Today's Message Index:
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1. 01:56 AM - Re: Re: Kolb/Jabiru carb overflow ()
2. 03:56 AM - Re: Re: Kolb/Jabiru carb overflow (Ron @ KFHU)
3. 06:23 AM - Re: Re: Kolb/Jabiru carb overflow (John Hauck)
4. 06:59 AM - Re: zenair floats plans. (Ellery Batchelder Jr)
5. 07:09 AM - Re: Re: Kolb/Jabiru carb overflow (Jack B. Hart)
6. 07:49 AM - Re: Re: Kolb/Jabiru carb overflow (frank goodnight)
7. 10:14 AM - Re: Kolb/Jabiru carb overflow (Jason Omelchuck)
8. 11:11 AM - Re: Re: Kolb/Jabiru carb overflow (robert bean)
9. 11:28 AM - Pitot static port location (Mike Welch)
10. 11:50 AM - Re: Pitot static port location (John Hauck)
11. 12:42 PM - Re: Pitot static port location (Mike Welch)
12. 12:54 PM - Re: Re: Kolb/Jabiru carb overflow (b young)
13. 01:08 PM - Re: Pitot static port location (b young)
14. 01:44 PM - Re: Pitot static port location (Mike Welch)
15. 03:36 PM - Re: zenair floats plans. (Malcolm Brubaker)
16. 03:40 PM - Re: Pitot static port location (Richard Girard)
17. 06:36 PM - Re: Re: Kolb/Jabiru carb overflow (zeprep251@aol.com)
18. 06:46 PM - Re: Pitot static port location (Mike Welch)
19. 07:05 PM - Re: Pitot static port location (John Hauck)
20. 07:49 PM - Re: Pitot static port location (b d)
21. 07:59 PM - Re: Kolb/Jabiru carb overflow (ces308)
22. 08:57 PM - Re: Kolb/Jabiru carb overflow (ces308)
23. 09:06 PM - Re: Pitot static port location (Mike Welch)
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Subject: | Re: Kolb/Jabiru carb overflow |
ARE YOUR TANKS VENTING CORRECTLY?
Message 2
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From: | "Ron @ KFHU" <captainron1@cox.net> |
Subject: | Re: Kolb/Jabiru carb overflow |
Is there supposed to be a fuel return line or something like that, that may be
plugged up? I am trying to remember from the Mikuni iirc on the Cuyana I flew
last year. But it had a pulse pump and very little pressure I guess. Why is yours
flooding is not making any sense.
It may not be flooding at all. and in fact it may be too lean. I would check and
make sure there are no cracks in the fuel lines. I had to put down the Pterodactyl
on my maiden flight next to a MacDonald restaurant because of a crack in
the fuel primer pump nipple. It displayed the symptoms of too rich, poor throttle
response and chocking at full throttle, and it progressively got worse till
I could not maintain altitude.
Check all of your lines for cracks anything from the fuel tank to the Carb.
Message 3
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Subject: | Re: Kolb/Jabiru carb overflow |
I hope so...cause I'm going nutts !!!! LOL
chris ambrose
Chris A/Folks:
If it was mine, I would have already replaced the fuel pump with a new
serviceable pump. Not worth the chance of getting hurt and/or ruining your
airplane being a test pilot.
How much does a new pump cost?
Of course, as I age I am not nearly as bold as I used to be. ;-)
john h
mkIII
hauck's holler
Titus, Alabama
Message 4
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Subject: | Re: zenair floats plans. |
My Grosse weight is 1250 I would probably sink them
Ellery Batchelder Jr.
-----Original Message-----
From: Malcolm Brubaker <brubakermal@yahoo.com>
Sent: Fri, Jan 14, 2011 7:46 pm
Subject: Re: Kolb-List: zenair floats plans.
