Accession Number:

ADA018563

Title:

Hull Modifications of Air-Sea Craft to Reduce Motions at Zero Speed in a Seaway.

Descriptive Note:

Final rept.,

Corporate Author:

STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB

Personal Author(s):

Report Date:

1974-10-01

Pagination or Media Count:

46.0

Abstract:

Methods for reducing the motions response of floating airsea craft in waves will enhance their effectiveness for certain kinds of missions, such as rescue or surveillance operations. Great improvements can be accomplished with relatively small craft by lifting them above the oceans surface on vertical flotation elements, but such systems entail complex design, installation and operational features and some weight and space penalty. This research considered alternative, simpler, modifications to airsea craft to improve the sea-keeping behavior. The relatively minor changes to hull shape andor weight distribution which can reasonably be made and still satisfy aerodynamic and take-off and landing performance requirements do not produce significant modifications. Various appendages connected to a typical airsea craft hull, such as flat plates extended below the hulls underbody, were found to reduce significant pitch motions in typical irregular waves to about 40 of the motions for the basic craft vertical floats supports might reduce motions to as little as 10 in similar waves. Heave motions are nearly the same for the three alternative systems in these waves. An alternative inflatable, water-filled appendage is proposed which is capable of substantially attenuating wave-induced forces and motions. Author

Subject Categories:

  • Aircraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE