X-Virus-Scanned: clean according to Sophos on Logan.com From: "Stephen Izett" Received: from mail-pg0-f41.google.com ([74.125.83.41] verified) by logan.com (CommuniGate Pro SMTP 6.2c3) with ESMTPS id 9950968 for flyrotary@lancaironline.net; Thu, 27 Jul 2017 10:46:08 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.83.41; envelope-from=steveize@gmail.com Received: by mail-pg0-f41.google.com with SMTP id v190so98942822pgv.2 for ; Thu, 27 Jul 2017 07:46:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:mime-version:subject:date:references:to:in-reply-to:message-id; bh=2BagGrWtvI5xeXS4o+pO7l6JK0uAioHIXd93GWuq1Hc=; b=pDqdOe0Tax33gI7q1IPQ7oc3Gl7K3X2eiepMKqNtg4XNrmtilbm4DcPuFdPx8M8h8P 72iTjz88fMe0K3m/Yx3sQZerKeq37H7U+aYLm0gAQ3UPe/K16IihotJRdGpTmO94L0re l7NyAxtKsX2quTEvmbEPAMu5adtponWlcmYUA8nZlT75+xt+JiYJAFXVWO/hMHQs4Np+ iHfhm7e/aN7UdOcrVhrz08kfcZqp9Id1MEVo9YaO3QsE5pEEG/Sb8caVKTgykWVTSaX1 uVU7ZBDwVeWe0cbp2qa5xoOBiRYQsyYEjTD1S9yKFtbUsnREY72I+57yPL47DdfQXxrc cZeg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:mime-version:subject:date:references:to :in-reply-to:message-id; bh=2BagGrWtvI5xeXS4o+pO7l6JK0uAioHIXd93GWuq1Hc=; b=RpiJtROpXnK9Rv0jIQYyJbACWNmc0kU32KSkBccdn11wZSj5+XYEBC5xva45sDsUtK Ihw+j3k6M+cTncVjCb/vpQmZwJGWhw5Y0lg4baGPxyS+CqyuG1r8sZ588kQSyoCoNeiv XxeaXmlsr7haD2GAMewsZVphtHOuCY8TMlTaulRCZU/et0Kxlkq+hLYIRluksg49RDLf mvWNFV8Ml3VJoTYM0hHO2xTABOGeMQ/PqPP9I7coPTSVi7GFGuWPGMm1DzpG2FbVXCbv OGyS1iIMGy5x2D3Cgf1I20uaDf5Awv4B8rMaZWfSz9SEQD7GMwsP4o4dnsfQuPpXZm5y vLZw== X-Gm-Message-State: AIVw112IWxPJs2fMb22e32JIOQCrxMwQ+zwlJQ2+x3LxORvaPaQDCXCM ZiWvaSieViUbhNokibc= X-Received: by 10.84.191.164 with SMTP id a33mr4630619pld.119.1501166750174; Thu, 27 Jul 2017 07:45:50 -0700 (PDT) Return-Path: Received: from [10.1.1.22] (106-68-117-221.dyn.iinet.net.au. [106.68.117.221]) by smtp.gmail.com with ESMTPSA id k85sm5009764pfj.5.2017.07.27.07.45.47 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 27 Jul 2017 07:45:49 -0700 (PDT) X-Google-Original-From: Stephen Izett Content-Type: multipart/alternative; boundary="Apple-Mail=_5A8DD3C3-EF85-423B-96B3-54ABF8CA69BE" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: [FlyRotary] Re: fuel consumption gauge Date: Thu, 27 Jul 2017 22:45:43 +0800 References: To: Rotary motors in aircraft In-Reply-To: Message-Id: <57E0D7F0-5E74-4CE9-8C96-82E11D4E19FD@icloud.com> X-Mailer: Apple Mail (2.3273) --Apple-Mail=_5A8DD3C3-EF85-423B-96B3-54ABF8CA69BE Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Thanks Steve Steve Izett > On 27 Jul 2017, at 10:43 pm, Ernest Christley = wrote: >=20 > There is a factor you need to add in for opening and closing of the = injector. That is, there is a period on each pulse where the fuel isn't = flowing fully. The tendency is to overstate the flow during partial = throttle operations when the injectors are open for shorter pulses. I = believe that discounting this effect will cause about a 10% error. >=20 >=20 >=20 >=20 > On Thursday, July 27, 2017 12:43 AM, Stephen Izett = wrote: >=20 >=20 > Thanks Steve > Rather than reroute the fuel lines I think I=E2=80=99ll build a little = processor and measure pulse widths and rpm and create a pulse stream fr = the dynon to read. > Any hints on anything to watch out for in coding? > Cheers >=20 > Steve >=20 > > On 27 Jul 2017, at 12:39 pm, Steven W. Boese = > = wrote: > >=20 > > Steve, > >=20 > > I have a single flow sensor installed in a dead headed configuration = as Charlie described as well as a flow indicator/accumulator of my own = design based on the primary and secondary injector signals. They are = both consistent and accurate. > >=20 > > Steve Boese > >=20 > >> On Jul 26, 2017, at 8:26 PM, steve Izett = > = wrote: > >>=20 > >> Thanks Charlie > >> Appreciate the info re position of regulator. > >> Steve Izett > >>> On 27 Jul 2017, at 10:08 am, Charlie England = > = wrote: > >>>=20 > >>> On 7/26/2017 4:58 PM, Neil Unger wrote: > >>>> Gents, Is anyone aware of a fuel consumption gauge that will = give fuel consumption in real time? I can get one that has two flow = meters but that makes installation complicated and not really cost = effective. I am looking for something that works off the injectors. As = usual it has to be "tweaked" with actual fuel usage. Did not Tracy have = such a system? Neil. > >>>>=20 > >>>>=20 > >>>> --=20 > >>>> Homepage: http://www.flyrotary.com/ > >>>> Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html = > >>> Just about any fuel flow instrument will work, if you design the = fuel architecture to allow it. If you place the regulator & its bypass = prior to the flow sensor & injectors, you only need one sensor. The fuel = 'dead heads' at the injectors, so it's always at full system pressure, = and in the unlikely event that there is vapor in the lines, it's = immediately blown through the injectors. It's how virtually every car is = set up these days. It's being done in a/c, too. I'm pretty sure that = Tracy has this fuel delivery architecture in the RV-8 3-rotor. > >>>=20 > >>> If you're patient, you can find Flowscan sensors & various brands = of totalizers on Ebay for very good prices. > >>>=20 > >>> Charlie > >>>=20 > >>> --- > >>> This email has been checked for viruses by Avast antivirus = software. > >>> https://www.avast.com/antivirus > >>>=20 > >>>=20 > >>> -- > >>> Homepage: http://www.flyrotary.com/ > >>> Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html = > >>=20 > >>=20 > >> -- > >> 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 > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html = >=20 --Apple-Mail=_5A8DD3C3-EF85-423B-96B3-54ABF8CA69BE Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Thanks Steve
Steve Izett
On = 27 Jul 2017, at 10:43 pm, Ernest Christley <flyrotary@lancaironline.net> wrote:

