X-Virus-Scanned: clean according to Sophos on Logan.com From: "Neil Unger" Received: from mail-pg0-f51.google.com ([74.125.83.51] verified) by logan.com (CommuniGate Pro SMTP 6.2c3) with ESMTPS id 9952240 for flyrotary@lancaironline.net; Thu, 27 Jul 2017 17:34:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.83.51; envelope-from=12348ung@gmail.com Received: by mail-pg0-f51.google.com with SMTP id 123so102830757pgj.1 for ; Thu, 27 Jul 2017 14:34:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language; bh=PcORT/yFgyp3piNHsI59wRW/KhmrFMqFWuwmOd0AlsI=; b=TydZ3XiPUnmNlkOd8hoa+b/5DXTwF/lZrHGJy+EwMB2Ma/Gz20TntMRmPRP3uWRhEy nG+r5mA1Ej5E+egq0UmZqDYXvXzBt14IUM1aj5OKscvtnxtvafcPA/UzewKliezDpqx2 ZoiN69oZwiKrXBuZWMVfCpCPgFBEkK/DDHZOq3GfEJBugO8liuXZKxzSol71gH4zRzaQ 13AuVUa9lmgazarwW1Fe+Zq30RCONHJTEu9/NPG0zei1phx1h+YeGtE2SGKOjJvChJ1W DM1ScatV6LggMcaACcs8U37VioDxQYlQx/qi31PXmycLGuIR2/rbqvgGeGbsB3DNFwmL Galw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=PcORT/yFgyp3piNHsI59wRW/KhmrFMqFWuwmOd0AlsI=; b=FEmhgQTVKN/QKpCL1R4n0HrHnnhbu6qoC4ZTrgB/GXas0EvdsPkvM2nJYtVCNqwUY8 XZ4tC/sNNKvl4/XzHOqgChQWMqp6DAvFo8fb8gvq7mdHsCvMnyoCye5tq7ehYE0sRms6 mRGI4q3y8GiBKJYK3K26i7jxxnVWhfCgG/o10kkDdYnKbSrN0UM38naTytTA0uGsGk+P flu7Ln6kphrNvg4DhKni1fSsls+bZSyB75UzTNGSOcq2QxZkj1DsXAw24GaanxplwraR m598kzHDufVIjay6HVecjCeBmPmpr+EZAcb+DGt4s3dVuOAky20FejnDr8vVbrHiUAAr 64uw== X-Gm-Message-State: AIVw111hN0ISHiq7lDXCZFz86yjpjGo1wP0ai2Fyr8VF5Jpr1wD/1wID 5DDT3JuMKnQEcA9GWZw= X-Received: by 10.99.42.216 with SMTP id q207mr5453546pgq.298.1501191261979; Thu, 27 Jul 2017 14:34:21 -0700 (PDT) Return-Path: <12348ung@gmail.com> Received: from [192.168.0.101] ([103.198.24.78]) by smtp.gmail.com with ESMTPSA id l27sm36091976pfi.182.2017.07.27.14.34.19 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 27 Jul 2017 14:34:20 -0700 (PDT) Subject: Re: [FlyRotary] Re: fuel consumption gauge To: Rotary motors in aircraft References: Message-ID: <557e4b51-13e3-4f69-ae6c-78984aeab024@gmail.com> Date: Fri, 28 Jul 2017 07:33:18 +1000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------35EEF5467D4774579E4FD130" Content-Language: en-US This is a multi-part message in MIME format. --------------35EEF5467D4774579E4FD130 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Thanks for that ED. Neil. On 7/27/2017 10:30 PM, Ed Anderson wrote: > Hi Neil, > > If not interested in fuel total then attached here is my revised > drawing of Tracy's Fuel Flow meter that when calibrated is > surprisingly accurate. > > If building your own microprocessor to do same, the only thing I can > think of you may need to keep in mind is that the fuel flow before > staging is only 1/2 (approx) the fuel flow after staging to all 4 > injectors. > > Ed > > -----Original Message----- From: Neil Unger > Sent: Thursday, July 27, 2017 5:11 AM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: fuel consumption gauge > > ED, Quantity is not really my interest, I am more interested in just > what the engine is using at that time, so I can get best range, plus I > am interested in just how much I am spending at full noise. Thanks Neil. > > > On 7/27/2017 8:58 AM, Ed Anderson wrote: >> Tracy had such a function in his EM system and I had one in the EFISM >> I once sold. Both calculated the fuel flow (and quantity used) based >> on the duration of the injector pulses. The flow rate was basically >> the instantaneous pulse duration, while integration of the pulse >> durations over some time period gave you the total fuel used. >> >> Since electronic injectors are essentially constant flow devices (at >> any constant fuel pressure) , if you know how long its open then you >> can calculate the two factors. It could be very accurate. And of >> course measuring millisecond pulses with a microcontroller that >> measures down to microseconds, you can understand why the results >> were so good. >> >> Tracy also came up with a quite simple and suprisingly accurate fuel >> flow indicator using basically a capacitor and LCD meter. With the >> correct capacitance, the amount of voltage that the pulse could >> charge the capacitor could be read out on the LCD meter as >> gallons/hour flow. I built several and was surprised at how accurate >> they could be once calibrated. But, they did not provide quantity >> which is apparently your interest. >> >> >> Ed >> >> -----Original Message----- From: Neil Unger >> Sent: Wednesday, July 26, 2017 5:58 PM >> To: Rotary motors in aircraft >> Subject: [FlyRotary] fuel consumption gauge >> >> 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 >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html --------------35EEF5467D4774579E4FD130 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

Thanks for that ED.   Neil.


On 7/27/2017 10:30 PM, Ed Anderson wrote:
Hi Neil,

If not interested in fuel total then attached here is my revised drawing of Tracy's Fuel Flow meter that when calibrated is surprisingly accurate.

If building your own microprocessor to do same, the only thing I can think of you may need to keep in mind is that the fuel flow before staging is only 1/2 (approx) the fuel flow after staging to all 4 injectors.

Ed

-----Original Message----- From: Neil Unger
Sent: Thursday, July 27, 2017 5:11 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: fuel consumption gauge

ED,  Quantity is not really my interest, I am more interested in just
what the engine is using at that time, so I can get best range, plus I
am interested in just how much I am spending at full noise.  Thanks Neil.


On 7/27/2017 8:58 AM, Ed Anderson wrote:
Tracy had such a function in his EM system and I had one in the EFISM I once sold.  Both calculated the fuel flow (and quantity used) based on the duration of the injector pulses.  The flow rate was basically the instantaneous pulse duration, while integration of the pulse durations over some time period gave you the total fuel used.

Since electronic injectors are essentially constant flow devices (at any constant fuel pressure) , if you know how long its open then you can calculate the two factors.  It could be very accurate.  And of course measuring millisecond pulses with a microcontroller that measures down to microseconds, you can understand why the results were so good.

Tracy also came up with a quite simple and suprisingly accurate fuel flow indicator using basically a capacitor and LCD meter. With the correct capacitance, the amount of voltage that the pulse could charge the capacitor could be read out on the LCD meter as gallons/hour flow.  I built several and was surprised at how accurate they could be once calibrated.  But, they did not provide quantity which is apparently your interest.


Ed

-----Original Message----- From: Neil Unger
Sent: Wednesday, July 26, 2017 5:58 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] fuel consumption gauge

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.


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