Piper Forum > General Discussion > General Piper Discussion > Cherokee 235 Fuel Burn


Reply
 
Thread Tools Display Modes
Old 05-21-2012, 02:08 AM   #1
Lewis Beachy
Junior Member
 
Join Date: Mar 2012
Posts: 3
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.


Lewis Beachy is offline  
 
Reply With Quote
Old 05-21-2012, 03:43 AM   #2
Ed Dartford
Senior Member
 
Join Date: Apr 2010
Posts: 2,938
Liked 325 Times on 264 Posts
Likes Given: 280

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.


Ed Dartford is offline  
 
Reply With Quote
Old 05-21-2012, 05:41 AM   #3
Markus Vogt
Senior Member
PiPe_LIFETIMESUPPORTER.png
 
Markus Vogt's Avatar
 
Join Date: Apr 2010
Location: EDFM, Mannheim, Germany
Posts: 153
Liked 16 Times on 10 Posts
Likes Given: 491

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
__________________
Markus Vogt, PPL(A), IR, FI(A) night,
D-EEBU, PA28-235B, based Mannheim (EDFM)
www.deebu.de
Markus Vogt is offline  
 
Reply With Quote
Old 05-21-2012, 01:16 PM   #4
magman
Senior Member
 
Join Date: Apr 2010
Location: Western New York
Posts: 1,412
Liked 200 Times on 141 Posts
Likes Given: 101

Default Re: Cherokee 235 Fuel Burn

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

Time spent with them is not time wasted.
magman is offline  
Old Jim Likes This 
Reply With Quote
Old 05-26-2012, 02:02 PM   #5
di1630
Member
 
Join Date: Apr 2010
Location: WA
Posts: 59
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
di1630 is offline  
 
Reply With Quote
Old 06-04-2012, 10:52 AM   #6
JoeB
Senior Member
 
Join Date: Feb 2011
Posts: 176
Liked 8 Times on 8 Posts

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.
__________________
Regards,
Joe

PA32-301
JoeB is offline  
 
Reply With Quote
Old 12-16-2014, 11:43 PM   #7
skyblue235
Junior Member
 
Join Date: Dec 2014
Posts: 2
Default

Will squaring damage my engine
skyblue235 is offline  
 
Reply With Quote
Old 12-16-2014, 11:45 PM   #8
skyblue235
Junior Member
 
Join Date: Dec 2014
Posts: 2
Default

You see miles of MP RPM CHARTS. IS SQUARING TOO SIMPLIFIED
skyblue235 is offline  
 
Reply With Quote
Old 12-17-2014, 12:31 AM   #9
msires
N8825W
 
Join Date: Jan 2013
Location: 15FL
Posts: 849
Liked 201 Times on 159 Posts
Likes Given: 119

Default

My 235 is fixed pitch, but I have to run it really hard to burn more than 12.5gph. I usually get around 130kts at around 12gph burn average - I don't have a fuel flow meter (yet), so I calculate fuel burn after every flight. Easy since I fill it up after every flight.

Mark
msires is offline  
 
Reply With Quote
Old 12-25-2014, 02:19 PM   #10
petercwelch
Junior Member
 
Join Date: Jun 2013
Posts: 13
Default

Aggressive leaning. If 65% power or below do not believe you can damage the engine. We get about 120 knots with about 12-12.5 GPH in our '79 Dakota.


petercwelch is offline  
 
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
cherokee 180 challenger electric fuel pump galopoli Cherokee 2 07-22-2012 01:23 PM
For Sale: Brand New Cherokee Fuel Tank Screws Charley For Sale/Wanted 1 06-24-2012 12:35 AM
Leaking fuel cap in a Cherokee 140 Vamos Cherokee 8 10-06-2011 11:21 PM
Aztec Fuel Burn Twins 6 09-18-2011 04:38 AM
Cherokee Six wing fuel gauges Bayou Boy Cherokee 3 04-27-2011 11:59 PM

This forum is provided for entertainment purposes only. Piperforum.com is not affiliated or endorsed by Piper Aircraft Inc. or its subsidiaries.

Newest Threads

LATEST SPONSOR DEALS