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Fuel situation
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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Thu Mar 18, 2010 4:58 pm    Post subject: Fuel situation Reply with quote

Yesterday, when flying with 5 gallons (plus) of fuel in each
tank....just added the fuel before the flight....I noticed that the
clear tygon vent hose up to the right wing-tank was void of fuel.
This has happened to me before, and it usually means I haven't been
paying attention and I ran low on fuel. I usually just bank to the
left a bit, and pull back on the stick a bit, and head for the
nearest fuel supply. But this time it was different.....the fuel
wasn't filling the clear vent line like I have seen on *numerous*
occasions. And I couldn't see a high fuel reading in the sight gauge
on the right tank, which I should be able to see given that I was
banking left. When I looked at the left tank sight gauge, it showed a
very high fuel reading, which was strange because banking left should
cause that side to read low. Well, I was only 13 minutes from home,
and the low fuel warning light hadn't come on yet, so I knew I had
enough fuel to make it home even if it did....the header tank holding
at least 15 minutes worth of fuel after that light comes on in my
system. I first thought that I had forgotten to replace the cap on
the right tank, but trying to pull myself up by the "grab bars" in
the cabin wouldn't allow me to see the caps, so I gave up on that idea.

Well, I made it with room to spare, and got out and saw the LEFT tank
cap was gone....I found it on the take-off point on the runway. I had
become distracted talking to a farmer who was visiting, and forgot
that cap when I had added the fuel. What I surmised happened was that
the air being forced into the right cap pressure tube/vent had forced
the fuel out of the fuel outlet, down and through the header tank,
and up into the left-side fuel tank, which, with no gas cap, had no
air pressure acting on it from above, ( and in fact probably had a
partial vacuum acting on it) so it was an easy matter for the fuel
from the right-side tank to be pushed into it. I also imagined that
if I had filled both tanks, and left the cap off one, that for a
while air passing over the open tank might siphon fuel out,
especially with a constant feed from the other tank. Probably the
fuel would siphon only for a short time, because eventually the fuel
level would drop to a point where the siphon would be broken and fuel
would no longer be lifted by the air passing over the big hole.

After pushing the plane back into the hangar, to its' level resting
spot, I closed both down valves, and looked into the tanks. The left
tank showed full within about 1-1/2" from the top, and the right one
showed nearly bone empty. About an hour later, after opening both
down valves, the tank levels had evened out, and the sight gauges
showed about 5 gallons in each tank. These sight gauges are only
accurate at flight level, so the actual reading was not accurate, but
the comparison between the tank levels was.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 880.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~120 to go(128 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)


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Lynn
Kitfox IV-Jabiru 2200
N369LM
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Fox5flyer
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PostPosted: Thu Mar 18, 2010 5:57 pm    Post subject: Fuel situation Reply with quote

Good report, Lynn. Similar situation happened to me, however I replaced the
cap, but didn't get both tangs locked under the lip which caused what
happened to you. Don't feel bad though. It's happened to many others here
on this list. Some have actually lost their cap in flight, never to be
found again.
It became one of my "check it twice" items.
Thanks for sharing.
Deke

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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Fri Mar 19, 2010 2:21 am    Post subject: Fuel situation Reply with quote

You know what's strange about it....I was telling my neighbor about
it, and he wondered why the fuel in the left tank didn't just spew
out the open hole when I was banking the plane left to get the fuel
to flow to the left rear corner of the right tank. The only thing I
can think of is that the air blowing over the open hole sort of
"sheared" over the hole and maybe prevented the.....what I would
think would be...gushing of the fuel out of that open hole.

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 880.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~120 to go(128 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
On Mar 18, 2010, at 9:16 PM, fox5flyer wrote:

Quote:

<fox5flyer(at)idealwifi.net>

Good report, Lynn. Similar situation happened to me, however I
replaced the cap, but didn't get both tangs locked under the lip
which caused what happened to you. Don't feel bad though. It's
happened to many others here on this list. Some have actually lost
their cap in flight, never to be found again.
It became one of my "check it twice" items.
Thanks for sharing.
Deke


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Lynn
Kitfox IV-Jabiru 2200
N369LM
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7suds(at)Chartermi.net
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PostPosted: Fri Mar 19, 2010 3:46 am    Post subject: Fuel situation Reply with quote

Lynn,
Could it be that you were in a coordinated 1 G turn and the same centrifugal
force that keep you centered in your seat kept the fuel in the bottom of the
tank?

Lloyd C
Northern Mi
Mod 5 912ul IVO IFA

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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Fri Mar 19, 2010 4:51 am    Post subject: Fuel situation Reply with quote

My flight instructor would doubt that I'm EVER coordinated, Lloyd,
but you might have a point. However, I wasn't turning, just going
straight, so it doesn't seem like that would apply, but I could be
wrong.
I certainly didn't lose much fuel, as that flight lasted 0.8 hours,
and involved two take-offs and landings. After assessing the
situation on the ground afterwards, I was amazed at how much fuel was
transferred to the left tank, and how much there was left, totally,
between the two tanks after the settling/leveling period.

