File:330-ps-7618-usn-709514 16581069472 o.jpg

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English: 330-PS-7618 (USN 709514): U.S. Navy PBM-5 aircraft testing the hydro-ski on water landings and takeoffs at Chesapeake Bay, near Baltimore. Tests are being conducted in three positions, with the hydro-ski fixed on a rigid strut close to the hull, partially extended and fully extended. These tests marked the first time the hydro-ski was applied to a seaplane in the patrol bomber category (PBM-5 gross weight is 55,000 lbs). The purpose of the tests is to decrease the impacts encountered during rough water landings and take-offs and is expected to demonstrate that the rigid ski mounted on a single strut extending downwards perpendicularly from the hull acts as a better “shock absorber” for the seaplane landing than the conventional “vee” bottom hull. The ski is located slightly forward of the plane’s center of gravity and has been undergoing tests in three different positions, close to the hull bottom, partially extended and fully extended. The purpose is to determine the best compromise position for the ski, which offers a better shock absorber effect than fully extended, but less aerodynamic and water resistance when only partially extended. Photograph released December 12, 1955. (2/18/2015).
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Source National Museum of the U.S. Navy
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This image is a work of a U.S. military or Department of Defense employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain in the United States.

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