AeroElectric-List Digest Archive

Fri 03/30/07


Total Messages Posted: 12



Today's Message Index:
----------------------
 
     1. 03:16 AM - Re: DIY engine monitor (raymondj)
     2. 03:38 AM - Re: OFF DIY engine monitor (raymondj)
     3. 05:59 AM - Avionics Mounting ()
     4. 06:26 AM - Re: Avionics Mounting (BobsV35B@aol.com)
     5. 06:37 AM - Re: Avionics Mounting (Sam Marlow)
     6. 08:59 AM - Re: Avionics Mounting (BobsV35B@aol.com)
     7. 09:03 AM - Avionics Mounting (BobsV35B@aol.com)
     8. 10:36 AM - FW: OFF DIY engine monitor (raymondj)
     9. 02:17 PM - Re: Avionics Mounting (RV_10)
    10. 08:03 PM - Re: Avionics Mounting (Greg Vouga)
    11. 08:09 PM - Re: OFF DIY engine monitor (raymondj)
    12. 09:07 PM - Avionics Mounting (BobsV35B@aol.com)
 
 
 


Message 1


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    Time: 03:16:16 AM PST US
    From: "raymondj" <raymondj@frontiernet.net>
    Subject: DIY engine monitor
    Thanks for the link. Raymond Julian Kettle River, MN do not archive -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Ralph Hoover Sent: Thursday, March 29, 2007 5:49 AM Subject: AeroElectric-List: DIY engine monitor Try Rocky Mountain Instruments ( http://www.rkymtn.com/Home.htm -- Ralph C. Hoover RV7A hooverra at verizon dot net


    Message 2


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    Time: 03:38:11 AM PST US
    From: "raymondj" <raymondj@frontiernet.net>
    Subject: DIY engine monitor
    -----Original Message----- From: raymondj [mailto:raymondj@frontiernet.net] Sent: Friday, March 30, 2007 12:19 AM Subject: RE: OFF AeroElectric-List: DIY engine monitor Greetings Bob, I am slightly familiar with GAMI's work on lean of peak operation and dispelling other OWTs as they call them. I haven't gone to deeply into their work because I will not have injectors. I was not familiar with the "lean test". If my understanding of the "lean test" is correct, when you fall over, you "leaned" too far. But seriously, if my understanding of the "lean test" is correct it will tell me the "spread" on my cylinders, indicating unequal distribution of fuel from the carb. The only way I can think of to change that would be to modify the intake manifold. This test will give useful info during R&D of the intake manifold, and I will use it then, but I can't think of any other time when I would apply it. If there is another application of this test I would like to learn of it. I appreciate your input. Thanks, Raymond Julian Kettle River, MN -----Original Message----- From: BobsV35B@aol.com [mailto:BobsV35B@aol.com] Sent: Thursday, March 29, 2007 7:19 AM To: raymondj@frontiernet.net Subject: OFF AeroElectric-List: DIY engine monitor Good Morning Raymond, That DOES make good sense! Thanks for letting me know the reasons behind your request. While I have no thoughts at all concerning the way to get an individual CHT reading, I would still recommend adding the fuel flow unit to your monitor. I believe it to be even more important if you can't get individual cylinder temperature indications. Are you familiar with the process that is commonly known as the GAMI check? It uses a very accurate electronic fuel flow unit as the basis for evaluating the adequacy of mixture distribution among the cylinders. Since mixture distribution is key to smooth operations and long engine life, that is a very important factor and I know of no better and cheaper way to get that information. If you have not read through the GAMI procedure, you night find it helpful to check out the process at: http://www.gami.com/ Once you have the home page, look down the sites listed on the left side to LEAN TEST. Click on that and it will tell you how to do the check. GAMIs would be nice so that changes can be made, but, the process still works regardless of whether or not you have a carburetor or fuel injection! And Last but certainly not least, Thank you for doing this old heart good by installing a T&B! Happy Skies, Old Bob AKA Bob Siegfried Ancient Aviator Stearman N3977A Brookeridge Air Park LL22 Downers Grove, IL 60516 630 985-8503 In a message dated 3/29/2007 12:59:22 A.M. Central Daylight Time, raymondj@frontiernet.net writes: Good evening Bob, 1st, let me correct my previous post I am looking for 6 EGT and 2 CHT. I will be using it to monitor a 6 cyl engine, a Corvair engine to be exact. The Corvair has 2 heads that span 3 cyl each and the info I've read says there will be very little difference between different CHTs monitored on the same head above each cylinder. If some way to monitor the combustion chamber temp other than a CHT is available, I would certainly have a 6 and 6 monitor. I would include a fuel flow monitor, a mixture gauge, a carb temp monitor, and perhaps even a detonation sensor in the group of instruments. I was trying to keep it simple in terms of the building the monitor with the 6 and 2 design. I'm still trying to find the balance between simplicity and the "You can never be too rich, too tan, or have too much info" mindset. Thanks for the input. By the way, I decided to put a T&B, after reading your argument for it, over a TC. Raymond Julian Kettle River, MN. do not archive ---------------------------------------------------------------------------- See what's free at AOL.com.


