THE AERODYNAMIC CHARACTERISTICS OF NON-AERODYNAMIC SHAPES

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Abstract:

A wind tunnel investigation of three basic shapes cubes, rectangles, and cylinders was conducted to determine the aerodynamic characteristics of similar shaped cargos carried externally by helicopters or VSTOL aircraft. The ratio of side area to frontal area was used as a parameter to plot the lift, drag, and pitching moment versus angle of attack for the three shapes. The lift, drag, and pitching moment coefficients were plotted for angles of attack from 5 degrees to -90 degrees. The change in slopes of the pitching moment of both rectangles and cylinders was smooth and gradual indicating no rapid changes in static stability. By using a very flat nose fairing, it was possible to reduce the drag by 30 at 0 degrees angle of attack without increasing the forces at the larger angles of attack.

Author(s):
Lehmann, Maurice J.
Author Organization(s):
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
Descriptive Note:
Master's thesis
Pagination:
0066

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
GAM/AE/68-6
Monitor Series:
AFIT
 Subject Terms
Joint Capability Areas:
JCA_3_Force Application; JCA_3.2_Engagement; JCA_3.2.1_Kinetic Means; JCA_7.2.1_Mitigate Lethal Effects; JCA_7.2_Mitigate; JCA_7_Protection; JCA_8_Building Partnerships; JCA_4_Logistics; JCA_8.2_Shape; JCA_4.6_Engineering; JCA_8.1_Communicate; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_5_Command and Control
Communities of Interest:
Space
Descriptor(s):
*EXTERNAL STORES, *SHORT TAKEOFF AIRCRAFT, AERODYNAMIC CHARACTERISTICS, ANGLE OF ATTACK, BLUNT BODIES, CYLINDRICAL BODIES, DRAG, FAIRINGS, FLOW VISUALIZATION, HELICOPTERS, LIFT, MODEL TESTS, PITCH(MOTION), RECTANGULAR BODIES, REYNOLDS NUMBER, STABILITY, VERTICAL TAKEOFF AIRCRAFT, WIND TUNNEL MODELS
Field(s)/Group(s):
Aerodynamics, Helicopters, VSTOL
Keyword(s):
DYNAMIC PRESSURE, GRAPHS(CHARTS), LIFT DRAG RATIO
Report Date:
1968 Jun 01