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  2. United States Maritime Service - Wikipedia

    en.wikipedia.org/wiki/United_States_Maritime_Service

    The United States Maritime Service ( USMS) was established in 1938 under the provisions of the Merchant Marine Act of 1936 as voluntary training organization [ 3] to train individuals to become officers and crewmembers on merchant ships that form the United States Merchant Marine per 46 U.S.C. § 51701. [ 4]

  3. Second engineer - Wikipedia

    en.wikipedia.org/wiki/Second_Engineer

    In the United States the uniform is in conjunction with Merchant Marine or Merchant Navy standards, depending on company policy. [2] The Merchant Marine uniform distinguishes the First Engineer and the Chief Mate by a propeller on their shoulder boards, or epaulets. It is worn with the propeller closer to the neck and the stripes facing away ...

  4. United States Merchant Marine - Wikipedia

    en.wikipedia.org/wiki/United_States_Merchant_Marine

    The United States Merchant Marine [1] [2] is an organization composed of United States civilian mariners and U.S. civilian and federally owned merchant vessels.Both the civilian mariners and the merchant vessels are managed by a combination of the government and private sectors, and engage in commerce or transportation of goods and services in and out of the navigable waters of the United ...

  5. Contra-rotating propellers - Wikipedia

    en.wikipedia.org/wiki/Contra-rotating_propellers

    Contra-rotating propellers. 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-rotation. Two propellers are arranged one behind the other, and ...

  6. Mess dress uniform - Wikipedia

    en.wikipedia.org/wiki/Mess_dress_uniform

    Officers and chief petty officers of the U.S. Navy, U.S. Coast Guard, United States Public Health Service Commissioned Corps, NOAA Corps, and Merchant Marine use the same mess uniform, referred to as "dinner dress". There are three styles of this uniform—dinner dress, dinner dress jacket, and tropical dinner dress.

  7. Navy Reserve Merchant Marine Insignia - Wikipedia

    en.wikipedia.org/wiki/Navy_Reserve_Merchant...

    The breast insignia of the present Merchant Marine Reserve, U. S. Naval Reserve (Eagle and Scroll) was approved for wear on merchant marine uniforms on 7 April 1938, by Secretary of the Navy, Claude A. Swanson. It replaced the miniature cap device. The authorization for the insignia was the Merchant Marine Act of 1936, which states:

  8. Solutions for cavitation in marine propellers - Wikipedia

    en.wikipedia.org/wiki/Solutions_for_Cavitation...

    This system was developed by Samsung Heavy Industries, based in South Korea. In order to reduce the possibility of cavitation happening in marine propellers, a set of nozzles are placed on the hull of the ship directly in front of the propeller. These nozzles spray out compressed air over the propeller that creates "a macro bubble". [ 1]

  9. Marine propulsion - Wikipedia

    en.wikipedia.org/wiki/Marine_propulsion

    Marine propulsion is the mechanism or system used to generate thrust to move a watercraft through water. While paddles and sails are still used on some smaller boats , most modern ships are propelled by mechanical systems consisting of an electric motor or internal combustion engine driving a propeller , or less frequently, in pump-jets , an ...

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