    Message 3


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    Time: 05:59:40 AM PST US
    From: <bakerocb@cox.net>
    Subject: Avionics Mounting
    3/30/2007 Hello Greg, Check out a not-so-cheap solution here http://www.radiorax.com/ and also to get some idea of what is involved in installing a stack of avionics. OC -- The best investment we can make is the effort to gather and understand knowledge. PS: That is a great selection of equipment. Time: 06:53:31 PM PST US From: "Greg Vouga" <gmvouga@hotmail.com> Subject: Avionics-List: Avionics Mounting Hi All, I am hoping to get some info on mounting a stack of Garmin equipment in my RV-7A. I just received a GMA-340, GNS-430W, SL-30, and GTX-327 with mounting trays. I'm told that the rest of the mounting hardware such as screws, brackets, etc. are not included. I can start looking for low profile screws and fabricate brackets, but I don't want to re-invent the wheel if it's not necessary. Are there reasonably priced installation kits out there? How have others handled this? Thanks in advance, Greg gvouga@gmail.com


    Message 4


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    Time: 06:26:10 AM PST US
    From: BobsV35B@aol.com
    Subject: Re: Avionics Mounting
    In a message dated 3/30/2007 8:01:56 A.M. Central Daylight Time, bakerocb@cox.net writes: Hello Greg, Check out a not-so-cheap solution here http://www.radiorax.com/ and also to get some idea of what is involved in installing a stack of avionics. Good Morning OC, For What It Is Worth; I installed a set of the RadioRax in my Bonanza a few years ago. They aren't cheap, but they sure work nice and the assistance from the manufacturer was terrific. Happy Skies, Old Bob AKA Bob Siegfried Ancient Aviator Stearman N3977A Brookeridge Air Park LL22 Downers Grove, IL 60516 630 985-8503 ************************************** See what's free at http://www.aol.com.


    Message 5


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    Time: 06:37:17 AM PST US
    From: Sam Marlow <sam@fr8dog.net>
    Subject: Re: Avionics Mounting
    I have the same radio stack, just used .250 AL bar, and taped the holes for #8 screws. I also added 1 support in the rear of the stack. bakerocb@cox.net wrote: > > 3/30/2007 > > Hello Greg, Check out a not-so-cheap solution here > > http://www.radiorax.com/ > > and also to get some idea of what is involved in installing a stack of > avionics. > > OC -- The best investment we can make is the effort to gather and > understand knowledge. > > PS: That is a great selection of equipment. > > Time: 06:53:31 PM PST US > From: "Greg Vouga" <gmvouga@hotmail.com> > Subject: Avionics-List: Avionics Mounting > > Hi All, I am hoping to get some info on mounting a stack of Garmin > equipment in my > RV-7A. I just received a GMA-340, GNS-430W, SL-30, and GTX-327 with > mounting trays. I'm told that the rest of the mounting hardware such as > screws, brackets, etc. are not included. > > I can start looking for low profile screws and fabricate brackets, but I > don't want to re-invent the wheel if it's not necessary. Are there > reasonably priced installation kits out there? How have others handled > this? > > Thanks in advance, > > Greg > gvouga@gmail.com > >