$2000 firm on the price they are prety nice floats i lost all my pics onth
e computer so no build pics but i could take some of them they are wraped
in
phome and suran hanging in my hanger they are 12 ft long 950 displaceme
nt w one rutter no rigging
Malcolm Brubaker
Michigan Sport
Pilot Repair
LSRM-A, PPC, WS
(989)513-3022
From: "elleryweld@aol.com" <elleryweld@aol.com>
Sent: Wed, January 12, 2011 7:04:50 PM
Subject: RE: Kolb-List: zenair floats plans.
-----Original Message-----
From: "Malcolm Brubaker" <brubakermal@yahoo.com>
Subject: Kolb-List: zenair floats plans.
several years aho i sold a set of plans for the zenair floats to a Kolber
can anyone rember buying a set? i lost my copy and need another mal
Malcolm Brubaker
Michigan Sport
Pilot Repair
LSRM-A, PPC, WS
(989)513-3022
malcolm i am the one that got the plans for the floats from you i will see
about getting a copy made up i will let you know when i have that done i
think i remember where i last had them
________________________________
From: "elleryweld@aol.com" <elleryweld@aol.com>
Sent: Wed, January 12, 2011 7:43:44 AM
Subject: RE: Kolb-List: Air foil for cable...
would it reduce drag on a cable if you was to fold a peice of vinal tape
in half
to leave a 3/4 inch trailing edge? let the testing begin
-----Original Message-----
From: "Nick Cassara" <nickc@mtaonline.net>
Subject: Kolb-List: Air foil for cable...
Kolber's,
A year or two ago someone posted drag values for parts of a Kolb, if I
remember right. I was amazed at the drag values for the cables on the p;
-Matt Drall===========
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Message 5
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Subject: | Re: Kolb/Jabiru carb overflow |
At 10:25 PM 1/14/11 -0800, you wrote:
>
>Hello all..
...........................>
>
>What I think is happening is when we cut it off it just took longer for the
fuel to build up pressure and once everything was full of gas,the spring was
still working and although it wasn't going up as far, when it did push up,it
was still pushing at 7# psi...we only shortened the spring...not relieve any
tension......do you see what I mean??? does it make any sense??? I hope
so...cause I'm going nutts !!!! LOL
>
Chris,
The force (F) exerted by the fuel pump spring is equal to the change in
spring length (L) times the spring constant (K). Or F = L x K. L is
predetermined by the cam lobe in the engine. The spring constant is
determined by type of material and diameter of the spring wire.
So you are correct when you do not see any change due to cutting the spring.
You did not change the pump stroke or the wire spring constant. The only
way to reduce pump stroke (L) is to add gasket material to the point that
the cam follower does not remain in contact with the cam. The only other
option is to replace the spring with one that is the same physical size but
wound from smaller diameter wire thereby reducing the spring constant (K).
If your new silver spring does not do the job, and pressure remains too
high, purchase a new spring that is close to the same length and outside
diameter, but with smaller diameter wire. Springs can be purchased over the
web and in some cases from your local hardware store.
Jack B. Hart FF004
Winchester, IN
Message 6
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Subject: | Re: Kolb/Jabiru carb overflow |
Hi , never having seen your fuel pump or the spring that controls the presu
re , =0Ai'd like to hazzard=0Aa guess. Hopefully if I' wrong some of the mo
re knoweledgabe folks on- the the =0Alist can correct=0Ame before any dam
age is done.-I have always thought that if a spring was made =0Ashorter (
cut ) that=0Awould make-the spring-stiffer ---easy to check, just cut a
n old spring and see =0Awhat happens---.=0ALooks to me like that would rais
e the fuel presure, could be you need a longer =0A(stretched ?)sprnig=0Aor
one with thiner wire.=0AFrank Goodnight-=0A=0A=0A=0A=0A=0A=0A____________
____________________=0AFrom: Jack B. Hart <jbhart@onlyinternet.net>=0ATo: k
olb-list@matronics.com=0ASent: Sat, January 15, 2011 9:08:06 AM=0ASubject:
Re: Kolb-List: Re: Kolb/Jabiru carb overflow=0A=0A--> Kolb-List message pos
ted by: "Jack B. Hart" <jbhart@onlyinternet.net>=0A=0AAt 10:25 PM 1/14/11 -
.com>=0A>=0A>Hello all..=0A...........................>=0A> =0A>What I thin
k is happening is when we cut it off it just took longer for the =0Afuel to
build up pressure and once everything was full of gas,the spring was =0Ast
ill working and although it wasn't going up as far, when it did push up,it
=0Awas still pushing at 7# psi...we only shortened the spring...not relieve
any =0Atension......do you see what I mean???- does it make any sense???
