An analysis is presented to determine the feasibility of using jet flap foils as anti-pitching fins for large ships. The effectiveness of ordinary anti-pitching fins is limited by the occurrence of cavitation. It is shown that the jet flap postpones cavitation until the lift reaches two to three times the no jet value. Boundary layer calculations indicate that cavitation and not separation is the limiting condition for operation of the foil. For an oscillating jet angle, it is shown that at the frequencies associated with wave orbital velocities the forces are quasi-steady and so is the condition for the inception of cavitation. Finally some consideration of the power requirements necessary to operate the jet flap are presented, and it is shown that the power expended to obtain a 25% decrease in pitch is a very small fraction of the total propulsive power available on an aircraft carrier of the Forrestal class. (Author)


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    Title :

    Use of Jet-Flapped Hydrofoils as Ship Antipitching Fins


    Contributors:
    P. Kaplan (author) / T. R. Goodman (author)

    Publication date :

    1964


    Size :

    2 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Use of jet-flapped hydrofoils as ship antipitching fins

    Kaplan, P. / Goodman, T.R. | Engineering Index Backfile | 1967


    Use of Jet-Flapped Hydrofoils as Ship Antipitching Fins

    PAUL KAPLAN AND THEODORE R. GOODMAN | AIAA | 1967



    Flapped efficiency

    Engineering Index Backfile | 1936


    Flapped efficiency

    Engineering Index Backfile | 1936