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naca-wr-l-25

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Notes on the Propeller and Slipstream in Relation to Stability

In reference 1, an analytical treatment is given of
the effect of propeller operation on the pitching moments
of single—engine monoplanes with flaps neutral. The
analysis, which is based on simplifying assumptions, is
accompanied by experimental data. In reference 2, the
analysis and the experiments are extended to the case
with flaps deflected. The present paper is intended to
supplement and, to a small extent, to amend references 1
and 2. A short extension is added on lateral stability.

Some previous work on propeller “fin effect"
(references 5 and h) has been recast in simpler form
with the thrust coefficient replacing the advance-
diameter coefficient as the independent variable. The
new relation, which is more suitable for stability
calculations, is presented herein together with charts
for the side-force derivative cross—plotted from
reference 5. Hereinafter, the term "normal-force
derivative,“ which is applicable to propellers in both
pitch and yaw, is used to replace the term "side—force _
derivative," which is associated with propellers in yaw.

The upwash or downwash from the wing influences the
normal force in pitch. A graph is provided for esti-
mating this change.

The propeller side-force factor was introduced in
reference 5 as a criterion for extrapolating side-force
charts for one propeller to apply to another propeller.
A simpler approximate method that avoids graphical
integration is provided herein for readily estimating
the side—force factor for a.given propeller.

Because the propeller yawing moment due to pitch -
what is the same except for sign, the pitching moment
due to yaw Cm'w-has a small but appreciable effect on
lateral trim, curves for Cm'w have been computed from
the formula of reference 5 and are presented herein.
A derivation in reference n has been extended to
provide a relation for the sidewash of the slipstream of
an isolated propeller in yaw that differs from the one
in common use (reference 6).

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naca-wr-l-25 Notes on the Propeller and Slipstream in Relation to Stability.pdf

naca-wr-l-25

  • Version
  • 9 Downloads
  • 1.20 MB File Size
  • 1 File Count
  • April 21, 2017 Create Date
  • April 21, 2017 Last Updated
Scroll for Details

Notes on the Propeller and Slipstream in Relation to Stability

In reference 1, an analytical treatment is given of
the effect of propeller operation on the pitching moments
of single—engine monoplanes with flaps neutral. The
analysis, which is based on simplifying assumptions, is
accompanied by experimental data. In reference 2, the
analysis and the experiments are extended to the case
with flaps deflected. The present paper is intended to
supplement and, to a small extent, to amend references 1
and 2. A short extension is added on lateral stability.

Some previous work on propeller “fin effect"
(references 5 and h) has been recast in simpler form
with the thrust coefficient replacing the advance-
diameter coefficient as the independent variable. The
new relation, which is more suitable for stability
calculations, is presented herein together with charts
for the side-force derivative cross—plotted from
reference 5. Hereinafter, the term "normal-force
derivative,“ which is applicable to propellers in both
pitch and yaw, is used to replace the term "side—force _
derivative," which is associated with propellers in yaw.

The upwash or downwash from the wing influences the
normal force in pitch. A graph is provided for esti-
mating this change.

The propeller side-force factor was introduced in
reference 5 as a criterion for extrapolating side-force
charts for one propeller to apply to another propeller.
A simpler approximate method that avoids graphical
integration is provided herein for readily estimating
the side—force factor for a.given propeller.

Because the propeller yawing moment due to pitch -
what is the same except for sign, the pitching moment
due to yaw Cm'w-has a small but appreciable effect on
lateral trim, curves for Cm'w have been computed from
the formula of reference 5 and are presented herein.
A derivation in reference n has been extended to
provide a relation for the sidewash of the slipstream of
an isolated propeller in yaw that differs from the one
in common use (reference 6).

File
naca-wr-l-25 Notes on the Propeller and Slipstream in Relation to Stability.pdf
17,003 Documents in our Technical Library
1344556 Total Downloads

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Newest Additions

ADPO10769 Occurrence of Corrosion in Airframes
The purpose of this lecture is to provide an overview ...
MIL-STD-1759 Rivets and Rivet Type Fasteners Preferred for Design
The purpose of this book form standard is to provide ...
MIL-STD-810G Environmental Engineering Considerations and Laboratory Tests
This standard contains materiel acquisition program planning and engineering direction ...
MIL-R-7885D General Specification for Rivets, Blind, Structural, Mechanically Locked Spindle and Friction Locked Spindle
This specification covers mechanically locked spindle and  friction locked spindle ...
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The primary object of this handbook is to provide a ...