mprather(at)spro.net
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 Posted: Fri Aug 14, 2009 12:46 pm Post subject: AeroElectric-List Digest: 41 Msgs - 08/13/09 |
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How about engrave graduated markings on a tab that extends to the bottom
of the tank, an LED light source, and a CMOS camera to view the tab, and
another LCD screen on which to view the actual fuel in the tank? Would
have to mount the camera on/in something not damaged by fuel.. Aim the
camera so that you can also see tank outlet so that you can tell if you
are sucking air. Seeing is believing. Tongue only slightly in-cheek.
Matt-
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<echristley(at)nc.rr.com>
Speedy11(at)aol.com wrote:
> Geek, Nerd, or Ernest,
> I'm surprised you are willing to accept the poor excuse for fuel
> measurement we've had for the past 60 years. With your skills, I
> would have expected you to jump on this challenge and solve it.
> There must be a solution.
> Stan
But, I have solved it. I installed a capacitive fuel gauge which Jim
Weir designed and published in KitPlanes.
I have a sight gauge as backup. It has a 3/8 opening, so I don't have
to worry about foaming causing inaccuracies.
The final element of the solution is integrating the dial's reading with
my mind.
Before we can design a solution, be have to define the problem. The
problem here is that you have a tank partially full of fuel.
Measurement, by necessity is taken at a point source. That is, we
assume the amount of fuel in the tank from the level of fuel at one
specific place in the tank. When the plane is accelerated, the levels
at various points in the tank move, and the assumption is no longer valid.
You could, at the risk of complexity, compensate for this movement by
placing several gauges at several points in the tank and integrating
them.. The hard part is where to place the sensors, and how much
importance to place on each.
Another option is to note that the splashing is periodic, let the gauge
reflect that, and use the skills learned in high school chemistry class
to interpret the results.
I think the second option is more robust.
--
Ernest Christley, President
Ernest(at)TechnicalTakedown.com
TechnicalTakedown, LLC
www.TechnicalTakedown.com
101 Steep Bank Dr.
Cary, NC 27518
(919) 741-9397
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