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  2. Expansion chamber - Wikipedia

    en.wikipedia.org/wiki/Expansion_chamber

    When the descending piston first exposes the exhaust port on the cylinder wall, the exhaust flows out powerfully due to its pressure (without assistance from the expansion chamber) so the diameter/area over the length of the first portion of the pipe is constant or near constant with a divergence of 0 to 2 degrees which preserves wave energy.

  3. Tuned exhaust - Wikipedia

    en.wikipedia.org/wiki/Tuned_exhaust

    The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head, and merge into two pipes (secondary), which in turn finally link up to form one collector pipe. [2] Compared with a 4-1 exhaust system, a 4-2-1 often produces more power at mid-range engine speeds (RPM), while a 4-1 exhaust produces more power at high RPM.

  4. Jet pack - Wikipedia

    en.wikipedia.org/wiki/Jet_pack

    In the most general terms, a jet pack is a wearable device which allows the user to fly by providing thrust.With the exception of use in a microgravity environment, this thrust must be upwards so as to overcome the force of gravity, and must be enough to overcome the weight of the user, the jet pack itself and its fuel.

  5. List of air show accidents and incidents in the 20th century

    en.wikipedia.org/wiki/List_of_air_show_accidents...

    30 May – Wisconsin State Fairgrounds (Milwaukee, Wisconsin) – Sixteen people were injured when a stunt plane crashed while performing a transfer of a person on an airplane to moving automobile via a ladder stunt. The ladder became hooked on the automobiles exhaust pipe and lifted the vehicle's rear end and threw it out of control.

  6. Timeline of United States inventions (before 1890) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    The pipe wrench, or Stillson wrench, is an adjustable wrench used for turning soft iron pipes and fittings with a rounded surface. The design of the adjustable jaw allows it to rock in the frame, such that any forward pressure on the handle tends to pull the jaws tighter together. Teeth angled in the direction of turn dig into the soft pipe.

  7. List of film and television accidents - Wikipedia

    en.wikipedia.org/wiki/List_of_film_and...

    Bruce Willis lost two-thirds of his hearing in his left ear after firing a gun loaded with extra-loud blanks from underneath a table. [226] Halloween 4: The Return of Michael Myers (1988). While filming a rooftop scene, Ellie Cornell accidentally slipped and her torso was cut by a large nail. She lost a large amount of blood but recovered ...