X-Virus-Scanned: clean according to Sophos on Logan.com From: "Ernest Christley" Received: from sonic303-27.consmr.mail.gq1.yahoo.com ([98.137.64.208] verified) by logan.com (CommuniGate Pro SMTP 6.2c3) with ESMTP id 9950969 for flyrotary@lancaironline.net; Thu, 27 Jul 2017 10:44:14 -0400 Received-SPF: none receiver=logan.com; client-ip=98.137.64.208; envelope-from=echristley@att.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=att.net; s=s1024; t=1501166618; bh=exIHTfmiWgnNj1M9+OcS8/3pOErH0wdaPAsw2ej/MYM=; h=Date:From:Reply-To:To:In-Reply-To:References:Subject:From:Subject; b=jkFdZDhbJmADmIvdN5ejXFByRSSjUj6cBEQnMNFRw8eqX1RolBsvGJTQDI/Eejw8AIJJqw32g0lsbvY1ejODIb/0Kne3lH0NN6fUJJOpcq8KvaOC9PMHpKm6dwJXig3AjAXtY7K+V7OU3OUp8baXEOqAB5GU3L5KCsUyQ204Amk= X-YMail-OSG: ehIw47YVM1nbNzEdGoUbsvQMo5t66y1d7O2q1pH787Bm7mnsrW8FlSFe71_Hq6v UBmjJhnJdQBaXDt0CWXOUoDEyv68I4Q35g.6A21xnsjNHg4Ndg8LiIibxyO5uC5ZRkC84BV8FsQ4 M02j2uZLwgN3bUZMaojR60WAxzYr7kGMlu7JaE3.L8fEF6oTW9Mr7rxK6n9frNI6RYbeqomBTi47 ygbRDXbqfjSyASf9iJW.da11qAJsCt1Y6l_R8T_kkR8hbFprUZ4zn7nG9eO6cOWtUg4vApqmIEXq XzS9FvxXANqUUaxpC.hyZDeUbJOjGkR7UF_3DxN7Xwp8DUI7VyFgf7G1aRgFqSPzK0VZVcTrz_Wd NMC4zWz2nXCtYt7TV8h9gEmbGnVXRD5K2TWsf7H.Av40LOo0.XUvU5ZdYAK0FChqVlF0a.Ba.4IC GiXxUase.IJH.8csEF8fP_aT.JYEoANykdL54B.zldgwIGUA8gcU4OrOjculD1pwUFAs3dDxA87h V Received: from sonic.gate.mail.ne1.yahoo.com by sonic303.consmr.mail.gq1.yahoo.com with HTTP; Thu, 27 Jul 2017 14:43:38 +0000 Date: Thu, 27 Jul 2017 14:43:33 +0000 (UTC) Reply-To: Ernest Christley To: Rotary motors in aircraft Message-ID: <214707189.710612.1501166613443@mail.yahoo.com> In-Reply-To: References: Subject: Re: [FlyRotary] Re: fuel consumption gauge MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_710611_427982616.1501166613440" X-Mailer: WebService/1.1.10181 YahooMailNeo Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/603.3.8 (KHTML, like Gecko) Version/10.1.2 Safari/603.3.8 Content-Length: 11137 ------=_Part_710611_427982616.1501166613440 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable There is a factor you need to add in for opening and closing of the injecto= r. =C2=A0That is, there is a period on each pulse=C2=A0where the fuel isn't= flowing fully. =C2=A0The tendency is to overstate the flow during partial = throttle operations when the injectors are open for shorter pulses. =C2=A0I= believe that discounting this effect will cause about a 10% error. =20 On Thursday, July 27, 2017 12:43 AM, Stephen Izett wrote: =20 Thanks Steve Rather than reroute the fuel lines I think I=E2=80=99ll build a little proc= essor and measure pulse widths and rpm and create a pulse stream fr the dyn= on 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 wrote: >=20 > Steve, >=20 > I have a single flow sensor installed in a dead headed configuration as C= harlie described as well as a flow indicator/accumulator of my own design b= ased on the primary and secondary injector signals.=C2=A0 They are both con= sistent and accurate. >=20 > Steve Boese >=20 >> On Jul 26, 2017, at 8:26 PM, steve Izett w= rote: >>=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,=C2=A0 Is anyone aware of a fuel consumption=C2=A0 gauge that wi= ll give fuel consumption in real time?=C2=A0 I can get one that has two flo= w meters but that makes installation complicated and not really cost effect= ive.=C2=A0 I am looking for something that works off the injectors.=C2=A0 A= s usual it has to be "tweaked" with actual fuel usage.=C2=A0 Did not Tracy = have such a system?