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naca-tn-720

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National Advisory Committee for Aeronautics, Technical Notes - Flight Tests of NACA Nose Slot Cowlings on the BFC-1 Airplane

naca-tn-720-flight-tests-of-naca-nose-slot-cowlings-on-the-bfc-1-airplane-1

The results of flight tests of four nose-slot cowling
designs with several variations in each design are pre-
sented. The tests were made in the process of developing
the nose-slot cowling. The results demonstrate that a nose-
slot cowling may be successfully applied to an airplane and
that it utilizes the increased slipstream velocity of low~
speed operation to produce increased cooling pressure across
the engine. A sample design calculation using results from
wind—tunnel, flight, and ground tests is given in an appen-
dix to illustrate the design procedure.

The first flight tests of an H.A.C.A. nose-slot cowl-
ing are described in reference 1.

The subject report presents results of four designs
of nose-slot cowlings for the BEG-l airplane in the order
they were tested. The results of the tests of each cowl—
ing are presented in the following manner: (1) A discus-
sion of the flow conditions that were desired to be changed;
(2) a discussion of the alterations in the cowling that
were made in an attempt to produce the desired change;
(5) a discussion of the success of the alterations in pro-
ducing the desired result.

Inasmuch as a cowling design for flight must first
give satisfactory operation of the airplane and the engine,
this factor was the primary consideration for the first
two nose-slot cowlings. Most of the actual studies of flow
around a nose-slot cowling were made with nosc~slot cowl-
ings 3 and 4. -

Roferonce 2 gives the results of wind-tunnel tests of
nose-slot cowlings that were conducted after these flight
tests were completed. This reference gives more complete
information on the effect of variables gush as the radius
of curvature of the nose shape, the slot location, the
slot size, and the effect of engine conductivity. Some of
the special problems of applying cowl_ing design to flight
work will be discussed in the present paper. Many details
that do not enter the problem when making wind—tunnel tests
become the determining factors of design for flight tests.
Anything that impairs the operation of the engine or air~
plane, or that interferes with the pilot's ease of flying
the airplane, must be given serious consideration by the
designer of cowlings for flight. The designer must always

strive to obtain a good aerodynamic design consistent wi th
the successful operation of the airplane.

An example of a design computation along with charts
to aid in its solution is given in an appendix of this re-
port.

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naca-tn-720

  • Version
  • 130 Downloads
  • 1.29 MB File Size
  • 1 File Count
  • November 29, 2016 Create Date
  • November 29, 2016 Last Updated
Scroll for Details

National Advisory Committee for Aeronautics, Technical Notes - Flight Tests of NACA Nose Slot Cowlings on the BFC-1 Airplane

naca-tn-720-flight-tests-of-naca-nose-slot-cowlings-on-the-bfc-1-airplane-1

The results of flight tests of four nose-slot cowling
designs with several variations in each design are pre-
sented. The tests were made in the process of developing
the nose-slot cowling. The results demonstrate that a nose-
slot cowling may be successfully applied to an airplane and
that it utilizes the increased slipstream velocity of low~
speed operation to produce increased cooling pressure across
the engine. A sample design calculation using results from
wind—tunnel, flight, and ground tests is given in an appen-
dix to illustrate the design procedure.

The first flight tests of an H.A.C.A. nose-slot cowl-
ing are described in reference 1.

The subject report presents results of four designs
of nose-slot cowlings for the BEG-l airplane in the order
they were tested. The results of the tests of each cowl—
ing are presented in the following manner: (1) A discus-
sion of the flow conditions that were desired to be changed;
(2) a discussion of the alterations in the cowling that
were made in an attempt to produce the desired change;
(5) a discussion of the success of the alterations in pro-
ducing the desired result.

Inasmuch as a cowling design for flight must first
give satisfactory operation of the airplane and the engine,
this factor was the primary consideration for the first
two nose-slot cowlings. Most of the actual studies of flow
around a nose-slot cowling were made with nosc~slot cowl-
ings 3 and 4. -

Roferonce 2 gives the results of wind-tunnel tests of
nose-slot cowlings that were conducted after these flight
tests were completed. This reference gives more complete
information on the effect of variables gush as the radius
of curvature of the nose shape, the slot location, the
slot size, and the effect of engine conductivity. Some of
the special problems of applying cowl_ing design to flight
work will be discussed in the present paper. Many details
that do not enter the problem when making wind—tunnel tests
become the determining factors of design for flight tests.
Anything that impairs the operation of the engine or air~
plane, or that interferes with the pilot's ease of flying
the airplane, must be given serious consideration by the
designer of cowlings for flight. The designer must always

strive to obtain a good aerodynamic design consistent wi th
the successful operation of the airplane.

An example of a design computation along with charts
to aid in its solution is given in an appendix of this re-
port.

FileAction
naca-tn-720 Flight Tests of NACA Nose Slot Cowlings on the BFC-1 Airplane.pdfDownload 
17,005 Documents in our Technical Library
2449555 Total Downloads

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Newest Additions

NASA-RP-1060 Subsonic Aircraft: Evolution and the Matching of Size to Performance
NASA-RP-1060 Subsonic Aircraft: Evolution and the Matching of Size to Performance
AA-CP-20212-001
AA-CP-20212-001
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 ...