Received-SPF: pass
 receiver=logan.com; client-ip=209.85.213.46; envelope-from=rwstracy@gmail.com
Subject: Re: [FlyRotary] Re: Crickets & progress
References: <list-6054117@logan.com>
From: Tracy <rwstracy@gmail.com>
Content-Type: text/plain;
	charset=us-ascii
In-Reply-To: <list-6054117@logan.com>
Message-Id: <995EC158-E164-4377-8E6F-6B989F252FF9@gmail.com>
Date: Sun, 10 Feb 2013 08:27:27 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Transfer-Encoding: quoted-printable
Mime-Version: 1.0 (1.0)

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 fo=
r 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 di=
d not have its own display as it was intended to be used with an existing sy=
stem.   I use the EM3 for display and since it can get its O2 sensor data fr=
om the EC3 over the data link, no change was needed for the EM3.   =20

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.
>=20
> I looked into modifying the EFISM to do the same, but found the PID contro=
l supposedly necessary to precisely control the heater element of the wide b=
and sensor to be much more complex than simply extending the voltage range t=
o interpret the WB output.  Did you embed any PID control elements in the EC=
3 for temperature control - or just accepted any small? error associated wit=
h temp variations?
>=20
> Ed
>=20
> --------------------------------------------------
> 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
>=20
>> Not much new here either but have a few squawks & details to report.
>>=20
>> The AeroTurbine muffler has about 15 hours on it and still working well b=
ut I do see a loose piece of SS inside.  No danger of it clogging things up s=
o leaving it to disintegrate.
>>=20
>> 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 th=
an a linear sensor in that it's full range of output occurs over a very narr=
ow 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 r=
esults 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 ba=
nd sensors work at,  It is not possible to get as good fuel economy in close=
d loop as you can by carefully tweaking the mixture in open loop when in cru=
ise.  The difference is not large (about .3 GPH) but enough to make me want b=
etter.
>>=20
>> 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. $15=
0.00 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 ri=
ch 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  t=
ype 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.
>>=20
>> Both the Renesis in the -4 and the 20B in the -8 have been wonderfully no=
n-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.
>>=20
>> Tracy
>>=20
>> Sent from my iPad
>>=20
>> On Feb 9, 2013, at 3:52 PM, Chris Barber <cbarber@texasattorney.net> wrot=
e:
>>=20
>>> I so dislike when this list goes silent.
>>>=20
>>> Phase One report:  After addressing a clogged fuel filter (ultimately re=
moving it....very small passages in the screen) I flew again on Thursday. Ju=
st a quick hop around the patch. This is sometime more an issue than it woul=
d seem at a towered field with heavy military/NASA traffic under Class B.
>>>=20
>>> No squawks and nice data log with the latest Dynon 5.1 update. Along wit=
h "Clouds Ahoy" ya get a pretty nice picture off the flight and parameters. T=
his was only the ninth flight but was more fun as I seem to be getting thing=
s sorted. Still haven't left the pattern :-)
>>>=20
>>> Chris
>>>=20
>>> Sent from my iPhone 5
>>> --
>>> Homepage:  http://www.flyrotary.com/
>>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List=
.html
>>=20
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.=
html
>>=20
>>=20
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 2013.0.2897 / Virus Database: 2639/6087 - Release Date: 02/07/13=

>>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List=
.html