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Eugene Zimmerman
Joined: 10 Jan 2006 Posts: 392
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Posted: Mon Jul 23, 2007 5:15 pm Post subject: Fuel Efficiency ? was Re: Small Cross Country |
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Mike,
Cool Pict !
Your 15.27 mpg works out to a fuel burn of -
4.25 gal. per hr. (at) 65 mph
3.9 gal. per hr. (at) 60 mph
3.6 gal. per hr. (at) 55 mph
Does this sound about right with your experience?
I'm interested in finding out what others are experiencing in fuel
efficiency.
On Jul 23, 2007, at 6:20 PM, planecrazzzy wrote:
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planecrazzzy Guest
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Posted: Tue Jul 24, 2007 1:05 pm Post subject: Re: Fuel Efficiency ? was Re: Small Cross Country |
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Yep , your numbers look REAL close....
and I might add that I'm pretty "Happy" with them.....
.
.
Gotta Fly...
Mike & "Jaz" in MN
.
.
.
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jbhart(at)onlyinternet.ne Guest
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Posted: Tue Jul 24, 2007 4:19 pm Post subject: Fuel Efficiency ? was Re: Small Cross Country |
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At 09:14 PM 7/23/07 -0400, you wrote:
Quote: | I'm interested in finding out what others are experiencing in fuel
efficiency.
|
Eugene,
I have a FireFly with a Simonini Victor 1+ mounted. I had never taken any
data above 5,600 rpm because it is uncomfortable to cruise at any rpm higher
than that. I have not been able to achieve the Simonini published fuel flow
rates at 5,600 or lower. You can see my efforts to lean the engine out on
the bottom of:
http://www.thirdshift.com/jack/firefly/firefly121.html
Last Saturday morning was my EAA Chapter 373 meeting, and I was a little
late getting off. For the first time, I let the engine cruise at 6,000 rpm.
I climbed to 2,870 feet asl to reach 55 degree F air to be sure that
coolant temperatures would stay within specs. Ground to ground flight time
was 54 minutes and total fuel burn was 1.90 gallons for an overall fuel burn
of 2.11 gph. Distance between airports is 23 miles and assuming an
additional mile for pattern distance, the total distance traveled was 48
miles. This gives 25.3 mpg. 2.11 gph at 6,000 rpm agrees with Simonini's
published data for the Victor 1+.
I have two EGT probes mounted. The second is mounted down stream from the
first by about six inches. When running the engine at 5,500 rpm the down
stream EGT probe will normally run 100 degrees higher than the engine
mounted probe. This is pretty constant down to about 4,500 rpm. But when I
cruised at 6,000 rpm the down stream probe read 400 degrees higher. Now
that I have had time to think about it, I believe what happened is the
engine was running up on the pipe. I believe the engine is falling off the
pipe tuning if it is run at 5,500 rpm. I will be making some more runs at
5,900, 5,800 etc. rpm to see what happens. If this is the case, I can
lengthen the pipe or inject water to try an get better fuel economy at 5,500
rpm.
Several years ago, I took some ground data on the Rotax 447 while injecting
water, and I found that it did reduce fuel flow. It would be interesting to
try this while flying to see what happens. If you would like to see this
data, it can be seen at:
http://www.thirdshift.com/jack/firefly/firefly58c.html
Always more to do.
Jack B. Hart FF004
Winchester, IN
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lucien
Joined: 03 Jun 2007 Posts: 721 Location: santa fe, NM
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Posted: Tue Jul 24, 2007 6:13 pm Post subject: Re: Fuel Efficiency ? was Re: Small Cross Country |
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Eugene Zimmerman wrote: | Mike,
Cool Pict !
Your 15.27 mpg works out to a fuel burn of -
4.25 gal. per hr. (at) 65 mph
3.9 gal. per hr. (at) 60 mph
3.6 gal. per hr. (at) 55 mph
Does this sound about right with your experience?
