F-5-L Boat Seaplane: performance characteristics Page: 2 of 17
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.
TECHNICAL NOTE NO.1 18.
F-5-L BOAT SEAPLANE - PERFORMANCE CH ACTERISTICS.
By Lieut. W. S. D.ehl, U.S.N.
This Note is the second of a series on performance of Service
Naval Airoraft. In general, the outline is quite similar to that
followed in A.T.N. No. 215 (N9H Performance), although certain
changes have been found necessary in determining cruising speeds.
The performance curves given in Figs. 5, 8, and 7 represent more
or less ideal conditions and will hardly be attained except by an
exceptional pilot with an airplane in good shape. Experience
has shown, however, that service deviations from the ideal values
should not be excessive and that the ideal conditions may be
used as a guide in obtaining the best performance.
An explanation of the "stalling speed" is necessary. In most
cases this will be considerably lower than the "landing speed,"
chiefly because of the lack of control at the attitude required
to obtain the slowest possible speed. The values of "probable
landing speed" include the effect of those factors tending to in-
crease the speed on a landing.
Characteristic curves for the RAF-8 airfoil and F-5-L wings
are plotted on Fig. 1. The absolute lift and drag coefficients
CL and CD are defined by the relations:
*Originally prepared as A.T.N. #221, Bureau of Aeronautics, Navy
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Diehl, W. S. F-5-L Boat Seaplane: performance characteristics, report, October 1922; (digital.library.unt.edu/ark:/67531/metadc53786/m1/2/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.