This is about 21 or 22 inches long. 6000 RPM roughly.
Simple! Move it in and out relative to the block.


Paul Lamar

Paul, thanks for the drawing, now I am able to make myself clear:

The rear rotor intake tube has to make only one 90-deg turn
the intake for the front rotor has to make one 90-deg turn, one 180-deg
turn, one 45-deg turn

The air in the front intake should be slower than the one in the rear intake
by the time it gets to the port.
My question was, if there is any way to calculate ( from empirical tables,
tests, etc.) how  much longer/shorter either runner would have to be to
compensate for the different number of turns the air/mixture has to take.
On average it probably doesn't matter, but if you want to get the last ounce
out of it, rpm will never hit the sweetspot for both runners at the same
time.

As I mentioned there is plenty of data for hydraulic applications (mainly
from the hydraulic parts suppliers - right in the catalogs, but I couldn't
find any for gas yet.....)
Thomas J.

PS: You are right with the helicopter! :))

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