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bkbrown(at)minetfiber.com
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 Posted: Fri Apr 09, 2010 8:19 pm Post subject: To Magento - Or Not To Magento |
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As I noted on my earlier post, if you'll contact Larry Vetterman, he'll give
you the rundown on his experiences running the G3 over two years. I'm
pretty sure he did a writeup on his test results and posted it on VAF. He
was a "beta tester" for G3 if I recall. I remember that a measurable
reduction in fuel burn at cruise was documented, and a "much smoother
engine"...but it's been two years since I read his writeup there. Larry
does 3 leg GPS runs on almost all of his tests (you can check out his
website for some other testing he's done on fairings and stuff), he'll have
that info. One thing he told me in person was that he could easily feel the
difference in power between having the G3 system turned off (running on
stock mags) and turning it on. By the way, the magnetos used with the G3
are stock, they only have a small hole drilled in them to run a wire, no
modifications to the operation or function of the magneto. I think I've
almost talked myself into buying it...
Bob Brown
40871
Do not archive
It would be even better if they were able to do a 3 leg GPS run with
G3 enabled, followed by one with it disabled, on stock magnetos, so we
could have a real world estimate of power difference.
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scottmschmidt(at)yahoo.co
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| Posted: Fri Apr 09, 2010 10:13 pm Post subject: To Magento - Or Not To Magento |
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I have one Lightspeed III on the top and mag on the bottom and have loved the combination.
The plane starts on the first stroke and at altitude I lean the plane back and it runs smooth.
I do not have any hard data on efficiency but I do know that during my run-up I get about a 250 RPM drop on the mag and about 20 on the electronic ignition, it runs more efficient.
There was also an article in Sport Aviation maybe year or more ago that talked about how much more energy the electronic systems generated vs. the mag.
With the electronic ignition it is recommended to change the plugs every 100 hours. I find that after 100 hours they are pretty well worn.
There are trade-offs for everything.
This plane built with standard compression and two mags will be just awesome.
I am not sure about the G3 and have no experience or knowledge with it.
Scott Schmidtscottmschmidt(at)yahoo.com
From: Bob and Karen Brown <bkbrown(at)minetfiber.com>
To: rv10-list(at)matronics.com
Sent: Fri, April 9, 2010 10:18:04 PM
Subject: RE: Re: To Magento - Or Not To Magento
--> RV10-List message posted by: "Bob and Karen Brown" <bkbrown(at)minetfiber.com (bkbrown(at)minetfiber.com)>
As I noted on my earlier post, if you'll contact Larry Vetterman, he'll give
you the rundown on his experiences running the G3 over two years. I'm
pretty sure he did a writeup on his test results and posted it on VAF. He
was a "beta tester" for G3 if I recall. I remember that a measurable
reduction in fuel burn at cruise was documented, and a "much smoother
engine"...but it's been two years since I read his writeup there. Larry
does 3 leg GPS runs on almost all of his tests (you can check out his
website for some other testing he's done on fairings and stuff), he'll have
that info. One thing he told me in person was that he could easily feel the
difference in power between having the G3 system turned off (running on
stock
[quote][b]
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jcumins(at)jcis.net
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| Posted: Fri Apr 09, 2010 11:11 pm Post subject: To Magento - Or Not To Magento |
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Bob
I will be going with the 3G system that's for sure. I am looking forward to
their demo at Oshkosh also.
John G. Cumins
40864 Emp almost complete winds kit sitting on the shelf
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rleffler
Joined: 05 Nov 2006
Posts: 680
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| Posted: Sat Apr 10, 2010 4:58 am Post subject: To Magento - Or Not To Magento |
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Larry's write up can be found on his web site:
http://www.vettermanexhaust.com/
Here's the section about the G3:
Before I started the prop tests, I was very interested in the new electronic
ignition that I had seen on the web. www.g3ignition.com . I called Tom and
he agreed to install one on my 7A. I found the installation was simple for
even me as electricity and I just don't get along. I tell people that I am
so electrically challenged that I hire my neighbor to change my flashlight
batteries. Oh well, I would bet that some electronics guru can't weld
either. The hardest part of the installation was removing the Bendix mags.
and installing the post that hooks up the G3. Now after flying it almost 100
hours, here are the reasons that I really like the G3. #1. Easy to install,
even I could follow the wiring diagrams. 2. the system uses the existing
mags and if there is an electrical failure, the mags operate normally. 3.
the engine starts very well both hot and cold. 4. I can now run lean of peak
if desired whereas before my M1B, with standard mags balked at anything
beyond peak EGT. 5. I see a lower ghp with the G3 vs standard mags. 6. The
M1B engine is extremely smooth with the G3. 7. I used the expensive Champion
fine wire spark plugs(I had a set on the shelf) gapped to .021 however I
understand that an inexpensive automotive plug can also be used.
Aircraft RV-7A, IO-360 M1B 180HP standard air intake and standard crossover
system.
Test #1 Standard Mags vs. G3 ignition Hartzell Blended Airfoil prop. A
series of flights were made in this configuration and the data was compiled
and averaged. The flight data system was used for all of the following tests
as in all prior tests. The G3 is a type of system that is easily forgotten
and all it takes is to reach over and turn it off and see the difference in
smoothness.
DA 7500ft. MP 22.7 RPM 2400 OAT 45.1 GPH 9.1 IAS 166mph TAS 189mph EGT #1
1387 #2 1358 #3 1370 #4 1340. G3 ignition OFF
DA 7500ft MP 22.7 RPM 2400 OAT 45.1 GPH 8.9 IAS 168mph TAS 191mph EGT #1
1400 #2 1372 #3 1377 #4 1345. G3 ignition ON Note: The G3 will allow a
higher peak EGT which allows a fuel savings.
Tests were also conducted at 10,500DA and the important data shows 20.9 MP
2400RPM at 50 degrees rich of peak the IAS 158 TAS 186 9GPH while 50 degrees
lean of peak yields IAS 154 TAS 182 8GPH. G3 ignition on.
In every test conducted with both props, there is a definite engine
smoothness noted with the G3 on vs operating in the standard mag mode.
--
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_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler |
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Sat Apr 10, 2010 6:25 am Post subject: To Magento - Or Not To Magento |
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Thanks for extracting that write-up Bob. Good info. Anyone know of
similar comparison for Lightspeed vs mags? Obviously not as easy to
compare since hardware has to be changed.
On Sat, Apr 10, 2010 at 6:00 AM, Bob Leffler <rv(at)thelefflers.com> wrote:
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Kelly McMullen
A&P/IA, EAA Tech Counselor
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