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National Advisory Committee for Aeronautics, Technical Notes - The Pressure Distribution Over a Modified Elliptical Wing Tip on a Biplane in Flight

This note presents the results of flight pressure— 31
distribution tests on the right upper wing panel of a
Douglas M—S airplane equipped with a modified elliptical
tip having a slight amount of washout.

The results are given in tables and'curves in such
form that the load distribution for any normal force coef~
ficient within the usual range encountered in flight may
be determined.

To supply reliable and systematic information on the
effect of changes in wing-tip plan form on the load dis—
tribution,‘a flight investigation of the pressure distri—
bution over wing tips has been undertaken by the National
Advisory Committee for Aeronautics at Langley Field, Va.
This investigation has been outlined to include pressure
measurements on the right upper panel of a Douglas H—S
airplane with several variations in tip form. These vari—
ations are systematic in the main, but also include a few
odd shapes. either because such forms are commonly used or
because information of value could be obtained with little
additional work.

The results of tests on four tips have already been
reported: The "Douglas" tip in reference 1; the square
tip with faired end and the square tip without_faired end,
in reference 2; and the semicircular tip in reference 3.
This paper, the fourth_in the series,_cqnprises the data
obtained on a modified elliptical tip having a slight'
amount of washout.

During these tests a rounded tip of_ths "Douglas"
form (see reference'l) was used on the right lower panel.
However, as was shown in previous tests (reference 2), the
results obtained on the upper wing may be considered as
unaffected by the shape of the-lower tip.