teamgrumman(at)yahoo.com
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 Posted: Tue Mar 08, 2011 1:23 am Post subject: Project X |
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I flew the Project X plane today. It has two manifold pressure gauges. One of them is connected to manifold pressure. The other is connected to the static line. To the best of my knowledge, I'm the only one who has ever actually measured manifold pressure drop across the carb.
Delta= difference between ambient and manifold pressure
M1= manifold pressure
M2=ambient
Before engine start:
Delta=0.0
WOT (Wide Open Throttle) for take-off/climb (elev=1550 feet)
Delta=0.2
M1=28.7
M2=28.9
WOT (at) 2500 feet and still accelerating
Delta=0.2
M1=27.5
M2=27.7
WOT (at) 2500 feet after 5 minutes
Delta=0.1
M1=27.6
M2=27.7
Let me fill in the blank. My inlet gave back .1 inches of pressure. Not a lot all by itself. Now I need to try a few more planes.
Next step is to compare two AG5Bs flying side by side.
Gary
By-the-way, I'm doing an annual on a Tiger with .5 degrees down thrust angle. It only has ONE shim on each mount (LORD -59 mounts).
I know some of you would like to believe the planes are all the same and that an engine mount measured on a piece of glass to within one-millionth of an inch puts the cowling in the same place each time. It doesn't.
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