    Message 6


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    Time: 08:59:14 AM PST US
    From: BobsV35B@aol.com
    Subject: Re: Avionics Mounting
    In a message dated 3/30/2007 8:39:20 A.M. Central Daylight Time, sam@fr8dog.net writes: I have the same radio stack, just used .250 AL bar, and taped the holes for #8 screws. I also added 1 support in the rear of the stack. Good Morning Happy Skies, Old Bob AKA Bob Siegfried Ancient Aviator Stearman N3977A Brookeridge Air Park LL22 Downers Grove, IL 60516 630 985-8503 ************************************** See what's free at http://www.aol.com.


    Message 7


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    Time: 09:03:58 AM PST US
    From: BobsV35B@aol.com
    Subject: Avionics Mounting
    Good Morning Sam, The advantage (if there is any) to the RadioRax is that they are infinitely adjustable. If you want to rearrange or add anything to the stack, there is no need to drill new holes. With any of the more conventional strips, the new holes often conflict with old holes which will then require that a new support bar be fabricated and installed. If you are absolutely certain you will never want to change anything, there is little advantage to the RadioRax system. Happy Skies, Old Bob AKA Bob Siegfried Ancient Aviator Stearman N3977A Brookeridge Air Park LL22 Downers Grove, IL 60516 630 985-8 In a message dated 3/30/2007 8:39:20 A.M. Central Daylight Time, sam@fr8dog.net writes: I have the same radio stack, just used .250 AL bar, and taped the holes for #8 screws. I also added 1 support in the rear of the stack. 503 ************************************** See what's free at http://www.aol.com.