- I hope =0Aso...cause I'm going nutts !!!!- LOL=0A>=0A=0AChris,=0A=0AT
he force (F) exerted by the fuel pump spring is equal to the change in =0As
pring length (L) times the spring constant (K).- Or F = L x K.- L is
=0Apredetermined by the cam lobe in the engine.- The spring constant is
=0Adetermined by type of material and diameter of the spring wire.=0A=0ASo
you are correct when you do not see any change due to cutting the spring.
=0AYou did not change the pump stroke or the wire spring constant.- The o
nly =0Away to reduce pump stroke (L) is to add gasket material to the point
that =0Athe cam follower does not remain in contact with the cam.- The o
nly other =0Aoption is to replace the spring with one that is the same phys
ical size but =0Awound from smaller diameter wire thereby reducing the spri
ng constant (K).=0A=0AIf your new silver spring does not do the job, and pr
essure remains too =0Ahigh, purchase a new spring that is close to the same
length and outside =0Adiameter, but with smaller diameter wire.- Springs
can be purchased over the =0Aweb and in some cases from your local hardwar
- - - - - - - - - - - - - - - -Matt Dralle, L
=======
Message 7
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Subject: | Re: Kolb/Jabiru carb overflow |
ces308 wrote:
>
> Frank is sending me his NEW silver spring which is supposed to be 2-3 lbs...if
that does not work I will put a regulator on and set it to 2-3 lbs..
> Again..Thank you Frank !
>
> chris ambrose
> M3X/Jabiru A-2200 172.0hrs
> N327CS
Hello Chris,
Be careful that the fuel pressure regulator you use does not restrict flow. I
put one of those round silver types with a dial on my airplane and at extended
high power settings it would not allow enough fuel to flow. It caused an engine
out on my first flight in my MKIII.
Regards
Jason
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327117#327117
Message 8
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Subject: | Re: Kolb/Jabiru carb overflow |
As one who has had experience with those "round silver" regulators.......
They are not all created equal. The one from NAPA will work. Others can be junk
even though they appear similar.
I recommend simply using the lowest pressure output facet from AC spruce with no
regulator.
Why? because if the diaphragm in the regulator fails, it fails closed.
BB
MKIII, suzuki
On 15, Jan 2011, at 1:11 PM, Jason Omelchuck wrote:
>
>
> ces308 wrote:
>>
>> Frank is sending me his NEW silver spring which is supposed to be 2-3 lbs...if
that does not work I will put a regulator on and set it to 2-3 lbs..
>> Again..Thank you Frank !
>>
>> chris ambrose
>> M3X/Jabiru A-2200 172.0hrs
>> N327CS
>
>
> Hello Chris,
>
> Be careful that the fuel pressure regulator you use does not restrict flow.
I put one of those round silver types with a dial on my airplane and at extended
high power settings it would not allow enough fuel to flow. It caused an engine
out on my first flight in my MKIII.
>
> Regards
> Jason
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=327117#327117
>
>
>
>
>
>
>
>
>
>
Message 9
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Subject: | Pitot static port location |
Guys,
I'm VERY close to being able to permanently install my front instrument panel/console.