=C2=A0 Neil. >>>>=20 >>>>=20 >>>> --=20 >>>> Homepage:=C2=A0 http://www.flyrotary.com/ >>>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Li= st.html >>> Just about any fuel flow instrument will work, if you design the fuel a= rchitecture to allow it. If you place the regulator & its bypass prior to t= he 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 unlik= ely 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 bein= g done in a/c, too. I'm pretty sure that Tracy has this fuel delivery archi= tecture in the RV-8 3-rotor. >>>=20 >>> If you're patient, you can find Flowscan sensors & various brands of to= talizers on Ebay=C2=A0 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:=C2=A0 http://www.flyrotary.com/ >>> Archive and UnSub:=C2=A0 http://mail.lancaironline.net:81/lists/flyrota= ry/List.html >>=20 >>=20 >> -- >> Homepage:=C2=A0 http://www.flyrotary.com/ >> Archive and UnSub:=C2=A0 http://mail.lancaironline.net:81/lists/flyrotar= y/List.html >=20 > -- > Homepage:=C2=A0 http://www.flyrotary.com/ > Archive and UnSub:=C2=A0 http://mail.lancaironline.net:81/lists/flyrotary= /List.html -- Homepage:=C2=A0 http://www.flyrotary.com/ Archive and UnSub:=C2=A0 http://mail.lancaironline.net:81/lists/flyrotary/L= ist.html =20 ------=_Part_710611_427982616.1501166613440 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
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 t= endency is to overstate the flow during partial throttle operations when th= e injectors are open for shorter pulses.  I believe that discounting t= his effect will cause about a 10% error.




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


Thanks Steve
Rather than rero= ute the fuel lines I think I=E2=80=99ll build a little processor and measur= e pulse widths and rpm and create a pulse stream fr the dynon to read.
<= /div>
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 con= figuration as Charlie described as well as a flow indicator/accumulator of = my own design based on the primary and secondary injector signals.  Th= ey are both consistent and accurate.
>
> Steve Boese
>
>> On Jul 26, 2017, at 8:26 PM, steve Izett <<= a ymailto=3D"mailto:flyrotary@lancaironline.net" href=3D"mailto:flyrotary@l= ancaironline.net">flyrotary@lancaironline.net> wrote:
>>
>> Thanks Charlie
=
>> Appreciate the info re position of regulato= r.
>> Steve Izett
>>> On 27 Jul 2017, at 10:08 am, Charlie England <flyrotary@lancaironline.net> wrote:
>>>
>>> On 7/26/2017 4:58 P= M, Neil Unger wrote:
>>>> Gents, = ; Is anyone aware of a fuel consumption  gauge that will give fuel con= sumption in real time?  I can get one that has two flow meters but tha= t makes installation complicated and not really cost effective.  I am = looking for something that works off the injectors.  As usual it has t= o be "tweaked" with actual fuel usage.  Did not Tracy have such a syst= em?  Neil.
>>>>
>>>>
>>>> -- =
>>>> Homepage:  http://www.flyrotary.com/
<= /div>
>>> Just about any fuel flow instrument will work, if y= ou design the fuel architecture to allow it. If you place the regulator &am= p; its bypass prior to the flow sensor & injectors, you only need one s= ensor. The fuel 'dead heads' at the injectors, so it's always at full syste= m 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 pat= ient, you can find Flowscan sensors & various brands of totalizers on E= bay  for very good prices.
>>>
=
>>> Charlie
>&= gt;>
>>> ---
>>> This email has been checked for viruses by Avast antivirus = software.
>>>
>>>=
>>> --
>&= gt;> Homepage:  http://www.flyrotary.com/
>>
>>
>> --
>> Homepage:  http://www.flyrotary.com/
------=_Part_710611_427982616.1501166613440--