    Message 8


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    Time: 10:36:06 AM PST US
    From: "raymondj" <raymondj@frontiernet.net>
    Subject: DIY engine monitor
    My apologies! I accidentally moved this discussion off list. This post brings it back to the list with no lost information. Raymond Julian Kettle River, MN archive -----Original Message----- From: BobsV35B@aol.com [mailto:BobsV35B@aol.com] Sent: Friday, March 30, 2007 8:13 AM Subject: OFF AeroElectric-List: DIY engine monitor In a message dated 3/30/2007 1:15:53 A.M. Central Daylight Time, raymondj@frontiernet.net writes: Greetings Bob, I am slightly familiar with GAMI's work on lean of peak operation and dispelling other OWTs as they call them. I haven't gone to deeply into their work because I will not have injectors. I was not familiar with the "lean test". If my understanding of the "lean test" is correct, when you fall over, you "leaned" too far. But seriously, if my understanding of the "lean test" is correct it will tell me the "spread" on my cylinders, indicating unequal distribution of fuel from the carb. The only way I can think of to change that would be to modify the intake manifold. This test will give useful info during R&D of the intake manifold, and I will use it then, but I can't think of any other time when I would apply it. If there is another application of this test I would like to learn of it. I appreciate your input. Thanks, Raymond Julian Kettle River, MN Good Morning Raymond, Your thought about using the information during R&D is dead on, but it is even more useful to check for changes that are occurring during normal operations. There is nothing I am aware of that works as well as fuel injection to attain an even mixture to all cylinders, but there are lot's of techniques that were used before fuel injection became common. The major problem has always been getting the same amount of air into each cylinder. The second challenge is getting the same amount of fuel in every parcel of air! The shape and length of intake tubes is one aspect. Leaks are a major problem. There is a potential for a change in the balance due to RPM and even the amount of manifold pressure available. In high performance automobile engines, the big boys claim that tuned intake and exhaust pipes can make a difference as to how much air gets into each cylinder. That is probably less of a factor in our low RPM engines, but Continental has made an effort in that direction with their newer top mounted intake pipe arrangement. Lycoming attacked the exhaust portion in the fifties with their crossover exhaust. Outside of the leaks, not much we can do there, but it is worth keeping in mind. Getting an even amount of fuel into each parcel of air is a bit easier. Introducing turbulence into the airflow can help whatever fuel is added to be distributed evenly throughout the air that does make it into the cylinder. Unfortunately, that same turbulence can interfere with the amount of air that flows! The temperature of the air will also affect the fuel distribution. Most of my experimentation has been with the six cylinder horizontally opposed Continentals that have been used in the Bonanzas. I bought my first one in 1954. It was a very old airplane at the time. Seven years old which we consider to be an antique on it's last legs, but it was all a poor young copilot could afford. Things sure have changed! Since I had just been to school on the latest, finest, and fastest airliner in the skies, the Douglas DC-7 with a Wright Turbo Compound engine, I was all up to date on the benefits of lean side operations. I started to seriously investigate the possibility of operating my Bonanza on the lean side of best power. The first order of business was to check the mixture distribution. My method was to slowly lean the engine and monitor the engine RPM. Since the early Bonanza was equipped with an electric controllable pitch propellor, it was a fixed pitch propellor when I was not actually changing the pitch by operating the pitch change system. As the mixture was leaned, the RPM would increase, then slowly start to decrease. I had read all of Charles Lindbergh's writings and that is the method he had used to determine the balance of his distribution. Peak RPM was peak power and anything beyond peak RPM placed the engine on the lean side. Lindbergh had mentioned that he normally leaned the Challenger engine for about a fifty RPM drop, though the precise RPM used was a number that had been given to him by a professor at the New York City University who had developed precise data for his use. I found that, on that first Bonanza, I could lean and the engine would smoothly drop until it finally quit. The engine never got rough at all. I had lucked out and had a distribution that was almost perfect at the RPM and manifold pressure being used. My next Bonanza had nowhere near as good distribution and got rough before the RPM even peaked! Why do I bore you with all this information? Because there are many things that can affect the distribution and a good engine monitor can be of great value in trouble shooting the imbalance. Sometimes I found that merely changing the RPM by fifty to one hundred RPM made things better. Other times, I could throttle back until I could see the very first indication of manifold pressure reduction and find the balance to be better. As I am sure you are aware, the last little bit of throttle movement does not open the throttle valve any further (it is already full open), but it does add more fuel via the enrichment valve or whatever arrangement is on that particular fuel delivery system. Throttling back in that manner probably improved things by changing the mixture flow just a bit or it may have been because the throttle valve has moved far enough to introduce a bit of turbulence. I even found that I could affect mixture balance by things as basic as getting better alignment of intake tubes. I also messed around with polishing the small brass tubes within the carburetor through which the fuel flowed. All of my random experimentation would have been much more productive if I had been equipped with a modern engine monitor and if I had thought about doing a lean test. To me, the data presented by GAMI is the first really useful knowledge given us about how to operate our engines since that nameless college professor explained it to Lindbergh in 1927. Do the GAMI lean test during the R&D phase for the educational virtues and to figure out how to improve things. Follow that with checks during normal operation to catch things that change! Happy Skies, Old Bob AKA Bob Siegfried Ancient Aviator Stearman N3977A Brookeridge Air Park LL22 Downers Grove, IL 60516 630 985-8503 ---------------------------------------------------------------------------- ---- See what's free at AOL.com.