There is a factor you need to add in for opening and closing = of the injector.  That is, there is a period on each = pulse where the fuel isn't flowing fully.  The tendency is to = overstate the flow during partial throttle operations when the injectors = are open for shorter pulses.  I believe that discounting this = effect will cause about a 10% error.




=
On = Thursday, July 27, 2017 12:43 AM, Stephen Izett <flyrotary@lancaironline.net> wrote:


Thanks Steve
Rather than reroute the = fuel lines I think I=E2=80=99ll build a little processor and measure = pulse widths and rpm and create a pulse stream fr the dynon to read.
Any hints on anything to = watch out for in coding?
Cheers

Steve

> On 27 Jul 2017, at 12:39 pm, Steven W. Boese = <flyrotary@lancaironline.net> wrote:
>
> Steve,
>
> I have a single flow = sensor installed in a dead headed configuration as Charlie described as = well as a flow indicator/accumulator of my own design based on the = primary and secondary injector signals.  They are both consistent = and accurate.
>
> Steve Boese
>
>> On Jul 26, 2017, = at 8:26 PM, steve Izett <flyrotary@lancaironline.net> wrote:
>>
>> Thanks Charlie
>> Appreciate the = info re position of regulator.
>> Steve Izett
>>> On 27 Jul 2017, at 10:08 am, Charlie England = <flyrotary@lancaironline.net> wrote:
>>>
>>> On 7/26/2017 = 4:58 PM, Neil Unger wrote:
>>>> Gents,  Is anyone aware of a fuel = consumption  gauge that will give fuel consumption in real = time?  I can get one that has two flow meters but that makes = installation complicated and not really cost effective.  I am = looking for something that works off the injectors.  As usual it = has to be "tweaked" with actual fuel usage.  Did not Tracy have = such a system?  Neil.
>>>>
>>>>
>>>> --
>>>> Homepage:  http://www.flyrotary.com/
>>>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html<= br class=3D"">
>>> Just about = any fuel flow instrument will work, if you design the fuel architecture = to allow it. If you place the regulator & its bypass prior to the = flow sensor & injectors, you only need one sensor. The fuel 'dead = heads' at the injectors, so it's always at full system pressure, and in = the unlikely event that there is vapor in the lines, it's immediately = blown through the injectors. It's how virtually every car is set up = these days. It's being done in a/c, too. I'm pretty sure that Tracy has = this fuel delivery architecture in the RV-8 3-rotor.
>>>
>>> If you're = patient, you can find Flowscan sensors & various brands of = totalizers on Ebay  for very good prices.
>>>
>>> Charlie
>>>
>>> ---
>>> This email has been checked for viruses by Avast = antivirus software.
>>> https://www.avast.com/antivirus
>>>
>>>
>>> --
>>> = Homepage:  http://www.flyrotary.com/
>>> Archive and UnSub:  http://mail.lancaironline.net:81/lists/flyrotary/List.html<= br class=3D"">
>>
>>
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:  http://mail.lancaironline.net:81/lists/flyrotary/List.html<= br class=3D"">
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:  http://mail.lancaironline.net:81/lists/flyrotary/List.html<= br class=3D"">


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