Yes, I have a header tank, and I'm referring to something that happens in
flight or on ground with the aircraft being level.
I understand the gravity issues pretty well, although I never thought of
checking at which level the top of the gauge is rigged. The reason why I
ask is because I'm clueless here; the system, in theory, is very simple
and could not fail. And yet...
The disturbing factor is that it also happens in reverse: there is a lag
when I fill the tank.
I will check the location of the gauge pick-up (although I'm fairly sure
it is very high), but the more I think of it, the more I'm convinced that
the top line must be not open enough, either because it is clogged, or
because the tube bends and closes itself when I put the instrument panel
in place.
I can check that by blowing the tube from the outside. I will try nthat
next time I get a chance to see my aircraft.
Serge
flyk...@wi.rr.com
Envoyé par : krnet-boun...@mylist.net
2005-05-24 12:46
Veuillez répondre à KRnet
Remis le : 2005-05-24 12:46
Pour : KRnet <kr...@mylist.net>
cc : (ccc : Serge VIDAL/DNSA/SAGEM)
Objet : Re: KR> Fuel gauge mystery
Do you have a header tank? If so, the only time you get a true reading
is in absolute level flight and then only if the top of your sight
gauge is level to or above the top level of the fuel tank. If you are
sitting on the ground, your header tank will be above your sight gauge
due to the nose up angle of the plane. This also applies in flight if
you are flying in an nose up attitude, your sight gauge will be lower
than your tank. This scenario will give you a false sense of a fuller
tank and when the fuel level drops to the level of the sight gauge then
you will notice the sudden drop as you speak of.
Mark Jones (N886MJ)
Wales, WI
Visit my KR-2S CorvAIRCRAFT Site at:
http://mywebpage.netscape.com/n886mj
----- Original Message -----
From: Serge VIDAL <serge.vi...@sagem.com>
List-Post: krnet@list.krnet.org
Date: Tuesday, May 24, 2005 3:42 am
Subject: KR> Fuel gauge mystery
> On my KR2, the fuel gauge is a plain and simple sight gauge (clear
> plastic
> tubing linked to the top and bottom of the tank).
>
> One mystery I was never able to solve is that the gauge has a lag.
> When
> the tank is amost full, it takes forever before the level drops,
> then it
> suddenly drops when the tank is about half full.
>
> I tried to increase the line diameter to an ID of 6.35 mm (1/4"),
> to no
> avail.
>
> Do you think that a bend-down on the top tube could explain that?
>
> The only other explanation I could find would be that the top
> connexion to
> the tank would be clogged.
>
> Serge Vidal
> KR2 "Kilimanjaro Cloud"
> Paris, France
> _______________________________________
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