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The Effect of the Angle of Afterbody Keel on the Water Performance of a Flying-Boat Hull ModelNACA model 11-C was tested according to the general method with the angle of afterbody keel set at five different angles from 2-1/2 degrees to 9 degrees, but without changing other features of the hull. The results of the tests are expressed in curves of test data and of non-dimensional coefficients. At the depth of step used in the tests, 3.3 percent beam, the smaller angles of afterbody keel give greater load-resistance ratios at the hump speed and smaller at high speed than the larger angles of afterbody keel. Comparisons are made of the load-resistance ratios at several other points in the speed range. The effect of variation of the angle of afterbody keel upon the take-off performance of a hypothetical flying boat of 15,000 pounds gross weight having a hull of model 11-C lines is calculated, and the calculations show that the craft with the largest of the angles of afterbody keel tested, 9 degrees, takes off in the least time and distance.
Document ID
19930081311
Acquisition Source
Legacy CDMS
Document Type
Other - NACA Technical Note
Authors
Allison, John M. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1935
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NACA-TN-541
Accession Number
93R10601
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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