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A Brief Hydrodynamic Investigation of a 1/24-Scale Model of the DR-77 SeaplaneA limited investigation of a 1/24-scale dynamically similar model of the Navy Bureau of Aeronautics DR-77 design was conducted in Langley tank no. 2 to determine the calm-water take-off and the rough-water landing characteristics of the design with particular regard to the take-off resistance and the landing accelerations. During the take-off tests, resistance, trim, and rise were measured and photographs were taken to study spray. During the landing tests, motion-picture records and normal-acceleration records were obtained. A ratio of gross load to maximum resistance of 3.2 was obtained with a 30 deg. dead-rise hydro-ski installation. The maximum normal accelerations obtained with a 30 deg. dead-rise hydro-ski installation were of the order of 8g to log in waves 8 feet high (full scale). A yawing instability that occurred just prior to hydro-ski emergence was improved by adding an afterbody extension, but adding the extension reduced the ratio of gross load to maximum resistance to 2.9.
Document ID
20090026360
Acquisition Source
Legacy CDMS
Document Type
Other - NACA Research Memorandum
Authors
Fisher, Lloyd J. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Hoffman, Edward L. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Date Acquired
August 24, 2013
Publication Date
May 20, 1953
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NACA-RM-SL53F04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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