X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=HLeBLclv c=1 sm=1 tr=0 a=EmBPEBpMjP/3QNnZKm4stQ==:117 a=x7bEGLp0ZPQA:10 a=xXDCcK6TKBsA:10 a=7mUfYlMuFuIA:10 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=eRLigfuSAAAA:8 a=OMpvz8NHx7w2ETpHDuMA:9 a=QEXdDO2ut3YA:10 a=cP8SnErO_8wSdWirtHQA:9 a=Ss_ijCJzJZPHXfd0:21 a=Urk15JJjZg1Xo0ryW_k8:22 a=BfhXYjFvZD4iae-mNffo:22 From: "Todd Bartrim bartrim@gmail.com" Received: from mail-ed1-f54.google.com ([209.85.208.54] verified) by logan.com (CommuniGate Pro SMTP 6.2.5) with ESMTPS id 11292925 for flyrotary@lancaironline.net; Sat, 23 Jun 2018 05:33:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.208.54; envelope-from=bartrim@gmail.com Received: by mail-ed1-f54.google.com with SMTP id t3-v6so2554112eds.3 for ; Sat, 23 Jun 2018 02:33:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=D4PYetRnB+anLNIxevwhZH3QuBsWBVT5sjgYmgrqaVE=; b=ECvuGWnbmGVE+33po58jmx6+DbGessn2hhgVb6mBTub+4lty0VzQO1gl1vMArOIUDC KX2201HET1VYKW+jgsElzH7Qs6feNkqm4EYRYeai7fI5OhXgSEe/1k+Jzk0/tR7/UUik d1EqSLdd4cHGLkDy4frJLtyIiqvmPWbhszBEI4pqVNOKJKeB6Kh/3H5zdizlLUm3D2ck FF+7/BUomX7qROxP5tZSu3CH9e8oHvcBt1La0PsEmN9MvMDjP+embCBCfHEqX9NdjX5I wk4eXnmNoIvU2O4I1RPVkxjS1MAYl0XFaYPl8HTh8pjqShsXRNLtlGfsLil0Qar8GKBE xqzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=D4PYetRnB+anLNIxevwhZH3QuBsWBVT5sjgYmgrqaVE=; b=V0Jv3nv/OT+rHC4/0ZJrMzKHpHVOT2CtkqV3EqwyBt3/0YvSpOHBopJl0QCwt/Qfaj bUm/toCYFKv5YRBTETXXGHE2vxJ2P2aJlhI3pUrBamRJ8Fse+ZqzjGqPVQtHaVj6KuFJ ec8wy0b5Uxj/dKN6bv8z+pHJlkB4APZkzMQmbVmKS4nSnX6mtkdT4S/a4t6W2wadjrTZ Fx572zngbgFng8wTjfA1aLIlLbRfXr1L4/oMwBQfD4jBH5Us1xwp7G5qTfRxynW096dp sXdop8EcU4z4JdC9M5IiU7Akhd6BLTkvObqdY17ui7gM36BF9XjG890fkeOk4/wVmmsu PnzQ== X-Gm-Message-State: APt69E39z4PVfBaVXNc6FhV4y7DE+a5JgZQmUXvJWNotIc3CaeaNk0c1 38JG2eVBPnoYD4vXmXZZy/Ej6RYpjFFJURSUAA== X-Google-Smtp-Source: ADUXVKI7Y6LDyPE9rfJiZiWR18TSkrN+NPfR5FvaM28YdY9eOGa/KX2keYcxvPubaD8ljVLdhfCv2kzyO8aENENghA8= X-Received: by 2002:aa7:c147:: with SMTP id r7-v6mr4726040edp.143.1529746406925; Sat, 23 Jun 2018 02:33:26 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Sat, 23 Jun 2018 02:33:13 -0700 Message-ID: Subject: Re: [FlyRotary] Re: Re. Rescaling the EM2 to metric To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="0000000000002e69f4056f4bd738" --0000000000002e69f4056f4bd738 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Ok, as I can never leave well enough alone, I took another look at this. First as soon as I took a moment I realized that the J&K thermocouple would be real easy to calibrate and convert to metric. I used a Fluke temperature calibrator with a millivolt output to simulate the TC"s. Worked like a charm. I tried to use the same calibrator to simulate the variable resistance of the VDO probes, but they are thermistors which are very non-linear, so even with the tables it was a challenge. So I brought home a Fluke 9009 dual dry block temperature calibrator. Good for -20=C2=B0C up to 350=C2=B0C at the same time (separate temp wells)= . That made it easy, fast and very accurate. However, the one that I'm worried about is the OAT as this one is also used to calculate TAS, HP, and "other readings". Now I believe I can correct the TAS by calibrating the scale factor on the airspeed in flight against the TAS on my Dynon. HP is an arbitrary number anyways based on what I think my max HP should be. I think I can tweak that factor as well to get it back to what I think it should be. And if I ever meet a Dyno I'll be sure to try to calibrate it properly. But the manual also mentions "other readings" without details. So I've put in an email to Tracy. If it turns out to be important, I can always put this one back and just ignore the OAT. (Its also on the Dynon) So if any of you metric blokes down under would like to do this, I can post all the parameters which you can input to your own EM2 and it will get you close. For very accurate calibration you would have to tweak them a bit using a temperature calibrator. Todd On Fri, Jun 8, 2018, 00:46 Todd Bartrim bartrim@gmail.com, < flyrotary@lancaironline.net> wrote: > Hi Andrew; > I haven't spent much further time on the metric conversion. I think it > wouldn't be as simple as I hoped. It was fairly straight forward to conve= rt > the fuel level to litres and most of the temp measurements should be almo= st > as easy, but the K & J thermocouples have different raw data, that I don'= t > believe would be easy to convert. And then some of the calculated > parameters will likely be adversely affected as well. Probably not > impossible, but first, I just don't have the time and second, I would > probably have to be bugging Tracy a lot for info and he's busy being > retired in the mountains of Colorado where he seems to be online only > occasionally. > I have however longed for a data-logger which the early EM2 didn't hav= e > (I have #003). With the increasing popularity of hobby microcontrollers I > can get a Ardurino microcontrollers for $35 and a datalogger for it for $= 6, > so I just asked Tracy about the possibility of harvesting data from the E= M2. > However for a few other reasons, I'm considering that next time someone > on the list is selling an EM3 from an abandoned project, I might buy it f= or > an upgrade. I think there was one recently but it was bought up right awa= y. > > Todd Bartrim > > On Thu, Jun 7, 2018 at 7:58 PM, Andrew Martin andrew@martinag.com.au < > flyrotary@lancaironline.net> wrote: > >> Todd, did you ever get the EM2 recalibrated to metric? I never attemped >> this as doing so usually gives me quite a few hours work to get back to = a >> working system. I used Tracy=E2=80=99s factory calibration in the EM2 as= the base >> to calibrate my efis, which is in metric. It is a minor inconvienience t= o >> do the mental arithmetric when comparing instruments, but would be >> interesting to know if you succeeded. >> -- >> Regards Andrew Martin Martin Ag >> > > --0000000000002e69f4056f4bd738 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Ok, as I can never leave well enough alone, I took another look at th= is.
=C2=A0 First as soon as I took a moment I realized that the = J&K thermocouple would be real easy to calibrate and convert to metric.= =C2=A0
=C2=A0 I used a Fluke temperature calibrator with a milliv= olt output to simulate the TC"s. Worked like a charm.=C2=A0
= =C2=A0 I tried to use the same calibrator to simulate the variable resistan= ce of the VDO probes, but they are thermistors which are very non-linear, s= o even with the tables it was a challenge.
=C2=A0 So I brought ho= me a Fluke 9009 dual dry block temperature calibrator. Good for -20=C2=B0C = up to 350=C2=B0C at the same time (separate temp wells).
=C2=A0 T= hat made it easy, fast and very accurate.=C2=A0
=C2=A0 However, t= he one that I'm worried about is the OAT as this one is also used to ca= lculate TAS, HP, and "other readings".
Now I believe I = can correct the TAS by calibrating the scale factor on the airspeed in flig= ht against the TAS on my Dynon.
HP is an arbitrary number anyways= based on what I think my max HP should be. I think I can tweak that factor= as well to get it back to what I think it should be. And if I ever meet a = Dyno I'll be sure to try to calibrate it properly.=C2=A0
=C2= =A0 But the manual also mentions "other readings" without details= .
So I've put in an email to Tracy.
If it turns out= to be important, I can always put this one back and just ignore the OAT. (= Its also on the Dynon)
=C2=A0 So if any of you metric blokes down= under would like to do this, I can post all the parameters which you can i= nput to your own EM2 and it will get you close.
=C2=A0 For very a= ccurate calibration you would have to tweak them a bit using a temperature = calibrator.=C2=A0

Todd

On Fri, Jun 8, 2018, 00:46 Todd Bartrim bartrim@gmail.com, <flyrotary@lancaironline.net> wrote:<= br>
Hi Andrew;
=C2= =A0I haven't spent much further time on the metric conversion. I think = it wouldn't be as simple as I hoped. It was fairly straight forward to = convert the fuel level to litres and most of the temp measurements should b= e almost as easy, but the K & J thermocouples have different raw data, = that I don't believe would be easy to convert. And then some of the cal= culated parameters will likely be adversely affected as well. Probably not = impossible, but first, I just don't have the time and second, I would p= robably have to be bugging Tracy a lot for info and he's busy being ret= ired in the mountains of Colorado where he seems to be online only occasion= ally.
=C2=A0 =C2=A0I have however longed for a data-logger which = the early EM2 didn't have (I have #003). With the increasing popularity= of hobby microcontrollers I can get a Ardurino microcontrollers for $35 an= d a datalogger for it for $6, so I just asked Tracy about the possibility o= f harvesting data from the EM2.
=C2=A0 However for a few other re= asons, I'm considering that next time someone on the list is selling an= EM3 from an abandoned project, I might buy it for an upgrade. I think ther= e was one recently but it was bought up right away.

Todd = Bartrim

On Thu, Jun 7, 2018 at 7:58 PM, Andrew Marti= n andrew@martin= ag.com.au <flyrotary@lancaironline.net> wrote:=
Todd, did you ever get= the EM2 recalibrated to metric? I never attemped this as doing so usually = gives me quite a few hours work to get back to a working system. I used Tra= cy=E2=80=99s factory calibration in the EM2 as the base to calibrate my efi= s, which is in metric. It is a minor inconvienience to do the mental arithm= etric when comparing instruments, but would be interesting to know if you s= ucceeded.
--
Regards Andrew Martin Martin Ag

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