AND....btw you can sort of make the endurance problem go away with an
auxiliary tank. Then you have 5 hours which is definitely more than I want
to spend in a Europa and far more endurance than my internal tank.
Colombia to USA flew two up with the main and aux tank full plus ipads
spare radio, tools and clothes at about 50lbs over MTOW and well within
W&B. Only on the Medellin Panama leg did we come close 3:46, 408 nm and we
landed with a little over 5 gals.
I like to fly with more than enough fuel to take unforeseen events into
account. The extra fuel was certainly comforting.
William Daniell
LONGPORT
+1 786 878 0246
On Tue, Mar 9, 2021 at 12:49 PM Pete <peterz@zutrasoft.com> wrote:
> As per my original reply, i added an equivalent pitot feeding the static
> port of the belite sensor on both aircraft. Easypeasy and works great. Fu
el
> rated sensor. Quite accurate. Satisfied with both.
>
> Fwiw,
> Cheers,
> Pete :-)
>
>
> > On Mar 9, 2021, at 12:09 PM, h&jeuropa <butcher43@att.net> wrote:
> >
att.net>
> >
> > Pete,
> >
> > The problem with the BeLite probe is that it is not a differential
> pressure transducer. The tank vent faces into the airstream and
> pressurizes the tank. The amount of pressure varies with airspeed. Whil
e
> the amount of pressure from the vent is small, the weight of fuel is also
> quite small. This will affect the calibration.
> >
> > I have been using this method of measuring fuel level for many years.
I
> started with the system Tony K from NZ published around 2000. Tony
> specified a differential pressure transducer. Over the years I have
> upgraded with newer transducers. After one of my upgrades I couldn't
> figure out why the calibration in flight was different than that on the
> ground until I realized about the vent pressure. Changing to a
> differential transducer solved the problem. I am currently using
> MPXV4006DP transducers. Since they are not rated for fuel, I use a loop
of
> tubing to force a column of air between the transducer and the liquid.
> >
> > I agree with Will Daniell, having a tank sensor is not terribly useful.
> Since the Rotax only uses about 5 gph, you need accuracy of 1 gal to judg
e
> 12 minute endurance. That's difficult. The better solution is to use t
he
> "main" tank and as it gets low, monitor fuel pressure. When fuel pressur
e
> starts to drop, switch tanks. You can easily do this, especially with an
> EFIS, and the engine won't miss a beat. Then you have the 3 gal in the
> reserve side, roughly 30 minutes to land.
> >
> > As always, just my opinion and experience.
> >
> > Jim Butcher
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=500907#500907
> >
> >
> >
> >
> >
> >
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