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  #1  
Old 03-08-2013, 07:26 AM
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Kahuna Kahuna is offline
 
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Location: Gold Hill, NC25
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Default GRT, flow matching nozzles, and the power of integrated vendors

About 7 years ago I did an article on flow matching fuel injection nozzles. It has received a lot of attention over the years. Many have referred to it. Flow matching is simply getting your injectors matched IN THE PLANE during normal operations. I wont go into the details of that, its been written about extensively and included in the article above.
Back then about the best we had was an engine monitor that had the data, you just had to write it down, or download it & get it into a spreadsheet. Then it took some excel skills to get then information you needed.

Fast forward to today. I removed my AFS engine monitor and went to a GRT EIS and EFIS integration a few months back. One of the many things companies struggle with is, what do I do myself, and what can others do better. There is a cool FREE service on the web called SavvyAnalysis. They take your data file that you upload, and present it in a way that even an idiot can understand graphically. This only happens due to 2 companies getting together and sharing information.

So I take a recording of my GRT data while leaning the motor. A simple couple of buttons to record a demo file while flying and a USB stick in the panel. Come home. Throw the stick in the computer, Jump on a web browser, upload it to SavvyAnalysis, and whammo, I get this cool plotting diagram.


Taking this data, I noticed I now have a .5gph spread across the nozzles at peak. It was .1gph 1500 engine hours and 7 years ago. No idea why, but Ill figure it out and deal with it. Not the point of this message.

The point of this message is how we get to use the cool systems we have, some technology on the web, and some companies getting together to bring a very useful tool to us.

You want to play with this yourself? You can. Go to www.savvyanalysis.com, create your free account. Create your plane and profile, Grab my GRTDemoFile and save it locally to your computer. Then upload the file to Savvy and preview it. You can play with all kinds of stuff they have and see what it does. Pretty neat stuff. Enjoy
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  #2  
Old 03-08-2013, 07:59 AM
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KatieB KatieB is offline
 
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Location: Belton, MO
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Default That's cool!

Thanks for sharing your log file, Kahuna. That's pretty neat stuff. I would have used Savvy Analysis a lot if I'd have known about it when I used to do test flying for Jabiru and Arion. It looks like it would beat writing EGT & CHT numbers on a note pad and taking photos of the EIS/EFIS engine graphs!
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  #3  
Old 03-08-2013, 09:48 AM
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Default

I'm totally with you on the advantages of keeping track of your injector balance as you lean. It's why the Dynon EMS systems show you the flow spread from first to peak vs last to peak every time you lean, right on the screen (and have since 2006).

Also, as a general note, SavvyAnalysis supports GRT, Dynon, AFS, and Garmin, so this is not a capability limited to only GRT users.

--Ian Jordan
Dynon Avionics
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  #4  
Old 03-08-2013, 09:52 AM
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Default

Quote:
Originally Posted by Kahuna View Post
Taking this data, I noticed I now have a .5gph spread across the nozzles at peak. It was .1gph 1500 engine hours and 7 years ago. No idea why, but Ill figure it out and deal with it. Not the point of this message.
You dog.....ya can't throw that up there and expect us to ignore it

Still have the 0.1 spread across five of the six. Got a best guess about that one cylinder peaking late?
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  #5  
Old 03-08-2013, 09:59 AM
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Dan,
You can swap nozzles and see if it tracks the nozzle or the cylinder. This will tell you if it's a nozzle issue or something else like limited airflow to the cylinder, excessive backpressure, etc.

--Ian
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Old 03-08-2013, 10:13 AM
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Ken Harrill Ken Harrill is offline
 
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Default

Quote:
It's why the Dynon EMS systems show you the flow spread from first to peak vs last to peak every time you lean, right on the screen (and have since 2006).
Yes, this is great information on the Dynon engine monitor. It is real time and very useful when running LOP with my carbed engine.
I have been using Mike Busch's Savvy Analysis with the Dynon engine log since it became available. Thanks to Mike Busch and Dynon.
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  #7  
Old 03-08-2013, 10:22 AM
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Kahuna Kahuna is offline
 
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Quote:
Originally Posted by DanH View Post
You dog.....ya can't throw that up there and expect us to ignore it

Still have the 0.1 spread across five of the six. Got a best guess about that one cylinder peaking late?
No not really. And when I took this recording I was just playing around. 3k', 18"mp loafing around etc. Was not dong it to actually log LOP flowing. Im gonna go do a controlled test for that purpose and capture a few times and see what I have. It does raise questions that needs answers. right now I dont even have a clue. My head is full answers of why cly's get leaner, but thoughts around richer elude me right now.
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Old 03-08-2013, 10:50 AM
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Bubblehead Bubblehead is offline
 
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Default Savvy is a great product

Just a couple of nights ago I downloaded data from SkyView (can do that now) and uploaded it to Savvy and worked through the manual. What a great tool! Very friendly, very powerful, and it helped me compare several flights quickly to see what had changed.
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  #9  
Old 03-08-2013, 11:26 AM
Bavafa Bavafa is offline
 
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Default

Oh, this is so awesome and thanks for sharing. I am going to get a new demo today/tomorrow to see where my spread is in relation to FF. I did my injectors the manual way (writing it in a spreadsheet) and sending it to Don and he came up with a minor mod to two of the injectors.

Cheers
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  #10  
Old 03-08-2013, 08:50 PM
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Nice tool. I'll surely try it out.

BTW, I'm willing to bet a beer at SnF that at your chart is showing a flow divider effect.
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