Acoustics – Auditorium
Patent
1975-04-24
1977-06-28
Tomsky, Stephen J.
Acoustics
Auditorium
181 40, 181 57, F01N 100
Patent
active
040319792
ABSTRACT:
In a muffler for a two-cycle combustion engine of the type commonly used to power miniature aircraft, cars, boats and models, the exhaust gas is directed into an expansion chamber for expansion and cooling, thence through a series of spaced baffles in a baffle chamber, and thence through a nozzle to the atmosphere. The baffle plates may comprise one or more different types having different sonic wave reflective characteristics and different impedances to gas flow. The baffle plates are spaced apart by one or more of a number of spacers providing different axial spacing between the baffle plates. THe baffle plates and their spacings are chosen by the user so as to obtain the required degree of muffling with the least amount of back pressure on the engine, as back pressure reduces engine power. The user is supplied with a kit having the various different type baffles and spacers. The user selects from the kit the desired spacers and baffles in accordance with his own experiments or in accordance with experimental data supplied by the manufacture of the kit. The nozzle includes a threaded end for mating with the threaded interior of the baffle chamber so that by removing the nozzle the baffles and the spacers may be stacked in the baffle chamber in the desired configuration and the nozzle replaced for securely holding the baffles in the desired geometry.
REFERENCES:
patent: 2795103 (1957-06-01), Jenison
patent: 3434280 (1969-03-01), Burkhart
patent: 3545566 (1970-12-01), Abrahamsson
patent: 3842932 (1974-10-01), Gibel
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