The scientist in me wants to try it again with an observer plane, but
my skivvies aren't back from the laundry yet. : )

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 880.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~120 to go(128 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
On Mar 19, 2010, at 7:26 AM, Cudnohufsky's wrote:

[quote]
<7suds(at)chartermi.net>

Lynn,
Could it be that you were in a coordinated 1 G turn and the same
centrifugal
force that keep you centered in your seat kept the fuel in the
bottom of the
tank?

Lloyd C
Northern Mi
Mod 5 912ul IVO IFA

--


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Lynn
Kitfox IV-Jabiru 2200
N369LM
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Dick Maddux



Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl

PostPosted: Fri Mar 19, 2010 5:50 am    Post subject: Fuel situation Reply with quote

Lynn,
You bring up a good point ....distraction. By talking with the farmer you lost your train of thought and forgot to fasten the gas cap (lucky you found it) I did a similar thing.
A friend of mine was talking to me when I had just replaced my spark plugs and buttoning up the cowl. I taxied out to go flying and during the runup had a bad mag check. I taxied back, removed the cowl, and there it was ! I had reversed the #3 and #4 top spark plug wires.
I guess the moral of this story is if you are going to talk,finish what you were doing first or stop working,talk and then resume when the distraction is gone.
    Dick Maddux
        Fox 4
        Milton,Fl
[quote][b]


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PostPosted: Fri Mar 19, 2010 7:32 am    Post subject: Fuel situation Reply with quote

I too have experienced this, but with full fuel and a partially positioned
fuel cap like Deke describes. I think in the leg we flew - a flight of six
up from the Desert Fox fly-in years ago - I lost a full tank of fuel.

One further thought. I agree with Lynn about the reading of the sight guage
not being accurate in level flight and on the ground. I made a very
accurate card marking fuel gallons at both three point and in level flight.
At some point, the readings became the same. I don't recall the details as
that airplane is gone, but as I recall it was somwhere about mid capacity
that the geometry of the tank compensated for the tank angle.

Lowell

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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Fri Mar 19, 2010 8:37 am    Post subject: Fuel situation Reply with quote

Your point is good too, Dick....don't forget where you left off after
the distraction is gone. Jabiru came out with a bulletin on how to
torque the prop flange, after a guy answered he phone during doing
just that task. The bulletin said "Once you start this job, do not
answer the phone or otherwise get distracted until the job is finished."

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 880.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~120 to go(128 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
On Mar 19, 2010, at 9:44 AM, Catz631(at)aol.com wrote:

Quote:
Lynn,
You bring up a good point ....distraction. By talking with the
farmer you lost your train of thought and forgot to fasten the gas
cap (lucky you found it) I did a similar thing.
A friend of mine was talking to me when I had just replaced my
spark plugs and buttoning up the cowl. I taxied out to go flying
and during the runup had a bad mag check. I taxied back, removed
the cowl, and there it was ! I had reversed the #3 and #4 top spark
plug wires.
I guess the moral of this story is if you are going to talk,finish
what you were doing first or stop working,talk and then resume when
the distraction is gone.
Dick Maddux
Fox 4
Milton,Fl
www.matronics.com/contribution _-
============================================================


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Lynn
Kitfox IV-Jabiru 2200
N369LM
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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Fri Mar 19, 2010 9:02 am    Post subject: Fuel situation Reply with quote

I've seen that too, Lowell. With a certain amount of fuel onboard,
the tail-low reading will be faulty in the low direction. Level the
plane up and presto....you have more fuel than you thought. I've left
the ground with the readings on both tanks in the "red"...."no take-
off" zone. Took off anyway, or level the tail dragger, and the sight
gauges will show 4-5 gallons.

Which brings up a question.....somewhere in "How to fly a Kitfox" it
says something to the effect of "do not make long descents with a low
fuel situation in the Kitfox" and I'll be damned if I can find it
again, after I read it. (This point was driven home to me last year
going into Oshkosh, when my engine quit 20 feet after pulling off the
runway. Two minutes later, enough fuel had drizzled into the header
tank to start the engine, and taxi a half-mile to Homebuilt camping.)

I'd appreciate it anybody could find that warning, and let me know
what page it is on.

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 880.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~120 to go(128 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
On Mar 19, 2010, at 11:30 AM, Lowell Fitt wrote:

[quote]
<lcfitt(at)sbcglobal.net>

I too have experienced this, but with full fuel and a partially
positioned fuel cap like Deke describes. I think in the leg we
flew - a flight of six up from the Desert Fox fly-in years ago - I
lost a full tank of fuel.