I have already installed the overhead panel. Next will be the task
of hooking up the various sending units, loose wires, etc., the stuff you can't
do until the panel gets installed into the plane. As far as all the wires
between the two panels is concerned, this is simply a matter of plugging together
two DB15 plugs.
As many of you may recall, I recently installed my airspeed indicator pitot (under
the front edge of the nosecone).
Yesterday, I made the static pitot fitting (for the unpressurized static source)
Here's my question; Do any of you have a recommended place on the nosecone
for the static pitot fitting? Or is it okay to locate it ANYWHERE on the side
of the nosecone? The inlet hole for the static air is a drilled hole about
.025 dia. (It is TINY!!!!!, just slightly larger around than a pin)
Here is a second question! To make sure that the exterior fitting doesn't get
either higher or lower pressure than static, would it be a good idea to drill
an EXTRA hole into one of the interior static line "T's? (the static line
supplies air to 3 instruments)
By drilling an extra hole into an interior T, I would be allowing for BOTH static
air inside and outside of the cabin.
I know you are not supposed to rely ONLY on inside static air, because it is
possible that the inside cabin MAY have slightly higher or lower static air, due
to cabin design.
Anyone have some training on the pitot system, and at this point, the static
part of it?
Thanks for any advice,
Mike Welch
MkIII
Message 10
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Subject: | Re: Pitot static port location |
Anyone have some training on the pitot system, and at this point, the
static part of it?
Thanks for any advice,
Mike Welch
Mike W/Gang:
I have no training on the the pitot/static system, only practical experience
that works for me.
If I was going to use a system similar to yours, I would use a static port
on each side of the nose cone, combine these two ports into a T fitting,
then into your instruments. By doing this, you eliminate the pressurization
or vacuum of a single port when the aircraft is not quite in yaw trim, one
side or the other.
Once flying, the static ports can be calibrated by taking a tiny bit of
material off the aft side of each static port, if they are pressurizing, or
off the forward side of the hole if it is creating a vacuum.
The reason I settled on this system for my Firestar is because I tried it
single first, then found it to be a more workable solution with two ports.
BTW: I used 1/16" ID ports.
john h
mkIII
hauck's holler
Titus, Alabama
Message 11
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Subject: | Pitot static port location |
> If I was going to use a system similar to yours=2C I would use a static p
ort
> on each side of the nose cone=2C combine these two ports into a T fitting
=2C
> then into your instruments. By doing this=2C you eliminate the pressuriza
tion
> or vacuum of a single port when the aircraft is not quite in yaw trim=2C
one
> side or the other.
>
> Once flying=2C the static ports can be calibrated by taking a tiny bit of
> material off the aft side of each static port=2C if they are pressurizing
=2C or
> off the forward side of the hole if it is creating a vacuum.
>
> The reason I settled on this system for my Firestar is because I tried it
> single first=2C then found it to be a more workable solution with two por
ts.
>
> BTW: I used 1/16" ID ports.
>
> john h
> mkIII
> hauck's holler
> Titus=2C Alabama
John=2C
I clearly see the logic in the "each side" of the fuselage idea. It seem
s as
though if one side were being slightly pressurized=2C for the most part=2C
the opposite
side would equally 'depressurized'. I need to get another 'T'.
What about the interior hole through one of the 'T's'=2C which would incl
ude the
inside of the cabin into the static system? A small hole into one of the '
T's'
(in the static source) would then be giving you three locations of "suppose
dly"
unpressurized air=3B left side fuselage=2C right side fuselage=2C interior
fuselage.
Is this unnecessary=2C would it help any? Opinions???
I did a quick check of A/C Spruce=2C and this is vitually identical to wh
at I made=2C except that
my circular flat part is MUCH thinner than theirs=3B
http://www.aircraftspruce.com/catalog/inpages/alumstaticports.php
Also=2C from the looks of it in the photo=2C my drilled hole appears to b
e the exact
same size as in the photo. I'm trying to keep the inlet hole as small as p
ossible=2C to
reduce any "ram air" affect. I'll do some more research on the inlet hole
size.
