Today's Message Index:
----------------------
1. 06:14 AM - Re: Here's an idea that DIDN'T work (Lynn Matteson)
2. 09:20 AM - Re: Aero Carb (Mark Hubelbank)
3. 02:24 PM - Re: Here's an idea that DIDN'T work (Peter Harris)
4. 07:17 PM - Scrap 2200 Jabiru needed (Lynn Matteson)
Message 1
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| Subject: | Re: Here's an idea that DIDN'T work |
The centrally-located fuel discharge tube has about 50 .010" holes
in it. They are about 1/16" apart at first, then get closer together
as you go up the tube, then when they can't get much closer, they
offset or staggr them, then further up they are set at an angle to
one another. So looking at the tube when the slide is set on idle,
only about one or two holes are revealed, then as the slide is
opened, more and more of the holes are revealed. When I hooked mine
up and turned on the main fuel valve, nothing dripped from the
discharge tube even though I had the slide wide open. Then...just as
Paul (the Rotec rep at Oshkosh) said it would...I pressed the "primer
button" on the regulator body, and all of those holes began to flow
fuel. It was quite impressive. Paul was quite honest in telling us
that they stole that idea right from Ellison. And by the way, when I
released the primer button, the fuel quit right now and did not leak
a drop. The mixture control arm rotates that discharge tube so that
the holes are facing the incoming air at lean, and at 90 degrees to
the air when set on rich, so that the air passing over the tube draws
the fuel out, like any siphon device would....an old bug sprayer
comes to mind as the simplest of this application, or a paint sprayer.
The discharge tube sits in the middle of the slide, and has a teflon
seal around it so that at any position of the slide, there is no
leakage from the holes that are "hidden" inside the slide. There is
also a teflon seal around the rod that operates the slide, and a
teflon sheet that is positioned under the slide on the suction
side....apparently what Aerocarb did not have at first.
I bought mine at Oshkosh for 595 US dollars, and they were to go
higher as of the first of August or so. It looks like they went up a
couple of hundred US, or thereabouts.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 761.4 hrs
Countdown to 1000 hrs~239 to go
Sensenich 62"x46" Wood prop
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying
On Sep 10, 2009, at 2:37 AM, Peter Harris wrote:
> <peterjfharris@bigpond.com>
>
> Lynn they are Stainless steel.
> I see that the Rotec cable attachment is offset but not so bad as the
> Aerocarb. It looks well made but is expensive.
> Peter
>
Message 2
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Brad,
I said that I would let you know if I got the AeroCarb working. I
did not. At this point I have given up on it. I found three problems in
the CH601XL installation.
First and the no-go was the fact that with the carb at idle setting
and the electric fuel pump on, the fuel flow rate is still so high that
fuel effectively pours on the area close to the exhaust system. I
consider this to be a fire hazard. Some aircraft do not have a muffler
mounted almost under the carb but the CH601XL with the Jabiru 3300
firewall forward kit does. I know that if one pulls the carb mixture to
idle cutoff there will be no fuel flow but I believe there must be at
least two failure modes for most things to go wrong in an aircraft.
Simply having the electric pump on while attempting an engine start can
pour a lot of fuel out. If the exhaust system was already hot (as in
engine re-start), this really does not sound good.
Secondly it is very hard to get the mixture lean enough at idle. The
fuel flow rate with the needle all the way in is still too high. One can
get an idle but it is very rich. I expect that with a gravity fuel
system the pressure is much lower and this is not a problem.
Finally, this design is extremely sensitive to vapor bubbles in the
fuel lines. Again, with a gravity fuel system, this may not be a problem
as the amount of fuel line under the cowling is greatly reduced. Having
a lot of fuel line even when insulated appears to be a problem.
I am in the process of putting in a Rotec TBI 40. More on that latter.
