F-5-L Boat Seaplane: performance characteristics Page: 3 of 17
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Lift = 0L (I/2 PVr) s
Drag = CD (1/2 PV ) s
%here S is the wing area, V the velocity and P the mass den-#
sity of the air. These equations hold true and the coefficients
CL and CD have the same value in any consistent system of units.
It should be noted that P is the mass-density of the air, that
is, the .eight per unit volume divided by the acceleration of
gravity, For force in Ibe., area in sq.ft. , and velocity in ft/
ses., P = .00237 for standard. air; or for force in lbs., area
in Sq. ft., and velocity in mi/h.T, P = .0051 for standard air.
The variation of P with altitude may be obtained from the ourve-
given in Aircraft Design Data, Vol. I.
Resistance and Velocity.
A summation of the parasite resistance for all parts except
the hull of the F-5-L seaplane gives Rp = 812 lbs, at 70 mi/hr.;
334 lbs. of this is in the slip stream and the remainder, 478 lbs.
is clear of the slip stream. These resistances vary as the square
of the velocity so that at any velocity V, (mi/hr) the total
parasite resistance (except the hull) is
R= F.R, f R
(334 F + 478) ()a
where F is the factor which corrects for the increased velocity
in the slp stream.
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Diehl, W. S. F-5-L Boat Seaplane: performance characteristics, report, October 1922; (digital.library.unt.edu/ark:/67531/metadc53786/m1/3/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.