    Message 9


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    Time: 02:17:10 PM PST US
    From: "RV_10" <john_rv10@yahoo.com>
    Subject: Avionics Mounting
    Hi Bob, Do you have any photos of your install that you could send to me? Thank you, John Cleary _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of BobsV35B@aol.com Sent: Saturday, 31 March 2007 1:56 AM Subject: Re: AeroElectric-List: Avionics Mounting In a message dated 3/30/2007 8:39:20 A.M. Central Daylight Time, sam@fr8dog.net writes: I have the same radio stack, just used .250 AL bar, and taped the holes for #8 screws. I also added 1 support in the rear of the stack. Good Morning Happy Skies, Old Bob AKA Bob Siegfried Ancient Aviator Stearman N3977A Brookeridge Air Park LL22 Downers Grove, IL 60516 630 985-8503 _____ See what's free at AOL.com <http://www.aol.com?ncid=AOLAOF00020000000503> .


    Message 10


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    Time: 08:03:36 PM PST US
    From: "Greg Vouga" <gmvouga@hotmail.com>
    Subject: Avionics Mounting
    All, Due to the large amount of responses, I can't respond to everyone individually. However, rest assured that all of the responses were read and very much appreciated. What did people do 20 years ago wthout a resource such as this? Anyways, i've decided to move forward with the simple Aluminum angle technique. It's cheap and i have the stuff to complete it tomorrow. Thanks again to everyone that responded. Greg _________________________________________________________________ Interest Rates near 39yr lows! $430,000 Mortgage for $1,399/mo - Calculate new payment