Thanks for the pointers.....especially the 'each side of the fuselage' pa
rt.
Mike Welch
Message 12
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Subject: | Re: Kolb/Jabiru carb overflow |
I recommend simply using the lowest pressure output facet from AC spruce
with no regulator.
Why? because if the diaphragm in the regulator fails, it fails closed.
BB
MKIII, suzuki
>>>>>>>>>>>>>>>>>
I don't have any experience with this regulator. But all the regulators
I've been familiar with, when they fail, they fail open. From my
experience all regulators are all open until the outlet pressure reaches
the set point, then the outlet pressure presses against the diaphragm
working against the spring pressure to close them. as the gas is burned
off,, the pressure on the diafram drops and the valve opens to let
more gas through till the set point is reached and it is again off....
a continual small use through the carbs (the engine is running) will
set up a small flow through the regulator to keep up with the rate of
burn. if the top of the diafram is vented,, and the diafram leaks the
device will leak. i have rarely seen a regulator stick shutt. it is
normaly caused by something jaming or sticking in the valve.
Boyd young
mkiii
using the lowest setting faucett pump in serries with the engine driven
pump on a 912
Message 13
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Subject: | Re: Pitot static port location |
Here's my question; Do any of you have a recommended place on the
nosecone for the static pitot fitting? Or is it okay to locate it
ANYWHERE on the side of the nosecone? The inlet hole for the static air
is a drilled hole about .025 dia. (It is TINY!!!!!, just slightly
larger around than a pin)
>>>>>>>>>>>>>>
sorry about the drawing... this is what i did.
boyd young
mkiii
Message 14
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Subject: | Pitot static port location |
Hi Boyd=2C
Thanks for the drawing=2C your drawing is plenty good enough
for us to get the idea of what you have.
But=2C I would prefer to use those flush-mount type of static ports like
I previously showed the link of=3B the ones that look like this=3B
http://www.aircraftspruce.com/catalog/inpages/alumstaticports.php
From what I've been researching=2C I think John has me headed in
the right direction=2C namely a port on each side of the fuselage.
I'm afraid that if I had a port on the underside of the Xtra nosecone
it would definitely be getting slightly pressurized air with the flush
mounted type ports.
I still not sure about the interior vent hole through one of the "T's"=2C
though.
>From what I've been reading=2C it may not be all that necessary=2C
especially if a guy went with two side ports!
I did find that a Cessna 150 uses a .040" static hole (the guy said 1mm
=2C
which is .040") Cessna also has only one outside port=2C too. Some
of them have an inside port=2C which I guess you can open by way of a knob
or something=2C if you thought the outside was plugged=2C iced over=2C or w
hatever.
Thanks for the input=2C guys. I think I have enough good information to
go
ahead and finish the static line installation.
