In reply to Carl Reynauds comments:
<snip> it is indeed possible to change the
> size of the entry jet into a pelton wheel type flow meter. The RS
> meter is actually supplied with an insert which changes the effective
> flow range of the meter. As the size of the jet is increased, the
> flow velocity is reduced, This in turn inceases the flow rate at
> which the meter will start to read.
>
> It may be possible to increase the bore to a size where the meter does
> not read at idle, but reads accurately at modest (low cruise, or
> powered descent) rpm upwards. This would still allow measurement of
> fuel used over the majority of the flight regime.
This introduces another variable into the reading leading to a
point where it would not be worth having at all. Have a look at
Touchdown's fuel flow meter on http://www/avnet.co.uk/touchdown
Regards
-------------------------------------------------------
Richard Meredith-Hardy TEL + 44 (0)1462 834776
rmh@flymicro.win-uk.net FAX + 44 (0)1462 732668
CIS: 100071,2422
Check out the British Microlight Aircraft Association at
http://www.avnet.co.uk/bmaa/bmaa.htm
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