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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Crickets & progress
Date: Sun, 10 Feb 2013 09:21:26 -0500
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Makes sense to me, Tracy.  I Looked into trying to duplicate the PID control 
of the sensor temps in the EFISM and decided was just not worth it {:>).
So you basically had a kit with a sensor temp control chip and "simply" used 
the output as input to the EC3, that is clearly a more practical way to go.

Ed

--------------------------------------------------
From: "Tracy" <rwstracy@gmail.com>
Sent: Sunday, February 10, 2013 8:27 AM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Crickets & progress

> Hi Ed,
>     You're right, you can't just substitute the wideband sensor for the 
> old narrow band and have it work.  I didn't bother to modify the EC3 
> (except for the program).  I bought the Wideband sensor kit which included 
> the control electronics that conditions the output to 0 - 5 volts.    The 
> kit I used did not have its own display as it was intended to be used with 
> an existing system.   I use the EM3 for display and since it can get its 
> O2 sensor data from the EC3 over the data link, no change was needed for 
> the EM3.
>
> Tracy
>
> Sent from my iPad
>
> On Feb 9, 2013, at 6:27 PM, "Ed Anderson" <eanderson@carolina.rr.com> 
> wrote:
>
>> Great to hear about your move to the wide band O2 sensor, Tracy.
>>
>> I looked into modifying the EFISM to do the same, but found the PID 
>> control supposedly necessary to precisely control the heater element of 
>> the wide band sensor to be much more complex than simply extending the 
>> voltage range to interpret the WB output.  Did you embed any PID control 
>> elements in the EC3 for temperature control - or just accepted any small? 
>> error associated with temp variations?
>>
>> Ed
>>
>> --------------------------------------------------
>> From: "Tracy" <rwstracy@gmail.com>
>> Sent: Saturday, February 09, 2013 6:09 PM
>> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>> Subject: [FlyRotary] Re: Crickets & progress
>>
>>> Not much new here either but have a few squawks & details to report.
>>>
>>> The AeroTurbine muffler has about 15 hours on it and still working well 
>>> but I do see a loose piece of SS inside.  No danger of it clogging 
>>> things up so leaving it to disintegrate.
>>>
>>> After flying with the EC3 closed loop software for awhile I have a 
>>> better feel for how the O2 sensor responds to mixture.   Its more like a 
>>> switch than a linear sensor in that it's full range of output occurs 
>>> over a very narrow range of mixture.  Guess that's why they are called 
>>> narrow band sensors!   Anyway, it makes it a little tricky to set the 
>>> EC3 target mixture.  Best results are obtained by setting the target at 
>>> a fairly lean mixture.  Because the best fuel economy is achieved at a 
>>> mixture below which common narrow band sensors work at,  It is not 
>>> possible to get as good fuel economy in closed loop as you can by 
>>> carefully tweaking the mixture in open loop when in cruise.  The 
>>> difference is not large (about .3 GPH) but enough to make me want 
>>> better.
>>>
>>> After seeing this, I decided to experiment with a wideband sensor. 
>>> They have come down in price so even penny pinchers like me can afford 
>>> them. $150.00 range.  They typically put out a voltage between 0 & 5 
>>> volts instead of 0 to 1 volt like narrow band does.   The polarity is 
>>> opposite as well so rich mixture is at low end of range instead of high. 
>>> With the latest version of the software (after Feb 2013) you can now 
>>> setup the EC3 to use either  type sensor.   With the wideband sensor it 
>>> is much easier to target the exact mixture you want and to achieve the 
>>> best fuel economy in closed loop.
>>>
>>> Both the Renesis in the -4 and the 20B in the -8 have been wonderfully 
>>> non-eventful.
>>> I'm always amazed at how long the apex seals take to fully seat in. 
>>> The 20B cranking speed compression is still improving after 120 hours. 
>>> The 13B was at around 250 hours when it reached maximum.
>>>
>>> Tracy
>>>
>>> Sent from my iPad
>>>
>>> On Feb 9, 2013, at 3:52 PM, Chris Barber <cbarber@texasattorney.net> 
>>> wrote:
>>>
>>>> I so dislike when this list goes silent.
>>>>
>>>> Phase One report:  After addressing a clogged fuel filter (ultimately 
>>>> removing it....very small passages in the screen) I flew again on 
>>>> Thursday. Just a quick hop around the patch. This is sometime more an 
>>>> issue than it would seem at a towered field with heavy military/NASA 
>>>> traffic under Class B.
>>>>
>>>> No squawks and nice data log with the latest Dynon 5.1 update. Along 
>>>> with "Clouds Ahoy" ya get a pretty nice picture off the flight and 
>>>> parameters. This was only the ninth flight but was more fun as I seem 
>>>> to be getting things sorted. Still haven't left the pattern :-)
>>>>
>>>> Chris
>>>>
>>>> Sent from my iPhone 5
>>>> --
>>>> Homepage:  http://www.flyrotary.com/
>>>> Archive and UnSub: 
>>>> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>>
>>> --
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>>>
>>>
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>>
>> --
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>
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>
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