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  2. Milkor 37/38mm and 40mm Stopper - Wikipedia

    en.wikipedia.org/wiki/Milkor_37/38mm_and_40mm...

    The Milkor Stopper is a riot gun used for riot control, designed to fire a 37/38mm or 40mm cartridge, which can be a 9mm Buckshot, Rubber ball buckshot, teargas canister, rubber shot cartridge or explosive. The weapon is simple to operate and all metal surfaces are treated with a coating for corrosion protection, plus long-life dry film ...

  3. Hush kit - Wikipedia

    en.wikipedia.org/wiki/Hush_kit

    Hush kit for the Pratt and Whitney JT8D-1 through -17 engines Two JT4As installed on a KLM DC-8. A hush kit is an aerodynamic device used to help reduce the noise produced by older aircraft jet engines. These devices are typically installed on older turbojet and low-bypass turbofan engines, as they are much louder than later high-bypass ...

  4. Expansion chamber - Wikipedia

    en.wikipedia.org/wiki/Expansion_chamber

    When the transfer is complete, the piston is on the compression stroke but the exhaust port is still open, an unavoidable problem with the two stroke piston port design. To help prevent the piston pushing fresh mixture out the open exhaust port the strong acoustic wave (produced by the combustion) from the expansion chamber is timed to arrive ...

  5. Diverterless supersonic inlet - Wikipedia

    en.wikipedia.org/wiki/Diverterless_supersonic_inlet

    A diverterless supersonic inlet (DSI) is a type of jet engine air intake used by some modern combat aircraft to control air flow into their engines. It consists of a "bump" and a forward-swept inlet cowl, which work together to divert boundary layer airflow away from the aircraft's engine.

  6. Sound attenuator - Wikipedia

    en.wikipedia.org/wiki/Sound_attenuator

    A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces. [1] [2]

  7. Scavenging (engine) - Wikipedia

    en.wikipedia.org/wiki/Scavenging_(engine)

    For two-stroke engines, crossflow scavenging was used in early crankcase-compression engines, such as used by small motorcycles. The transfer port (where the fuel/air mixture enters the combustion chamber) and the exhaust port were located on opposite sides of the combustion chamber. This arrangement had the advantage of simplicity, but it also ...