    Message 11


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    Time: 08:09:30 PM PST US
    From: "raymondj" <raymondj@frontiernet.net>
    Subject: DIY engine monitor
    Old Bob, I had not considered the use of the monitor to collect data points as time passes. That will be useful. Thanks, Raymond Julian Kettle River, MN do not archive -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of raymondj Sent: Friday, March 30, 2007 12:35 PM To: aeroelectric-list@matronics.com Subject: FW: OFF AeroElectric-List: DIY engine monitor My apologies! I accidentally moved this discussion off list. This post brings it back to the list with no lost information. Raymond Julian Kettle River, MN archive -----Original Message----- From: BobsV35B@aol.com [mailto:BobsV35B@aol.com] Sent: Friday, March 30, 2007 8:13 AM To: raymondj@frontiernet.net Subject: OFF AeroElectric-List: DIY engine monitor In a message dated 3/30/2007 1:15:53 A.M. Central Daylight Time, raymondj@frontiernet.net writes: Greetings Bob, I am slightly familiar with GAMI's work on lean of peak operation and dispelling other OWTs as they call them. I haven't gone to deeply into their work because I will not have injectors. I was not familiar with the "lean test". If my understanding of the "lean test" is correct, when you fall over, you "leaned" too far. But seriously, if my understanding of the "lean test" is correct it will tell me the "spread" on my cylinders, indicating unequal distribution of fuel from the carb. The only way I can think of to change that would be to modify the intake manifold. This test will give useful info during R&D of the intake manifold, and I will use it then, but I can't think of any other time when I would apply it. If there is another application of this test I would like to learn of it. I appreciate your input. Thanks, Raymond Julian Kettle River, MN Good Morning Raymond, Your thought about using the information during R&D is dead on, but it is even more useful to check for changes that are occurring during normal operations. There is nothing I am aware of that works as well as fuel injection to attain an even mixture to all cylinders, but there are lot's of techniques that were used before fuel injection became common. The major problem has always been getting the same amount of air into each cylinder. The second challenge is getting the same amount of fuel in every parcel of air! The shape and length of intake tubes is one aspect. Leaks are a major problem. There is a potential for a change in the balance due to RPM and even the amount of manifold pressure available. In high performance automobile engines, the big boys claim that tuned intake and exhaust pipes can make a difference as to how much air gets into each cylinder. That is probably less of a factor in our low RPM engines, but Continental has made an effort in that direction with their newer top mounted intake pipe arrangement. Lycoming attacked the exhaust portion in the fifties with their crossover exhaust. Outside of the leaks, not much we can do there, but it is worth keeping in mind. Getting an even amount of fuel into each parcel of air is a bit easier. Introducing turbulence into the airflow can help whatever fuel is added to be distributed evenly throughout the air that does make it into the cylinder. Unfortunately, that same turbulence can interfere with the amount of air that flows! The temperature of the air will also affect the fuel distribution. Most of my experimentation has been with the six cylinder horizontally opposed Continentals that have been used in the Bonanzas. I bought my first one in 1954. It was a very old airplane at the time. Seven years old which we consider to be an antique on it's last legs, but it was all a poor young copilot could afford. Things sure have changed! Since I had just been to school on the latest, finest, and fastest airliner in the skies, the Douglas DC-7 with a Wright Turbo Compound engine, I was all up to date on the benefits of lean side operations. I started to seriously investigate the possibility of operating my Bonanza on the lean side of best power. The first order of business was to check the mixture distribution. My method was to slowly lean the engine and monitor the engine RPM. Since the early Bonanza was equipped with an electric controllable pitch propellor, it was a fixed pitch propellor when I was not actually changing the pitch by operating the pitch change system. As the mixture was leaned, the RPM would increase, then slowly start to decrease. I had read all of Charles Lindbergh's writings and that is the method he had used to determine the balance of his distribution. Peak RPM was peak power and anything beyond peak RPM placed the engine on the lean side. Lindbergh had mentioned that he normally leaned the Challenger engine for about a fifty RPM drop, though the precise RPM used was a number that had been given to him by a professor at the New York City University who had developed precise data for his use. I found that, on that first Bonanza, I could lean and the engine would smoothly drop until it finally quit. The engine never got rough at all. I had lucked out and had a distribution that was almost perfect at the RPM and manifold pressure being used. My next Bonanza had nowhere near as good distribution and got rough before the RPM even peaked! Why do I bore you with all this information? Because there are many things that can affect the distribution and a good engine monitor can be of great value in trouble shooting the imbalance. Sometimes I found that merely changing the RPM by fifty to one hundred RPM made things better. Other times, I could throttle back until I could see the very first indication of manifold pressure reduction and find the balance to be better. As I am sure you are aware, the last little bit of throttle movement does not open the throttle valve any further (it is already full open), but it does add more fuel via the enrichment valve or whatever arrangement is on that particular fuel delivery system. Throttling back in that manner probably improved things by changing the mixture flow just a bit or it may have been because the throttle valve has moved far enough to introduce a bit of turbulence. I even found that I could affect mixture balance by things as basic as getting better alignment of intake tubes. I also messed around with polishing the small brass tubes within the carburetor through which the fuel flowed. All of my random experimentation would have been much more productive if I had been equipped with a modern engine monitor and if I had thought about doing a lean test. To me, the data presented by GAMI is the first really useful knowledge given us about how to operate our engines since that nameless college professor explained it to Lindbergh in 1927. Do the GAMI lean test during the R&D phase for the educational virtues and to figure out how to improve things. Follow that with checks during normal operation to catch things that change! Happy Skies, Old Bob AKA Bob Siegfried Ancient Aviator Stearman N3977A Brookeridge Air Park LL22 Downers Grove, IL 60516 630 985-8503 ---------------------------------------------------------------------------- -- See what's free at AOL.com.


    Message 12


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    Time: 09:07:18 PM PST US
    From: BobsV35B@aol.com
    Subject: Avionics Mounting
    Good Evening John, I remember that I did document the installation quite thoroughly, but I can't find the pictures! May I suggest that you check the RadioRax website to see what they look like? _www.radiorax.com_ (http://www.radiorax.com/) Meanwhile, I will try to have one of my children help me find the lost images! Happy Skies, Old Bob AKA Bob Siegfried Ancient Aviator Stearman N3977A Brookeridge Air Park LL22 Downers Grove, IL 60516 630 985-8503 In a message dated 3/30/2007 4:49:57 P.M. Central Daylight Time, john_rv10@yahoo.com writes: Hi Bob, Do you have any photos of your install that you could send to me? Thank you, John Cleary ************************************** See what's free at http://www.aol.com.




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