Sounds good news waiting for further progress.
Dave G-LDVO
Sent from my iPhone
> On 19 Mar 2015, at 13:18, GRAHAM SINGLETON <grahamsingleton@btinternet.com
> wrote:
>
> Ira
> that has the potential to be a brilliant solution.
> Graham
>
> From: rampil <ira.rampil@gmail.com>
> To: europa-list@matronics.com
> Sent: Thursday, 19 March 2015, 13:05
> Subject: Europa-List: Re: Knowing the actual fuel level?
>
>
> The Europa fuel measurement options are all problematic.
>
> The original sight gauge was difficult to read and inaccurate. The sight
> gauge I installed between the seats still has two very significant problem
s.
> One: the vent for the sight tube of necessity must have some bends in the
> tubing, allowing fuel to become trapped and preventing the gauge from
> free venting. This occurs when line boys are over exuberant about
> filling up the filler neck and flooding the vent line (which I have openin
g
> into the top of the filler neck). Trapped fuel then causes the sight tube
to
> read inches low.
> Two: The curious saddle bag design of the tank allows easy, yet
> undetectable shifting of what fuel you may believe to be in the reserve
> side into the main, potentially leaving nothing for reserve. This has happ
ened
> after some gentleman macro and even after some steep turns in the
> presence of bumpy air.
>
> The capacitive measurement systems are all non-starters where we are
> fortunate to have choices in fuel (av vs. mo-gas).
>
> The remediation I have been playing with involves two honeywell pressure
> transducers at the bottom of each fuel bung feeding an Arduino with a
> touch sensitive LCD screen. Not quite finished for publication, but the
> thought is that it should provide legible, filtered, reliable fuel weight o
n
> each side, calibrated to the funky shape of the tank.
>
> Two design decisions I made in the prototype may come back to force a
> revision: I did not use differential transducers because 1) the limited
> altitude range I normally fly at would lead to a trivial error by neglecti
ng
> head space pressure (also very difficult to find gasoline-tolerant differe
ntial
> transducers), and 2) by installing the transducers at a tee in the
> bungs, there will be a small artifactual pressure drop which varies with
> fuel flow.
>
> When I finish testing, I will let you know.
>
> --------
> Ira N224XS
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=439585#439585
>
>
>
>
> Attachments:
>
> http://forums.matronics.com="http://www.matronics.com/Navigator?Europa-L
ist" target="_blank">http: &nbs//www.matronics.com/con
tribution" target="_blank">http://www.matronics.co========
=========
>
>
>
>
>
>
>
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
|