Mailing List flyrotary@lancaironline.net Message #63576
From: Ernest Christley <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: fuel consumption gauge
Date: Thu, 27 Jul 2017 14:43:33 +0000 (UTC)
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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’ll 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/
>>> 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
>>>
>>> ---
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>>>
>>>
>>> --
>>
>>
>> --
>
> --


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