A device which does for the aircraft what change speed gears do for the automobile is the invention of Spencer Heath. It comprises a system of special blades and a mechanism for varying the pitch of the blades from zero to 360 degrees, while in flight or otherwise.


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    Title :

    The "Universal" Adjustable and Reversible Propeller Built by Paragon Engineers, Inc., Baltimore, Md


    Contributors:

    Publication date :

    1922-11-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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