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jbhart(at)onlyinternet.ne
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 Posted: Sat Jun 27, 2009 5:19 pm Post subject: Dynamic Air Pressure Filter Housing |
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Kolbers,
This is a follow up. Before taking pressure readings, I moved the high
pressure reference point for the air fuel mixture control to a positive
dynamic pressure tap in the carburetor inlet. By doing this all air
attribute changes are common to both the low and high pressure probes, so
that when I test the scoop, it will effect both probes. Flight testing
has shown that the system works well with this arrangement.
How it was done can be seen as an update on the end of:
http://www.thirdshift.com/jack/firefly/firefly146.html
The testing is complete of the filter housing. Before testing I installed a
static pressure probe into the inside of the filter, and added a static
pressure reference probe to the nose of the FireFly. Then baseline pressure
readings were taken with the housing rotated up so that the scoop was
sensing static pressure. This was followed by successive flights where the
scoop rotated forward to 30, 60, and 90 degrees.
What I found was that the scoop rotated to straight a head can raise the
pressure inside the filter to slightly above the reference static pressure.
By doing so the engine is running as if there was no filter attached to the
carburetor. This more closely approximates test cell conditions and
resulted in a pick up of 200+ rpm at max cruise speed in level flight. I
have added a little more pitch to the propeller. Description of how it was
done can be seen on the bottom update of:
http://www.thirdshift.com/jack/firefly/firefly147.html
I am listing jumps to the my old web site as I can still upload and access
it. I am having trouble with the new one.
I am anxious to get back in the air and revisit the fuel flow study to see
if I can squeeze a little more distance out of a gallon of fuel.
Fly safe.
Jack B. Hart FF004
Winchester, IN
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sat Jun 27, 2009 5:45 pm Post subject: Dynamic Air Pressure Filter Housing |
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> I am anxious to get back in the air and revisit the fuel flow study to
see
| Quote: | if I can squeeze a little more distance out of a gallon of fuel.
Fly safe.
Jack B. Hart FF004
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How do you figure wind into your test for max distance on a gal of fuel?
Wouldn't endurance be more accurate?
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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jbhart(at)onlyinternet.ne
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| Posted: Sat Jun 27, 2009 6:13 pm Post subject: Dynamic Air Pressure Filter Housing |
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At 08:44 PM 6/27/09 -0500, you wrote:
| Quote: |
How do you figure wind into your test for max distance on a gal of fuel?
Wouldn't endurance be more accurate?
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John,
What is important is burn rate. With the air fuel mixture control, I can
run constant EGT for any cruise rpm. So far when flying over a half an
hour, the burn rates for the same EGT and rpm calculate out to with in 0.03
gph of each other. With the burn rate nailed down and calculating
endurance, I can head out to some distant point and by using my stick in
flight timer and the expected arrival time on the GPS to determine if I will
be able to make it. I learned very early to do this when I ran the Rotax
447. I flew to my EAA Chapter meetings 54 miles away. Several times I
could not make it as the head winds were too high. I had to turn around and
put the FireFly in the hangar and drive to the meetings.
When flying the FireFly to Indiana from Southeast Missouri, I had to divert
several times due to high head winds.
Jack B. Hart FF004
Winchester, IN
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herbgh(at)nctc.com
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| Posted: Sat Jun 27, 2009 7:06 pm Post subject: Dynamic Air Pressure Filter Housing |
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Jack
Nice work...might be worth a patent application? Everyone surely
appreciates the ability to hold egts constant...? Or at least dial them in...
May have asked...what is wrong with automating the jet needle to
do same? Herb
At 10:19 PM 6/27/2009, you wrote:
| Quote: |
At 08:44 PM 6/27/09 -0500, you wrote:
>
>
>
>How do you figure wind into your test for max distance on a gal of fuel?
>
>Wouldn't endurance be more accurate?
>
John,
What is important is burn rate. With the air fuel mixture control, I can
run constant EGT for any cruise rpm. So far when flying over a half an
hour, the burn rates for the same EGT and rpm calculate out to with in 0.03
gph of each other. With the burn rate nailed down and calculating
endurance, I can head out to some distant point and by using my stick in
flight timer and the expected arrival time on the GPS to determine if I will
be able to make it. I learned very early to do this when I ran the Rotax
447. I flew to my EAA Chapter meetings 54 miles away. Several times I
could not make it as the head winds were too high. I had to turn around and
put the FireFly in the hangar and drive to the meetings.
When flying the FireFly to Indiana from Southeast Missouri, I had to divert
several times due to high head winds.
Jack B. Hart FF004
Winchester, IN
Checked by AVG - www.avg.com
06/27/09 17:55:00
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sat Jun 27, 2009 7:35 pm Post subject: Dynamic Air Pressure Filter Housing |
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With the burn rate nailed down and calculating
| Quote: | >endurance, I can head out to some distant point and by using my stick in
>flight timer and the expected arrival time on the GPS to determine if I
>will
>be able to make it. I learned very early to do this when I ran the Rotax
>447. I flew to my EAA Chapter meetings 54 miles away. Several times I
>could not make it as the head winds were too high. I had to turn around
>and
>put the FireFly in the hangar and drive to the meetings.
