(under subclass 247) Apparatus in which the unidirectional flow permitting means comprises a passage means which
prevents flow of combustion products therethrough from said chamber in a reverse direction due to its designed configuration and without a physical valve.
(1) Note. The unidirectional flow permitting means which offers minimum resistance to flow of fuel or oxidizers into the combustion chamber but substantially prevents reverse flow therefrom is normally a fixed orifice type restriction which presents a tortuous path to fluid attempting to leave the combustion chamber. Motors having this type of unidirectional flow permitting means are known in the art as "Valveless pulse jets".