On 9/5/2009 8:32 PM, Rosalie wrote:
>
> Hello. I fly a Zodiac XL with a Jabiru 3300. I am considering
> replacing the Bing carby with an Aero Carb. I've read a lot about the
> Aero Carb. Now I would like to find information from those who have
> actually used it on the Jab 3300. What are the good points? Are
> there any criticisms or bad points? I also fly certified aircraft so
> I am used to having mixture control on those planes. I live near
> mountains so getting over them is a must...I sometimes fly short
> distances as high as 13500 feet. Any information from experience that
> you might have is greatly appreciated.
>
> Brad DeMeo
> N601BD
> CH601XL
> California
--
Mark Hubelbank
NorthEast Monitoring
2 Clock Tower Place
Suite 555
Maynard, MA, 01754 - USA
mhubel@nemon.com
978-443-3955
Message 3
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| Subject: | Here's an idea that DIDN'T work |
Lynn,
It seems very similar to the Ellison.
The aerocarb slide is also fitted with a compound gasket to reduce friction
on the suction side, but the offset action of the cable is enough to twist
and at the same time angle the slide so that the other three surfaces
contact metal to metal and there is a high coefficient of friction between
any two anodized Al surfaces.
Peter
-----Original Message-----
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Lynn
Matteson
Sent: Thursday, 10 September 2009 11:02 PM
Subject: Re: JabiruEngine-List: Here's an idea that DIDN'T work
The centrally-located fuel discharge tube has about 50 .010" holes
in it. They are about 1/16" apart at first, then get closer together
as you go up the tube, then when they can't get much closer, they
offset or staggr them, then further up they are set at an angle to
one another. So looking at the tube when the slide is set on idle,
only about one or two holes are revealed, then as the slide is
opened, more and more of the holes are revealed. When I hooked mine
up and turned on the main fuel valve, nothing dripped from the
discharge tube even though I had the slide wide open. Then...just as
Paul (the Rotec rep at Oshkosh) said it would...I pressed the "primer
button" on the regulator body, and all of those holes began to flow
fuel. It was quite impressive. Paul was quite honest in telling us
that they stole that idea right from Ellison. And by the way, when I
released the primer button, the fuel quit right now and did not leak
a drop. The mixture control arm rotates that discharge tube so that
the holes are facing the incoming air at lean, and at 90 degrees to
the air when set on rich, so that the air passing over the tube draws
the fuel out, like any siphon device would....an old bug sprayer
comes to mind as the simplest of this application, or a paint sprayer.
The discharge tube sits in the middle of the slide, and has a teflon
seal around it so that at any position of the slide, there is no
leakage from the holes that are "hidden" inside the slide. There is
also a teflon seal around the rod that operates the slide, and a
teflon sheet that is positioned under the slide on the suction
side....apparently what Aerocarb did not have at first.
I bought mine at Oshkosh for 595 US dollars, and they were to go
higher as of the first of August or so. It looks like they went up a
couple of hundred US, or thereabouts.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 761.4 hrs
Countdown to 1000 hrs~239 to go
Sensenich 62"x46" Wood prop
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying
On Sep 10, 2009, at 2:37 AM, Peter Harris wrote:
> <peterjfharris@bigpond.com>
>
> Lynn they are Stainless steel.
> I see that the Rotec cable attachment is offset but not so bad as the
> Aerocarb. It looks well made but is expensive.
> Peter
>
Checked by AVG - www.avg.com
05:50:00
Message 4
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| Subject: | Scrap 2200 Jabiru needed |
I'm going to try some things on my Jabiru 2200, and I'd like to find
a scrap engine, in any condition, to do some set-up work on. I would
need a block, cylinders, heads, oil pan, and intake pipes. Nothing
else is needed, I think. I just want to try some different intake
manifolding, so condition is unimportant....the junkier the better,
with reason. In fact, it wouldn't have to be scrap, I could turn it
into scrap for you. : )
Seriously, I just need the engine to make some measurements from and
it could be returned unharmed. I could pick it up if not TOO far
away. Let me know if anybody has something....hopefully in the US to
keep shipping/travel costs down.
The reason for wanting another engine is to keep my plane flying and
not tied up while I do some designing on a different intake manifold
system.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 762.9 hrs
Countdown to 1000 hrs~237 to go
Sensenich 62"x46" Wood prop
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying
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