Mike Welch
MkIII
Message 15
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Subject: | Re: zenair floats plans. |
at grose you would.mine atre best suted for a singleseat or firestar--
--- -i =0Ahave a set of aeroset floats for $5,000=0A-Malcolm Brub
aker =0AMichigan Sport=0APilot Repair =0ALSRM-A, PPC, WS=0A(989)513-3022
=0A=0A=0A=0A=0A________________________________=0AFrom: Ellery Batchelder J
r <elleryweld@aol.com>=0ATo: kolb-list@matronics.com=0ASent: Sat, January 1
5, 2011 9:56:18 AM=0ASubject: Re: Kolb-List: zenair floats plans.=0A=0AMy G
rosse weight is 1250 I would probably sink them =0A=0A=0AEllery Batchelder
Jr.=0A=0A=0A-----Original Message-----=0AFrom: Malcolm Brubaker <brubakerma
l@yahoo.com>=0ATo: kolb-list@matronics.com=0ASent: Fri, Jan 14, 2011 7:46 p
m=0ASubject: Re: Kolb-List: zenair floats plans.=0A=0A=0A$2000 firm on the
price they are prety nice floats i lost all my pics onthe =0Acomputer so no
build pics but i could take some of them they are wraped in =0A=0Aphome an
d suran hanging in my hanger-- they are 12 ft long- 950 displacement
w =0Aone rutter no rigging =0A=0A-Malcolm Brubaker =0AMichigan Sport=0APi
lot Repair =0ALSRM-A, PPC, WS=0A(989)513-3022 =0A=0A=0A=0A=0A______________
__________________=0AFrom: "elleryweld@aol.com" <elleryweld@aol.com>=0ATo:
kolb-list@matronics.com=0ASent: Wed, January 12, 2011 7:04:50 PM=0ASubject:
"elleryweld@aol.com" <elleryweld@aol.com>=0A=0A=0A-----Original Message----
-=0ADate: Wednesday, January 12, 2011 5:53:36 pm=0ATo: kolb-list@matronics.
com=0AFrom: "Malcolm Brubaker" <brubakermal@yahoo.com>=0ASubject: Kolb-List
: zenair floats plans.=0A=0Aseveral years aho i sold a set of plans for the
zenair floats to a-Kolber =0A-can anyone rember buying a set?-- i
lost my copy and need another- mal=0A-Malcolm Brubaker =0AMichigan Spor
t=0APilot Repair =0ALSRM-A, PPC, WS=0A(989)513-3022 =0A=0Amalcolm i am the
one that got the plans for the floats from you i will see about =0Agetting
a copy made up i will let you know when i have that done i think i =0Aremem
ber where i last had them=0A=0A=0A________________________________=0AFrom:
"elleryweld@aol.com" <elleryweld@aol.com>=0ATo: kolb-list@matronics.com=0AS
ent: Wed, January 12, 2011 7:43:44 AM=0ASubject: RE: Kolb-List: Air foil fo
ryweld@aol.com>=0A=0Awould it reduce drag on a cable if you was to fold a p
eice of vinal tape in half =0A=0Ato leave a 3/4 inch trailing edge?- let
the testing begin =0A=0A-----Original Message-----=0ADate: Wednesday, Janua
ry 12, 2011 2:36:20 am=0ATo: <kolb-list@matronics.com>=0AFrom: "Nick Cassar
a" <nickc@mtaonline.net>=0ASubject: Kolb-List: Air foil for cable...=0A=0AK
olber's,=0A=0A=0A=0AA year or two ago someone posted drag values for parts
of a Kolb, if I=0Aremember right. I was amazed at the drag values for the c
ables on the p; - - - - =0A- - - - - - -Matt Drall=
============0A=0A=0A=0A=0A=0A =======
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Message 16
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Subject: | Re: Pitot static port location |
Mike, I'd recommend you do either static ports or just vent them into the
cockpit, not both, for the simple reason I think you'll play heck trying to
tune the system if you have both.
Yes, some Cessnas have an alternate static source valve with a knob on the
panel to actuate it, for those that don't, student pilots are taught that
should ice fowl the static ports the solution is to break the glass face of
the VSI and vent the system that way.
Rick Girard
On Sat, Jan 15, 2011 at 3:41 PM, Mike Welch <mdnanwelch7@hotmail.com> wrote:
> Hi Boyd,
>
> Thanks for the drawing, your drawing is plenty good enough
> for us to get the idea of what you have.
>
> But, I would prefer to use those flush-mount type of static ports like
> I previously showed the link of; the ones that look like this;
>
> http://www.aircraftspruce.com/catalog/inpages/alumstaticports.php
>
> From what I've been researching, I think John has me headed in
> the right direction, namely a port on each side of the fuselage.
> I'm afraid that if I had a port on the underside of the Xtra nosecone
> it would definitely be getting slightly pressurized air with the flush
> mounted type ports.
