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Yes , I measure in the
runner and do not have a plenum down stream of the T/B. But Tracy and I have had
this very discussion, my MAP attempts to measure the stagnation or total
pressure. My comment to Tracy is that if he has a plenum after the T/B , that he
is measuring the stagnation pressure. My tube sticking into the runner has a 45
degree slant cut on it and the opening faces toward the average flow. Tracy says
that the runner sees all kinds of pressures as the rotor inlet opens and closes.
I agree with that, but think you want the average stagnation pressure which is
what his plenum measures. I added a lawnmower fuel filter in the MAP line to
attempt to dampen any pulses out.
Hi Bernie,
Thanks for the comments. What are the inside
diameters of your tubes (assuming primary and secondary are different)?
Also, what RPM are you seeing static, when you said you measured essentially
30"? Do you think you could be getting any ram-air effect in your
MAP port with the open end pointing somewhat into the air
stream?
Thanks,
Rusty (more questions, since you're not
flying)
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