Hey, I just thought of a much cheaper and "noninvasive" approach.
Anyone with a penchant for cobbling a fairly simple electronic
circuit, and with just about any type fuel sender in the tank, can use
a microcontroller (e.g., Basic Stamp, www.parallaxinc.com). There are
a number of ways to feed voltages to this (digital) IC, and any
nonlinearity in the sender output (the tank itself ain't linear) can
be flattened out with the software. Take readings over time slices
experimentally determined, do the math, and send the output to a
little and cheap serial LCD display. You won't have good
instantaneous readings, but in cruise one just might get a stable and
accurate enough fuel flow. Have to add this to my to do list...the
number of sense inputs planned for my "poor man's EICAS" and checklist
and graphical A of A -- Basic Stamp setup with a 128x64 graphics/text
display -- is up to about 30.
Regards,
Fred F., A063
> Mike Parkin wrote:
>
> Question for the 914 owners. I am interested in fitting a fuel
> flow/computer, but I understand that the fuel returned to the tank
> to minimise the chance of vapour locks can complicate the
> calculation....
> If not, has anyone an alternative solution.
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