The development of satisfactory flying qualities on the Douglas dive bomber, model SBD-1 through flight testing successive modifications in control-surface area, hinge-line location, and aerodynamic-balance nose shape Page: 2 of 73
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THE DEVELOPENT OF SATISFACTORY FLYING QUALITIES ON THE
DOUGLAS DIVE BOBER, MODEL SBD-1 THROUGH FLIGHT TESTING
SUCCESSIVE MODIFICATIONS IN CONTROL-SURFACE AREA,
HINGE-LINE LOCATION, AND AERODYNAMIC-BALANCE NOSE SHAPE
By L. E. Root
Upon the basis of interest expressed in the methods used to
obtain desirable control-force characteristics on the Douglas
Model SBD-1 airplane by minor relocation of control-surface hinge
line in combination with modifications in aerodynamic balance
nose shape, flight-test data contributing to the development of
the present SBD-1 flying qualities have been presented. In view
of the consideration that such information would be of possible
value as a guide for obtaining satisfactory flying qualities on
other experimental airplanes, detailed flight-test results inii-
cating the effects of various wing- and control-surface modifica-
tions on the stalling characteristics and stability and control
of the prototype models are included.
A brief history of the various design phases is given for
better understanding of the modifications finally incorporated
in the model SN)-1. Flight-test results obtained during these
phases are presented and discussed in three sections: stalling
characteristics, lateral-directional stability and control, and
longitudinal stability and control. All available information
is given to describe the detailed nature of each modification in
control-surface area, cross section, aerodynamic balance nose
shape, hinge-line adjustment, or charge in control system. Par-
ticularly, the method used to obtain hinge-line adjustment with'
out change in the moveable-to-fixed control-surface gap is shown.
A comparison is made between the original and the final airplane
configurations, particularly emphasizing the nature of control-
surface modifications made.
Certain definitions and symbols, in addition to those given
in other NACA publications, were found necessary in order that
the detailed control-surface geometry be specifically defined.
These are offered for adoption as standard in other technical
data to be published on control-surface design. Based upon the
extensive flight testing accomplished on the SBD-1 and prototype
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Root, L. E. The development of satisfactory flying qualities on the Douglas dive bomber, model SBD-1 through flight testing successive modifications in control-surface area, hinge-line location, and aerodynamic-balance nose shape, report, May 1942; (digital.library.unt.edu/ark:/67531/metadc61066/m1/2/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.