Light aircraft engine muffler

Details Light aircraft engine muffler Light aircraft engine muffler

1983-04-29

1984-12-11

Gellner, Michael L.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181258, 181239, 181273, 181272, 181199, F01N 124

Patent

active

044872909

ABSTRACT:
A relatively small, lightweight muffler is provided, especially adapted to low horsepower aircraft and comprises an elongated, essentially cylindrical structure made up of inner and outer casings having sound-absorbent-material-containing chambers and pressure-wave trap elements to minimize exhaust noises. The rear end of the muffler is in the form of a cone having its apex to the rear and containing a quantity of sound-absorbent material in a rearward part thereof and the conical wall ahead of this material being perforated. One form of the structure has a convex or hemispherical front end for aerodynamic purposes in those cases where the muffler is installed externally of the aircraft. The pressure-wave traps comprise walled structures having louvered slots therein appropriately aimed to direct the pressure waves to the sound-absorbent material.

REFERENCES:
patent: 2705541 (1955-04-01), Finch
patent: 3710891 (1973-01-01), Flugger
patent: 3757892 (1973-09-01), Raudman, Jr.
patent: 4263982 (1981-04-01), Feuling

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