초록 ▼

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

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.

대표청구항 ▼

A muffler for use with the internal-combustion engine of light aircraft, comprising an elongated, essentially hollow structure having a cylindrical body and front and rear end portions, said body being in the form of an imperforate cylindrical wall, said front end portion including a wall spanning a

A muffler for use with the internal-combustion engine of light aircraft, comprising an elongated, essentially hollow structure having a cylindrical body and front and rear end portions, said body being in the form of an imperforate cylindrical wall, said front end portion including a wall spanning and affixed to the front end of the body, one of said walls including a forward exhaust inlet leading to the interior of the structure, and said rear end portion being in the form of a cone coaxial with and having its base affixed to the rear end of the body and its apex disposed rearwardmost, said cone including a foraminous interior radial partition fixedly positioned intermediate the base and apex of the cone to form a conical chamber at the cone apex, the wall of the cone forwardly of the partition having a plurality of perforations therein, sound-absorbent material contained in the apex chamber, a tubular pressure-wave trap element within the cylindrical wall and extending from the exhaust inlet to the cone, said element having a peripheral wall spacedly surrounded by the cylindrical wall to provide an annular chamber between the element and the cylindrical wall, the element wall including a plurality of slots therein communicating the interior of the element with the annular chamber, and sound-absorbent material contained in the annular chamber.