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Hi Todd,
This guage uses a pressure differential thru an orifice. See here: http://www.nciweb.net/liquids.htm
My guage is for a 1 1/2 inch pipe and the orifice is around 3/4 inch or
so. That may introduce some restriction, but I'm hoping it isn't
enough to change the readings too much. This could be used in flight
if I ignore the requirement to not change the pipe diameter for a
length of 10 diameters. The guage includes a transmitter so that I
could get readings remotely. I will have to take a look at the guage Rusty found. I just couldn't
find anything retail at a reasonable price. Since I don't quite have
the engine running yet, I'm going to try getting a little temperature
data by blowing a hot air gun on the radiator. I've decided to stick
with 50/50 ethylene glycol for my initial tests. I'm glad the scale
problem was mentioned as I will now use distilled water from the start.
Bob White
On Mon, 28 Feb 2005 22:50:29 -0800
"Todd Bartrim" <haywire@telus.net> wrote:
Message
I bought an RCM-7000 guage on ebay for $50.00 with a measurement range of
4 to 30 GPM.
A Google search for RCM-7000 only found a "coverslipping machine" whatever
that is? So what sort of flow gauge is it that you've got there?
I ended up buying two mechanical gauges from McMaster Carr. One is 1-4.5
gpm, and the other is 5-30 gpm (the highest in that type of gauge). Each
was $59.
Rusty
Same Question? Whacha got? Can either of these be used in flight or is
it just for ground tests? Are these an orifice type? (square root extraction
of DP). If so then they will add a little restriction, but this is where
that pressure recovery and permanent pressure loss comes into play.
The best, most accurate and least restrictive way to measure is using a
magnetic flowtube, which I used in my initial testing. Unfortunately these
are unsuitable for in-flight use due to weight, size, $$$$$$$$$$$, and power
requirements.
The Signet flowmeter that I used was $543 CAD. At least that's what my
uuhh... "supplier" had paid for it. (obsolete stock)
Todd Bartrim
--
http://www.bob-white.com
N93BD - Rotary Powered BD-4 (real soon)
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