From: "Neil Unger" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: fuel consumption gauge
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Thu, 27 Jul 2017 19:11:56 +1000
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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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