One further thought. I agree with Lynn about the reading of the
sight guage not being accurate in level flight and on the ground.
I made a very accurate card marking fuel gallons at both three
point and in level flight. At some point, the readings became the
same. I don't recall the details as that airplane is gone, but as
I recall it was somwhere about mid capacity that the geometry of
the tank compensated for the tank angle.

Lowell

---


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Lynn
Kitfox IV-Jabiru 2200
N369LM
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Tom Jones



Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

PostPosted: Fri Mar 19, 2010 10:07 am    Post subject: Re: Fuel situation Reply with quote

Lynn Matteson asked:
Quote:
Which brings up a question.....somewhere in "How to fly a Kitfox" it
says something to the effect of "do not make long descents with a low
fuel situation in the Kitfox" and I'll be damned if I can find it
again, after I read it. (This point was driven home to me last year
going into Oshkosh, when my engine quit 20 feet after pulling off the
runway. Two minutes later, enough fuel had drizzled into the header
tank to start the engine, and taxi a half-mile to Homebuilt camping.)

I'd appreciate it anybody could find that warning, and let me know
what page it is on.


Managment of the fuel during descents is discussed near the end of this Service letter.
http://www.kitfoxaircraft.com/support/service_letters/sl45.htm


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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA
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Tom Jones



Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

PostPosted: Fri Mar 19, 2010 12:52 pm    Post subject: Re: Fuel situation Reply with quote

Page 176

"4. Avoid prolonged, steep descents if only minimal unusable fuel remains in tanks."

There are some things that I have read that can't be found now too.

I read in Discovery magazine a while back that every time we pull a memory out of our memory bank we have to re-remember it when we put it back in the memory bank. Each time we do this we change it a little bit, then after awhile the memory can change significantly from what actually happened. I think that's what it said anyhow if I remember it correctly.


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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA
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Tom Jones



Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

PostPosted: Fri Mar 19, 2010 12:57 pm    Post subject: Re: Fuel situation Reply with quote

I think your last post and mine collided in cyberspace and it knocked mine into a time warp. It is posted an hour before I wrote it. do not archive.

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503 Rotax, 72 inch Two blade Warp
Ellensburg, WA
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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Fri Mar 19, 2010 1:30 pm    Post subject: Fuel situation Reply with quote

Thanks for pointing me in that direction, Tom.....good reading, but
not really what I was looking for. I was specifically looking for the
passage in the book "Kitfox pilot's Guide" by Earl S. Downs, and not
in "How to fly a Kitfox", as I previously requested (gettin' old is
hell). I own this book, and I saw that passage just a week or so ago,
and can't for the life of me find it again. I was hoping that someone
who has the book might have earmarked that page and could jump right
to it....and save me having to go through the book page by page
*again* just to find it. I know the drill by heart by now,
(descending in "stair-steps") having been through this same scenario
again and again....I just want to see *that* passage in *that* book
again...maybe just to prove to myself that I wasn't just imagining
things.

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 880.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~120 to go(128 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
do not archive

On Mar 19, 2010, at 2:07 PM, Tom Jones wrote:

Quote:


Lynn mattison asked:

> Which brings up a question.....somewhere in "How to fly a Kitfox" it
> says something to the effect of "do not make long descents with a low
> fuel situation in the Kitfox" and I'll be damned if I can find it
> again, after I read it. (This point was driven home to me last year
> going into Oshkosh, when my engine quit 20 feet after pulling off the
> runway. Two minutes later, enough fuel had drizzled into the header
> tank to start the engine, and taxi a half-mile to Homebuilt camping.)
>
> I'd appreciate it anybody could find that warning, and let me know
> what page it is on.
Managment of the fuel during descents is discussed near the end of
this Service letter.
http://www.kitfoxaircraft.com/support/service_letters/sl45.htm

--------
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA


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Lynn
Kitfox IV-Jabiru 2200
N369LM
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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Fri Mar 19, 2010 1:43 pm    Post subject: Fuel situation Reply with quote

Call off the dogs.....I found the passage I was looking for.....page
195 of "(The) Kitfox Pilot's Guide" continued onto p.196, under the
heading "Descent" item #4 "Avoid prolonged, steep descents if only
minimal useable fuel remains in tanks."

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 880.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~120 to go(128 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
do not archive


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Lynn
Kitfox IV-Jabiru 2200
N369LM
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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Fri Mar 19, 2010 2:23 pm    Post subject: Fuel situation Reply with quote

Just for fun, Tom, re-check that page number....it's 196 in my book,
and is your clock set right (daylight savings time) on your computer?
A swell prize is being offered to the guy who posted it first, and I
think I won. : )

I could've sworn I saw that "Avoid...." in a body of text somewhere
in the book, but this was probably what I saw, and like Discovery
mentioned, I might have "changed it a little bit". It is this
changing of facts that prevents me from giving away good books when
I've read them....I always need to re-check some facts after time has
passed. : (

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 880.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~120 to go(128 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
do not archive

On Mar 19, 2010, at 4:53 PM, Tom Jones wrote:

Quote:


Page 176

"4. Avoid prolonged, steep descents if only minimal unusable fuel
remains in tanks."

