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  2. M30 Luftwaffe Drilling - Wikipedia

    en.wikipedia.org/wiki/M30_Luftwaffe_Drilling

    The weapon has two hammerless shotgun barrels with a single rifle barrel underneath, firing two 12 gauge or 16 gauge shotgun shells (16 gauge seems to have only been used on the commercial version) alongside a single 9.3×74mmR rifle round. The M30 has two triggers and a sliding selector directly behind the lever for opening the breech.

  3. Combination gun - Wikipedia

    en.wikipedia.org/wiki/Combination_gun

    The triple-barrel shotgun is the rarest configuration, and arguably is an odd variant of a double-barreled shotgun rather than a drilling since it lacks the rifle/shotgun combination that all the other drillings have. The triple-barrel shotgun is generally laid out like a side-by-side shotgun, with the third barrel centered and below the other two.

  4. Valve timing - Wikipedia

    en.wikipedia.org/wiki/Valve_timing

    Valve timing diagram for a 4-stroke engine. With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in ...

  5. List of abbreviations in oil and gas exploration and production

    en.wikipedia.org/wiki/List_of_abbreviations_in...

    AADE – American Association of Drilling Engineers [1] AAPG – American Association of Petroleum Geologists [2] AAPL – American Association of Professional Landmen; AAODC – American Association of Oilwell Drilling Contractors (obsolete; superseded by IADC) AAV – Annulus access valve; ABAN – Abandonment, (also as AB and ABD and ABND)

  6. List of multiple-barrel firearms - Wikipedia

    en.wikipedia.org/wiki/List_of_multiple-barrel...

    Mk 1 Underwater Defense Gun: Mark 59 Mod 0 Projectile United States: 1970 Heckler & Koch P11 [2] Heckler & Koch: 7.62×36mm West Germany: 1977 SPP-1 underwater pistol: Tulsky Oruzheiny Zavod: 4.5×40mmR Soviet Union: 1975 Henrion, Dassy & Heuschen double-barrel revolvers: Henrion, Dassy & Heuschen.25 ACP.32 ACP 6.5 Velodog Belgium France: 1911 ...

  7. Desmodromic valve - Wikipedia

    en.wikipedia.org/wiki/Desmodromic_valve

    The valves in a typical four-stroke engine allow the air/fuel mixture into the cylinder at the beginning of the cycle and exhaust spent gases at the end of the cycle. In a conventional four-stroke engine, valves are opened by a cam and closed by return spring.

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    mail.aol.com

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  9. Four-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Four-stroke_power_valve_system

    A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). [1] It first appeared on the Yamaha FZR EXUP and was later used on many ...