Effect of shallow water on the hydrodynamic characteristics of a flat-bottom planing surface Page: 3 of 37
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2 NACA TN 3642
water of various depths. The experiments were made on water that was
made shallow by means of adjustable false bottoms in the test region.
Sufficient ranges of trim and wetted lengths were included for evalua-
tion of the importance of the proximity of the bottom for typical hydro-
ski take-off and landing conditions.
CD drag coefficient based on wetted area, Dag
CL lift coefficient based on wetted area, Lift
CMte trimming-moment coefficient about trailing edge of model,
CV speed coefficient, V
b beam, 0.208 ft
g acceleration due to gravity, 32.15 ft/sec2
Zm mean wetted length, ft
q dynamic pressure, pV2 lb/sq ft
S wetted area, Zmb, sq ft
V speed, ft/sec
z clearance (vertical distance between trailing edge of model
and false bottom of tank), ft
p mass density, 1.977 slugs/cu ft for salt-water data,
1.938 slugs/cu ft for fresh-water data
T trim angle, deg
MODEL AND APPARATUS
The investigation was made at the Langley tank no. 2 monorail. A
description of the monorail and its carriages and instrumentation is
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Christopher, Kenneth W. Effect of shallow water on the hydrodynamic characteristics of a flat-bottom planing surface, report, April 1956; (digital.library.unt.edu/ark:/67531/metadc57919/m1/3/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.