>
> I still not sure about the interior vent hole through one of the "T's",
> though.
> >From what I've been reading, it may not be all that necessary,
> especially if a guy went with two side ports!
>
> I did find that a Cessna 150 uses a .040" static hole (the guy said 1mm,
> which is .040") Cessna also has only one outside port, too. Some
> of them have an inside port, which I guess you can open by way of a knob
> or something, if you thought the outside was plugged, iced over, or
> whatever.
>
> Thanks for the input, guys. I think I have enough good information to go
> ahead and finish the static line installation.
>
> Mike Welch
> MkIII
>
>
> *
>
> *
>
>
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable
to imagine how we might possibly have gone wrong.
- G.K. Chesterton
Message 17
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Subject: | Re: Kolb/Jabiru carb overflow |
Chris,
Any possibility of high crankcase pressure pulsing the fuel pump diaphram?
Is the vent system open to atmospheric pressure?
I just think the spring failing is a stretch.
Thanks G.Aman
-----Original Message-----
From: ces308 <ces308@ldaco.com>
Sent: Thu, Jan 13, 2011 10:53 am
Subject: Kolb-List: Re: Kolb/Jabiru carb overflow
Mike and John,hello,
The fuel pump is on the side of the engine,right in the slipstream and hang
s
upside down and tilted...it looks like oil for lubrication comes from just
enough clearance around the push-rod to drip on the pump actuator and then
a
small ,about an 1/8 " hole at the bottom for an oil return to the crank
case...there is a cavity above that where the return spring is that has no
air
going through it or oil getting to it,so with the slipstream of cold air go
ing
over the hot/warm pump case it has to be making some moisture there....I do
n't
think it's a lot ,but enough to collect on the spring and the bottom of the
diaphragm.I have never seen moisture in the oil fill tube or the dipstick..
.Oil
temps in the winter...at 16* is 160-185...I have never found any water in m
y
fuel system...
I'll get a picture of where the pump goes on so you can see what I'm talkin
g
about...
chris ambrose
M3X/Jabiru A-2200 172. hrs TT
N327CS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=326879#326879
Message 18
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Subject: | Pitot static port location |
>Mike=2C I'd recommend you do either static ports or just vent them into th
e cockpit=2C not both=2C for the simple reason I think you'll play heck >tr
ying to tune the system if you have both.
>>Rick Girard
Hi Rick=2C
I'd say at this point I agree with you and John=2C I ought to go with jus
t the
two side ports.
I'm just thinking out-loud here........
At the risk of over-thinking this I was just wondering=2C since the main
objective of the 'static' source is simply that=2C "static" =2C what we wa
nt is
absolutely uncharged=2C unpressurized air. I definitely see the logic in J
ohn's
suggestion of the two side ports=2C but just the fact that the air is rushi
ng past
a nosecone has GOT to have some kind of slight pressurization=2C whether it
be positive or negative=2C however slight it may be.
When I try to wrap my mind around the objective of getting an "ambient"
static air source=2C I can't picture how having both (two side port fitting
s and
an inside hole in a fitting 'T') would do anything but create an even bette
r
balance to having zero pressure.
I'm not arguing with you=2C I just don't see it intuitively. You might b
e absolutely
correct.
It was my intention all along to try out the whole airspeed indicator(s)
system
in the car. Since my entire panel is somewhat portable at this point=2C an
d I do have
the entire pitot system 100% built=2C hoses=2C tubes=2C fittings and all=2C
I could set the
entire arrangement on the seat of my truck=2C and go buzzing down the highw
ay.
I could try a couple of pitot designs and try to get a feel for what might
work best in
my situation.
I think the thing I'm trying to get a good handle on is if the airspeed i
ndicator is
going to be 'reasonably' accurate on my first time out. I don't expect it
to be
gnat's ass perfect=2C but then I'd rather it wasn't off by 25 mph=2C either
. Maybe taking
it for a spin down the highway will give me a little indication of it's app
roximate
accuracy.
