Hydrodynamic tests for determining the take-off characteristics of seaplanes Page: 4 of 16
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Incidence io = 2o Incidence i 4 Incidence i 6
Speed V Va V4 V, V2 a 4
Lift C 2 C '- C4 C C2 C3 04 C0 2 , 3 C 04
Load C SV C2v 22 V32 04V42 C1V]2 C V j
From tests made in water on the floats, there are determined the
groups of head resistance curves Lxa for different speeds Vn
and different angles of incidence i, referred to those of the
airfoil, each group corresponding to a given total load Wa on
the floats, this load being compensated by the dynamic and static
reactions of the floats. Thus by means of the Lxa experimental
curves corresponding to the two consecutive loads W'a, W"a, which
comprise the load Cn Vn2, we read on'the ordinate Vn the val-
ues of the resistances L'xa, L"xa (which by interpolation give
Lxan corresponding to Cn Vn2, io), for each load Cn Vn2 prev-
iously calculated and relative to a given incidence i = 20 40
60.... We can therefore add to our table a new line giving the
The tests for the determination of the Lxa curves were car-
ried out in England and published in the English reports in 1916.
In these tests the load Wa was taken as being independent of the
velocity. We, however, in 1919, considered the load Wa as a
function of Vn depending on the characteristics of the seaplane
and assuming a form
Wa a - b Vn
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Verduzio, R. Hydrodynamic tests for determining the take-off characteristics of seaplanes, report, May 1923; (digital.library.unt.edu/ark:/67531/metadc277568/m1/4/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.