

24/24 is simple but Performance Charts are your FRIEND.

Time spent with them is not time wasted.

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Old 05-26-2012, 02:02 PM   #5
di1630
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Default Re: Cherokee 235 Fuel Burn

I have fixed pitch prop and I run via my handbook for 55% power at cruise. Normally gets me about 120kts and 10.5 gph. Takes a lot of gas to overcome that fat wing parasite drag so for 30% more fuel I'd only get 10% more speed. Let me know if you want a copy of my chart.
Slap
N8763W

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Old 06-04-2012, 10:52 AM   #6
JoeB
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Default Re: Cherokee 235 Fuel Burn

When I owned a Dakota I ran it at 22-squared and got 128KIAS out of it (with wheel pants). Leaning via the "lean until rough, then enrich to smooth" method I'd see fuel burns around 12.5 gph.



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