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  2. McKendree cylinder - Wikipedia

    en.wikipedia.org/wiki/McKendree_cylinder

    A McKendree cylinder is a type of hypothetical rotating space habitat originally proposed at NASA's Turning Goals into Reality conference in 2000 by NASA engineer Tom McKendree. [1] Like other space habitat designs, the cylinder would spin to produce artificial gravity by way of centrifugal force.

  3. Contra-rotating propellers - Wikipedia

    en.wikipedia.org/wiki/Contra-rotating_propellers

    Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...

  4. craigslist - Wikipedia

    en.wikipedia.org/wiki/Craigslist

    Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...

  5. O'Neill cylinder - Wikipedia

    en.wikipedia.org/wiki/O'Neill_cylinder

    Artist's depiction of a pair of O'Neill cylinders Interior view, showing alternating land and window segments. An O'Neill cylinder (also called an O'Neill colony, or Island Three) is a space settlement concept proposed by American physicist Gerard K. O'Neill in his 1976 book The High Frontier: Human Colonies in Space. [1]

  6. Contra-rotating - Wikipedia

    en.wikipedia.org/wiki/Contra-rotating

    Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common axis, usually to minimise the effect of torque. Examples include some aircraft propellers , resulting in the maximum power of a single piston or turboprop engine to drive two propellers in ...

  7. Counter-rotating propellers - Wikipedia

    en.wikipedia.org/wiki/Counter-rotating_propellers

    The counter-rotating powerplants of the German World War II Junkers Ju 288 prototype series (as the Bomber B contract winning design), the Gotha Go 244 light transport, Henschel Hs 129 ground attack aircraft, Heinkel He 177A heavy bomber and Messerschmitt Me 323 transport used the same rotational "sense" as the production P-38 did – this has ...

  8. Balance shaft - Wikipedia

    en.wikipedia.org/wiki/Balance_shaft

    The counter balance shafts have eccentric weights and rotate in opposite direction to each other, which generates a net vertical force. The balance shaft was invented and patented by British engineer Frederick W. Lanchester in 1907. [1] [2] It is most commonly used in inline-four and V6 engines used in automobiles and motorcycles.

  9. Coax-P - Wikipedia

    en.wikipedia.org/wiki/Coax-P

    The Coax-P was designed by Hans Neudorfer of NeuraJet and Herbert Hofbauer of Sun Flightcraft. The propeller increases thrust by 15-20% over single propellers and reduces noise levels, especially low frequency noise, while eliminating torque effects.