BTW Mike and Larry:Mike Everman wrote: Maybe we should have a little contest between the hard core builders here, for "best" (whatever THAT means) implementation of a straight piper at 22" long.
I'd like to see the allowable length increased to 32 inches. The commonly-used 1-inch conduit (for intake, etc.) implies a combustion chamber diameter of something like 2 inches. Using the available data for combustion duration, that means the 1/frequency to support the necessary burn time implies a length of 32 inches. The "Laird Chinese" supports this contention, BTW.
WE CAN use the shorter length--but the combustion event will be severely compromised, and the SFC will suffer accordingly.
Acoustic Propulsion Concepts
".......some day soon we'll be flying airplanes powered by pulsejets."