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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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