>>
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| Quote: | >Jack B. Hart FF004
|
Jack:
I have flown cross country flights since my first one 41 years ago the same
way with the exception of the GPS, of course.
I nail down fuel burn, on a new aircraft, on my first short cross country.
That figure normally stays the same.
Since I started using GPS in 1993, I punch in my fuel burn and know, at any
time during my cross country flight, how much fuel I will arrive with. As a
minimum I like to have a one hour reserve or 5 gals. Even better, I don't
like getting below a half tank which is 12.5 gal reserve.
I'd have a hard time flying a cross country with a max of 5 gal, although I
started with the US which had 3.5 gal max. Addition of a third go cart tank
and I was up to 5.25 gal. Soon after, Kolb came up with a 6 gal main. Then
I was up to 7.75 gal. Cross country in the US was a lot of fun. Read the
map, memorize the heading, distance, and check points. Fold up the map and
sit on it until the next landing when I could take another look at it. A
little more difficult than navigating with the Garmin 196.
john h
mkIII
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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Possums
Joined: 03 Nov 2007
Posts: 247
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| Posted: Sat Jun 27, 2009 8:10 pm Post subject: Dynamic Air Pressure Filter Housing |
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A little more difficult than navigating with the Garmin 196.
I remember - but that was what you had to do to get home. BTW getting home was what got you in trouble.
We had CB's. then aircraft radios, then "the boat things (lorans) with the wires going back to our tails"
now the GPS system. Fun if you just got there.
Photo shopped of course - but like it was - fly low & don't trust anything.
| Quote: | Jack:
I have flown cross country flights since my first one 41 years ago the same way with the exception of the GPS, of course.
Cross country in the US was a lot of fun. Read the map, memorize the heading, distance, and check points. Fold up the map and sit on it until the next landing when I could take another look at it. A little more difficult than navigating with the Garmin 196.
john h |
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jbhart(at)onlyinternet.ne
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| Posted: Sun Jun 28, 2009 4:08 am Post subject: Dynamic Air Pressure Filter Housing |
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At 10:01 PM 6/27/09 -0500, you wrote:
| Quote: |
Jack
Nice work...might be worth a patent application? Everyone surely
appreciates the ability to hold egts constant...? Or at least dial them in...
May have asked...what is wrong with automating the jet needle to
do same? Herb
|
Herb,
There is nothing wrong with automating the needle. One could sense the EGT
and use a electrical feedback mechanism and a servo to adjust the needle.
The reason I didn't take this approach is that I am not good at electrical
things and I didn't like the failure mode possibilities, the weight, and the
cost.
What I have come up with is, I believe, simpler to make, costs about $50,
bullet proof, and easy to use. One has to drill two holes in the carburetor
to insert the probes, but no jets or needle has been changed.
Jack B. Hart FF004
Winchester, IN
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sun Jun 28, 2009 5:25 am Post subject: Dynamic Air Pressure Filter Housing |
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Possum:
I remember those two items. Would have had both on my Ultrastar, but could not afford the Ultrastar and the luxury of a CB and a LORAN back then. All the UL Parts Catalogs had them advertised.
It was a great adventure to be able to make it there and back home.
john h
mkIII
[quote]
I remember - but that was what you had to do to get home. BTW getting home was what got you in trouble.
We had CB's. then aircraft radios, then "the boat things (lorans) with the wires going back to our tails"
now the GPS system. Fun if you just got there.
Photo shopped of course - but like it was - fly low & don't trust anything.
[b]
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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slyck(at)frontiernet.net
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| Posted: Sun Jun 28, 2009 5:49 am Post subject: Dynamic Air Pressure Filter Housing |
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A map and a compass will do the job. -A little more work but challenging.Flying in areas like north central Ohio all the little towns look the same. It can get confusing.
I'm glad I had a windproof cabin at the time, an ultrastar would make it tough going.
BB
On 28, Jun 2009, at 9:05 AM, John Hauck wrote:
| Quote: | Possum:
I remember those two items. Would have had both on my Ultrastar, but could not afford the Ultrastar and the luxury of a CB and a LORAN back then. All the UL Parts Catalogs had them advertised.
It was a great adventure to be able to make it there and back home.
john h
mkIII
| Quote: |
I remember - but that was what you had to do to get home. BTW getting home was what got you in trouble.
We had CB's. then aircraft radios, then "the boat things (lorans) with the wires going back to our tails"
now the GPS system. Fun if you just got there.
Photo shopped of course - but like it was - fly low & don't trust anything.
http://www.matronics.com/Navigator?Kolb-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
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[quote][b]
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