(BTW=2C I do realize that when flight testing the plane=2C the important
point is
to know what the airspeed indicator says for certain flight functions (like
stall
speed=2C for instance)=2C and learn those readings=2C regardless of how acc
urate they
are. In other words=2C if the ASI says stall happens at 37 mph=2C then nev
er try to
fly less than 37 mph.....period!!!
Hey=2C thanks for the help=2C guys. I'm going to try to get some 'down t
he highway'
readings. I'll let you know what I come up with. I also include various s
tatic
pitot source designs. More later.......
Mike Welch
Message 19
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Subject: | Re: Pitot static port location |
When I try to wrap my mind around the objective of getting an "ambient"
static air source, I can't picture how having both (two side port fittings
and
an inside hole in a fitting 'T') would do anything but create an even better
balance to having zero pressure.
Mike Welch
Mike W/Gang:
That is why I said you can fine tune the static ports after you fly the
airplane by taking a little material off the fore or aft side of the port,
depending on whether the ASI is reading high or low, pressure or vacuum.
There are also other ways to fine tune the static system. Use your
imagination.
You are looking for one static source that will read the same air pressure
as the pitot tube is flying in.
Testing your ASI in your truck will do nothing for the installation in your
airplane.
If you take a static source inside the cockpit of a MKIII or FS, it will be
low pressure. It is the nature of the nose pod flying through the air.
What I shared with you is a proven system that worked well for me.
john h
mkIII
hauck's holler
Titus, Alabama
Message 20
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Subject: | Re: Pitot static port location |
Nice drawing of a vulture with whiskers . . . just kidding . . .
On Sat, Jan 15, 2011 at 1:05 PM, b young <by0ung@brigham.net> wrote:
>
> Here's my question; Do any of you have a recommended place on the
> nosecone for the static pitot fitting? Or is it okay to locate it ANYWHERE
> on the side of the nosecone? The inlet hole for the static air is a drilled
> hole about .025 dia. (It is TINY!!!!!, just slightly larger around than a
> pin)
>
>
> >>>>>>>>>>>>>>
>
> sorry about the drawing... this is what i did.
> boyd young
> mkiii
>
>
Message 21
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Subject: | Re: Kolb/Jabiru carb overflow |
Gary,
The vent is good...today while waiting for the spring from Frank, I went to the
hardware store and bought a spring of the same diameter,but had less tension
than the gold spring Pete sent me and it seems to work fine...I will run it wide
open tomorrow,but it looks good so far ! 1.5 lbs at idle and 2 at 1400 rpm's.
I wish I would have taken a fuel pressure reading at my condition inspection...I
also have a fuel pressure sensor coming from GR Tech to keep checking
the pressure...Now I will have something to go by...
chris ambrose
M3X/Jab
N327CS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327164#327164
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Subject: | Re: Kolb/Jabiru carb overflow |
Jab guys...
Also did any of you know about this?? Got this from Lynn Matteson...
With all this talk about the float needle, let's remember that there
are black-tipped needles (the rubber end is black) and needles with
silver, gold, and *black* springs, (or at least a silver, gold, or
black colored spring end, which is a code for the strength of the
spring within the needle) and make sure you know which one you're
referring to.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Sensenich 62"x 55.5 Wood (winter) until the Prince prop arrives
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying...1078+ hrs (since 3-27-2006)
As Rosann Rosanna Danna always said," It just goes to show you...It's always
something ! " lol
And you thought this was a simple engine ! lol
chris ambrose
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327169#327169
Message 23
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Subject: | Pitot static port location |
John=2C
Okay!! I got the message! I'll proceed as you suggested.
Two side ports=2C 1/16" fitting holes=2C adjust as needed. Got it.
Thanks=2C
Mike W
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