From: "Stephen Izett" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: fuel consumption gauge
Date: Fri, 28 Jul 2017 07:38:54 +0800
References: <list-9951135@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-9951135@logan.com>
Message-Id: <2AADFF0A-4C38-4562-AA05-038995B0CB7A@icloud.com>

Thanks very much Steve
Your reminding me of reality. Even small projects can take so long to =
get finished!
I=E2=80=99ve often tried to save money and its cost so much more time =
and money than I thought.
Cheers
Steve Izett

> On 27 Jul 2017, at 11:38 pm, Steven W. Boese =
<flyrotary@lancaironline.net> wrote:
>=20
> Steve,
> I used the Texas Instruments Launchpad development kit for the fuel =
flow device.  The programming board and two imbedded microprocessors =
cost $5.00 at the time.  The software was downloaded at no cost.  =
Additional hardware was needed but the cost was minimal.
>=20
> The flow vs. time characteristic for the fuel injectors is linear with =
a non-zero intercept.  This can be used in the microprocessor =
calculation.  Different sized primary and secondary injectors can be =
accommodated by using the corresponding characteristics.  The fuel flow =
indicated by a simple conversion of pulse width to voltage will be most =
accurate only at the condition under which the calibration was developed =
although the result may very well serve your purpose.
>=20
> I scaled the variables so as to use integer arithmetic with the =
MSP430G2211 and MSP430G2231 chips that came with the Launchpad kit.  The =
device I built indicates RPM, staging condition, fuel flow rate, and =
fuel remaining in each of my two wing tanks.
>=20
> The requirements for building an accurate and dependable instrument =
can be avoided by installing the single flow sensor connected to your =
Dynon.  It just depends on what you want to spend your time and effort =
on.
>=20
> Steve Boese
>=20
>> On Jul 26, 2017, at 10:43 PM, Stephen Izett =
<flyrotary@lancaironline.net> wrote:
>>=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 =
<flyrotary@lancaironline.net> 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 =
<flyrotary@lancaironline.net> wrote:
>>>>=20
>>>> 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:
>>>>>=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
>>>>> ---
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>>=20
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