For those of you who are not versed in plumbing 101, a stand pipe
is  an additional vertical pipe with one end caped and the other
is  attached to the water line in the proximity of a valve.It prevents
what is called a hammer noise in the Water line when the valve is
closed quickly diverting the water flow and compressing the air
in  the standpipe.

Joel

I'm taking three aspirin, so  call me in the morning.

Joel,
The standpipe idea is  used on single cylinder dirt bikes. They
came up with the idea of  calling it a"Boost Bottle."
Laughable name but the idea is the same.  Not sure if it
will help a rotary as the pulses are much closer  together,
but the idea has been used before.
Bill  Jepson

Its is really a Helmholtz resonator.
Look it up  on google.

http://www.dinamoto.it/DINAMOTO/on-line%20papers/risuonatore/risuonatore.html

Late model Porsche engines use the principle.

Paul  Lamar

Bill,
Is it true that the optimum inlet speed  fro max VE  is between 200 mph and
300 mph  - and in exceeding 600 mph the inlet  tube is so full of  pulses it
acts to restrict flow?
George (down  under)


George,
I think the speed in the inlet maximum is dependant on engine RPM, (and
therefore the pulses in the inlet), and cylinder or housing volume. Even the  sp
eed of sound isn't a true limiting factor, although it causes complication in
planning. Ford actually designed a carburetor with a supersonic nozzle. This
was  an effort for better atomization
Bill Jepson