There are some things that I have read that can't be found now too.

I read in Discovery magazine a while back that every time we pull a
memory out of our memory bank we have to re-remember it when we put
it back in the memory bank. Each time we do this we change it a
little bit, then after awhile the memory can change significantly
from what actually happened. I think that's what it said anyhow if
I remember it correctly.

--------
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA


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http://forums.matronics.com/viewtopic.php?p=290964#290964




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Lynn
Kitfox IV-Jabiru 2200
N369LM
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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Fri Mar 19, 2010 2:32 pm    Post subject: Fuel situation Reply with quote

And your reply got here before my comment did.....maybe Guy and Mike
are holding it for ransom. : ) do not archive

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 880.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~120 to go(128 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
do not archive

On Mar 19, 2010, at 4:57 PM, Tom Jones wrote:

Quote:


I think your last post and mine collided in cyberspace and it
knocked mine into a time warp. It is posted an hour before I wrote
it. do not archive.

--------
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA


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http://forums.matronics.com/viewtopic.php?p=290965#290965




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Float Flyr



Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

PostPosted: Sat Mar 20, 2010 5:46 am    Post subject: Fuel situation Reply with quote

I always thought for steep descents the engine should be at the idle to keep
it fairly rich. That way there would be no prolonged descents. Generally
for an enroute decent I just pull back the throttle and keep a little nose
high attitude.

Noel

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Noel Loveys
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Fox5flyer
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PostPosted: Sat Mar 20, 2010 6:42 am    Post subject: Fuel situation Reply with quote

My thoughts on long descents are, if air cooled, keep some power on to avoid
shock cooling, especially in cold air. Liquid cooled isn't so much of a
problem.
Opinions may vary.
Deke Morisse
Mikado Michigan
S5/Subaru/CAP 439+ TT
Previously Model 2 582 400 Hrs
"If you put the federal government in charge of the Sahara
Desert, in five years there'd be a shortage of sand."
-- Nobel prize-winning economist Milton Friedman (1912-2006)


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lcfitt(at)sbcglobal.net
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PostPosted: Sat Mar 20, 2010 8:45 am    Post subject: Fuel situation Reply with quote

This is one of the things I think of during the aircooled vs. liquid cooled
debates. Sometimes simpler is not simpler. It reminds me of the times we
dropped down the canyon to land at Orofino - Point the nose at the river and
watch the airspeed. I have tested the fuel flow on a 30 min descent from
14,000 ft. to my pattern - 2000 ft. and if on the final six gallons each
tank, the tanks will definitely unport and the engine will feed from the
header tank. It is an easy task to level a bit and get things flowing
again. This, of course, with the early aft feeding wing tanks. I like the
clear vent lines and the glass fuel filters between the wing tanks and the
header tankl I was able to watch all this unfold.

Lowell
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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Sat Mar 20, 2010 11:48 am    Post subject: Fuel situation Reply with quote

Clear vent line and glass (Purolator see-through) filters is how I
observe my fuel low at low-fuel situations. When I had the incident
that started this thread, I flew within about a mile of my home field
at about 4000 AGL, then lost altitude at the rate of about 2000 fpm,
turned into the pattern and landed...piece of cake.....all without
the low-fuel warning light coming on. It's just a matter of "knowing
thine own airplane" as AVweb's John Deakin (Pelican's Perch) might say.

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 881.5 hrs (since 3-27-2006)
Countdown to 1000 hrs~119 to go(126 days to go)
Sensenich 62"x46" Wood (summer)
Sensenich 55.5" x 46" Wood (winter)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying (and learning)
On Mar 20, 2010, at 12:44 PM, Lowell Fitt wrote:

[quote]
<lcfitt(at)sbcglobal.net>

This is one of the things I think of during the aircooled vs.
liquid cooled debates. Sometimes simpler is not simpler. It
reminds me of the times we dropped down the canyon to land at
Orofino - Point the nose at the river and watch the airspeed. I
have tested the fuel flow on a 30 min descent from 14,000 ft. to my
pattern - 2000 ft. and if on the final six gallons each tank, the
tanks will definitely unport and the engine will feed from the
header tank. It is an easy task to level a bit and get things
flowing again. This, of course, with the early aft feeding wing
tanks. I like the clear vent lines and the glass fuel filters
between the wing tanks and the header tankl I was able to watch
all this unfold.

Lowell
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Kitfox IV-Jabiru 2200
N369LM
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