Characteristics of an NACA 66, S-209 section hydrofoil at several depths Page: 2 of 11
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NATIONAL ADVTISQRY CQOMMTTs E 4OR AMROT4UXOS
-- ~. --- -
QONFIDENTZAL UTLLETIN
-.:
." 0HARAQ.TERISTICS OF AN NACA 66,.S #09 SECTION
'.TnOFoXL; AT SEVERAL .DE.P S
A ., .By Norman 8, Land .
INTRODUCTION
In order to fulfill a need for information for use
in preliminary design of systems of hydrofoils, the NAPA
has conducted sev.er al .Lnvestigat ons.of.th force charac
teristis, pf .s.gle. 'hdrofotils:; YWhe :first invres tigation
of this t'ype(reference 1) was p&e nin .ardet to determine
the characteristics of hydrofoils of several sections. A
second investigation of the effect of dihedral and depth
of submersion was reported in reference 2. None of the
sections used in the afo.rememnti.oned tests were especially
designed for use as hydrofoils. The present report sup-
plements the reference reports and gives-the results of
tests of a. hydrofol.,with a:seti oi .thatwas specifically
designed to meet .some of . the ereqirdments of high-speed
und rwater.operation. ... Thisase on; shown in figure 1,
has a sliarp leading edge and a substantially flat chord-
wise pressure distribution at a lift coefficient of 0.2.
It has been desl.hgatedoth..ACA'G66,S+2 9 'sectieori
ThSTLTS AND DISCUSSION.
Figure 2 shows the 5-inch chord by 30-inch span
hydrofoil with its supporting struts. Ordinates for the
NACA 66,8-209 section hydrofoil are given in table I.
Figures 2 to 6 show the results of the tests made with
the hydrofoil at various depths and angles of attack.
These results are presented as lift and drag.coefficients
of the standard NACA form plotted as a function of speed,
with angle of attack as a parameter. Small arrows on
these curves indicate the lowest speed at which cavita-
tion was observed on the upper surface of the hydrofoil
at each angle of attack, A summary of the characteristics
f the hydrofoil at a depth of 25 inches (5 chords) is
given in figure 7,
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Land, Norman S. Characteristics of an NACA 66, S-209 section hydrofoil at several depths, report, May 1943; (https://digital.library.unt.edu/ark:/67531/metadc61781/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.