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National Advisory Committee for Aeronautics, Report - Experimental Investigation of the Robinson Type Cup Anemometer

An investigation on the Robimomtype cup anemom—
eter has been completed by‘ the National Advisory Com-
mittee for Aeronautics. This investigation covered force
measurements on individual cups, as well as static and
dynamic torque measurements and calibrations on com-
plete cup wheels. In the tests on individual cups 5 cup
forms were used and in the measurements on complete
cup wheels 4 cup wheels with 3 arm lengths for each
cup wheel were tested. All the results are presented in
graphical form.

The National Advisory Committee for Aeronautics,
in cooperation with the United States Weather Bureau,
has conducted an investigation on the Robinson-type
cup anemometer.

This investigation comprised: (1) a study of the
forces on individual cups through a wide range of
Reynolds Number; (2) static-torque measurements on
several cup wheels, using three different arm lengths
for each cup wheel tested; (3) dynamic-torque tests
of the same cup wheels with the same arm lengths
as used in the static-torque measurements; (4) cali-
bration tests of the same cup wheels on a regular
service spindle as used by the Weather Bureau; (5)
torque measurements on a single cup through a com-
plete revolution under operating conditions, i. e.,
mounted in a cup wheel in such a manner that the
torque produced by the individual cup could be meas-
ured , a comparison of the plotted results thus obtained
with results calculated from static-torque measure-
ments on individual cups; and (6) drag tests on com—
plete cup wheels.

Patterson (reference 1) made an extensive investi-
gation covering part of the same field and presented
a very complete history of the problem. The agree-
ment between the results from the two investigations
is, in general, close.