I'm interested in finding out what others are experiencing in fuel
efficiency.
|
My stats:
FS II 98' model
503 DCDI 2v, 3.47:1 C box w/clutch
Warp drive 68" 3 blade
empty weight 440lbs.
Fuel burn at sea level at about 60mph was around 3gph. At my new altitude of 7000', it's slightly less than that just eyeballing it. Probably around 2.8gph...
LS
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_________________ LS
Titan II SS |
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Eugene Zimmerman
Joined: 10 Jan 2006 Posts: 392
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Posted: Tue Jul 24, 2007 6:59 pm Post subject: Fuel Efficiency ? was Re: Small Cross Country |
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Jack,
Thanks for sharing your fuel efficiency data.
Your fuel burn is very close to what I have been able achieve. Your
ground speed comes out to approximately 53.3 mph.
Each aircraft has a specific airspeed at which it flies most
efficient. To maximize fuel efficiency the engine's maximum fuel
efficiency must coincide with the aircraft's most efficient air speed.
The most efficient airspeed for my modified Firestar II is slightly
less than 50 mph and varies slightly with air temperature and fuel load.
I burn 2 gal. per hr. at 50 mph cruise (at) 4000 rpm. My engine is a
Rotax 618 which has the variable exhaust valves and is turning a 72"
IVO in-flight adjustable prop at maximum pitch.
In this configuration my plane and engine are quietly loafing along,
but (at) 6600 rpm full throttle the 618 is a thirsty beast and according
to my fuel flow gauge, can drink over 8 gal. per hr.
Gene
On Jul 24, 2007, at 8:46 PM, Jack B. Hart wrote:
Quote: |
<jbhart(at)onlyinternet.net>
At 09:14 PM 7/23/07 -0400, you wrote:
>
> <etzim62(at)earthlink.net>
> I'm interested in finding out what others are experiencing in fuel
> efficiency.
Eugene,
I have a FireFly with a Simonini Victor 1+ mounted. I had never
taken any
data above 5,600 rpm because it is uncomfortable to cruise at any
rpm higher
than that. I have not been able to achieve the Simonini published
fuel flow
rates at 5,600 or lower. You can see my efforts to lean the engine
out on
the bottom of:
http://www.thirdshift.com/jack/firefly/firefly121.html
Last Saturday morning was my EAA Chapter 373 meeting, and I was a
little
late getting off. For the first time, I let the engine cruise at
6,000 rpm.
I climbed to 2,870 feet asl to reach 55 degree F air to be sure that
coolant temperatures would stay within specs. Ground to ground
flight time
was 54 minutes and total fuel burn was 1.90 gallons for an overall
fuel burn
of 2.11 gph. Distance between airports is 23 miles and assuming an
additional mile for pattern distance, the total distance traveled
was 48
miles. This gives 25.3 mpg. 2.11 gph at 6,000 rpm agrees with
Simonini's
published data for the Victor 1+.
I have two EGT probes mounted. The second is mounted down stream
from the
first by about six inches. When running the engine at 5,500 rpm
the down
stream EGT probe will normally run 100 degrees higher than the engine
mounted probe. This is pretty constant down to about 4,500 rpm.
But when I
cruised at 6,000 rpm the down stream probe read 400 degrees
higher. Now
that I have had time to think about it, I believe what happened is the
engine was running up on the pipe. I believe the engine is falling
off the
pipe tuning if it is run at 5,500 rpm. I will be making some more
runs at
5,900, 5,800 etc. rpm to see what happens. If this is the case, I can
lengthen the pipe or inject water to try an get better fuel economy
at 5,500
rpm.
Several years ago, I took some ground data on the Rotax 447 while
injecting
water, and I found that it did reduce fuel flow. It would be
interesting to
try this while flying to see what happens. If you would like to
see this
data, it can be seen at:
http://www.thirdshift.com/jack/firefly/firefly58c.html
Always more to do.
Jack B. Hart FF004
Winchester, IN
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