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info(at)flylightning.net
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 Posted: Thu Jun 18, 2009 5:37 am Post subject: Leanable mixture control for jabiru engine. |
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Group,
We recently got a chance to play with the HacMan mixture control system from Green Sky Adventures. This allows manual mixture control of the bing carb on the 3300, or any bing for that matter. The unit consist of a valve body with adjustable knob, some plastic line and various barb fitting. It takes vacuum pressure from the vacuum port on the bottom of the carb thru an adjustable valve into the balance tube from the carb to airbox. The balance tube from the airbox to the carb allows the pressure in the carb to be at the same air-pressure as in the air coming into the carb. If you can change the pressure in the carb bowl you can change the mixture, this is evident if anyone has forgot to hook up the balance line, the carb runs very rich. Long story short using this valve you can introduce a vacuum into the bowl to make it harder for the venture effect to pull fuel out of the bowl. With the knob all the way in the bing works as it normally does.
Bill bought this from N197RW, his recently completed Lighting here in SYI.
Yesterday I did a test flight. Leveled off at 3,500 msl with a DA of 5,000. Set 2850 and flew around for 5 minutes to let all stabilize with the control full rich, or normal bing operation in this case. My EGT’s were around 1300 degrees. I turned the knob out a turn or so and the egts with in about 30 seconds came up to 1350, I than fine tuned it to get about 1375 or so, worked perfectly. To make sure it wasn’t a joke I turned it back in and the egts all dropped back down to 1300. So up I went to 9000msl and a DA of about 11500. set 2850 for about 5 min. The egts up there were about 1230-1250. I turned the knob out the same and got them up to 1300, so out a little further and I was able to tune for about 1350-1375…..impressed. turned it in and all went back to 1250 or so. This thing really does work. The fuel flow is not calibrated in the plane so the numbers are not needed but the fuel flow did go down as the system was “leaned”.
I will have to say that at WOT in climbs the system does not do a lot. I think the venturi in the carb is too much for the amount of vacuum you can introduce to compensate. It will lean about 50 degrees or so at WOT. So I would say get the main jet set right for WOT and than get the needle jet for cruise close.
This thing really works in cruise and that is where you need it. I think I will be getting one to have in our lightning.
Nick Otterback
Arion Aircraft, LLC
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8wn(at)comcast.net
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| Posted: Thu Jun 18, 2009 10:43 am Post subject: Leanable mixture control for jabiru engine. |
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Hi Nick
Sounds good. Which kit is installed on the Lightning? Does the 4' length work of do you order longer? What jets were you using?
Thanks. Ready to order today. Johnny
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info(at)flylightning.net
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| Posted: Mon Jun 22, 2009 6:24 am Post subject: Leanable mixture control for jabiru engine. |
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Johnny,
You can get this from Green Sky adventures, I think they have a web site to order from. Seems to work well so far.
nick
From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of Johnny Thompson
Sent: Thursday, June 18, 2009 1:43 PM
To: lightning-list(at)matronics.com
Subject: Re: Lightning-List: Leanable mixture control for jabiru engine.
Hi Nick
Sounds good. Which kit is installed on the Lightning? Does the 4' length work of do you order longer? What jets were you using?
Thanks. Ready to order today. Johnny
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N1BZRich(at)aol.com
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| Posted: Mon Jun 22, 2009 7:43 am Post subject: Leanable mixture control for jabiru engine. |
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Johnny (or anyone else that might try this system),
This system certainly sounds interesting as all the fuel flow testing I did some time ago seemed to point to the fact that the higher you go, the less efficient the Bing auto leaning set up worked. Since most of my cross countries are up in the 8,000 to 10,000 foot range, I can certainly see the benefits of being able to manually lean the Bing carb. If most of your flying is below 5,000, then I am not as sure it would be all that beneficial.
So, if Johnny or anyone on the Lightning list installs this system on your jet, all of us could benefit from your test results. I would certainly like to have someone do an article on the installation of this system and the flight test fuel flow test results. Would be great info for our Lightning newsletter.
Blue Skies,
Buz
An Excellent Credit Score is689/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=JuneExcfooterNO62>See Yours in Just 2 Easy Steps!
[quote][b]
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info(at)flylightning.net
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| Posted: Mon Jun 22, 2009 8:17 am Post subject: Leanable mixture control for jabiru engine. |
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Buz,
I would agree that below say 5k that it may not do much for a properly jetted carb. However at altitude it seems to do a great deal. Out on the west coast where you may from time to time climb to 12 or 14k for going over the mountains this would do the trick, Or if you live at high altitude already. I think you could get your main jet correct and than get close with the needle jet for normal flight altitude and than use this to compensate on cross countries.
Nick
From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of N1BZRich(at)aol.com
Sent: Monday, June 22, 2009 10:31 AM
To: lightning-list(at)matronics.com
Subject: Re: Lightning-List: Leanable mixture control for jabiru engine.
Johnny (or anyone else that might try this system),
This system certainly sounds interesting as all the fuel flow testing I did some time ago seemed to point to the fact that the higher you go, the less efficient the Bing auto leaning set up worked. Since most of my cross countries are up in the 8,000 to 10,000 foot range, I can certainly see the benefits of being able to manually lean the Bing carb. If most of your flying is below 5,000, then I am not as sure it would be all that beneficial.
So, if Johnny or anyone on the Lightning list installs this system on your jet, all of us could benefit from your test results. I would certainly like to have someone do an article on the installation of this system and the flight test fuel flow test results. Would be great info for our Lightning newsletter.
Blue Skies,
Buz
An Excellent Credit Score is689/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=JuneExcfooterNO62>See Yours in Just 2 Easy Steps!
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[quote][b]
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8wn(at)comcast.net
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| Posted: Mon Jun 22, 2009 9:07 am Post subject: Leanable mixture control for jabiru engine. |
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Yes, I'll fly at 10,000 and land at 6,000 DA on a cool day. What I needed NIck was the cable length that you use on the Lightning you built. The standard is 4' but they will add as you need. Do you remember what you installed? Thanks Johnny
[quote] ---
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info(at)flylightning.net
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| Posted: Mon Jun 22, 2009 10:19 am Post subject: Leanable mixture control for jabiru engine. |
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Johnny,
There aren’t any cables the control is hooked up thru about 4 feet of static line though.
nick
From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of Johnny Thompson
Sent: Monday, June 22, 2009 12:02 PM
To: lightning-list(at)matronics.com
Subject: Re: Lightning-List: Leanable mixture control for jabiru engine.
Yes, I'll fly at 10,000 and land at 6,000 DA on a cool day. What I needed NIck was the cable length that you use on the Lightning you built. The standard is 4' but they will add as you need. Do you remember what you installed? Thanks Johnny
[quote]
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