Perry Mick wrote:
I'm still having high oil temps, I think the problem is my
oil cooler exit cowl opening.
Rather than use a water manometer, I'm going to try to use
an old airspeed indicator I have laying around that reads out
in
mph. Hopefully this will work and be easier to use than
tubes full of water.
Here is a conversion table I came up with:
dynamic (pitot) pressure
q = ps - p = (r/2) * V^2
V, mph V, fps r q, lb/ft2 q, psi q, in. H20
0 0 0.0024 0.00 0.00 0.00
10 15 0.0024 0.26 0.00 0.05
20 29 0.0024 1.02 0.01 0.20
30 44 0.0024 2.30 0.02 0.44
40 59 0.0024 4.09 0.03 0.79
50 73 0.0024 6.39 0.04 1.23
60 88 0.0024 9.20 0.06 1.77
70 103 0.0024 12.53 0.09 2.41
80 117 0.0024 16.36 0.11 3.15
90 132 0.0024 20.71 0.14 3.99
100 147 0.0024 25.56 0.18 4.92
110 161 0.0024 30.93 0.21 5.95
120 176 0.0024 36.81 0.26 7.09
130 191 0.0024 43.20 0.30 8.32
140 205 0.0024 50.11 0.35 9.65
150 220 0.0024 57.52 0.40 11.07
160 235 0.0024 65.45 0.45 12.60
--
Perry J. Mick
Duckt N7XR
http://www.ductedfan.com
The advantage of a water manometer is you can take more than one
measurement
simultaneously. This gives you better results. You can make one
of these out
of plywood and clear plastic tubing in half an hour. Hold the
tubing
in place with safety wire and small holes drilled in the
plywood.
Paul Lamar
Maybe easy to make, but there's no room in my cockpit for
that stuff. I'm going to do the first tests in the morning.
--
Perry Mick
Duckt N7XR
http://www.ductedfan.com
OK. You could put it in the back seat and rig a digital camera
to take pictures of it.
Back in 1969 when we were doing the aero test on the 1970 1/2
Trans Am Firebird it took us a week at El Mirage dry lake
to take all the pressure measurements we needed and we had
a dozen water manometer tubes:-)
Paul Lamar
Motorcycle shop manuals show how
to make these, with a dampner even! You can put
as many tubes as you want to get more data.
Virg
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