Computer program is developed for theoretically predicting loading on pylon-mounted stores in subsonic compressible flow. Linear theory predicts flow field produced by aircraft wing, nose, inlet, and pylons. Program was written in FORTRAN IV for CDC 6000 computer

Fernandes, F.

Fox, C. H., Jr.

English

NASA Technical Reports Server

June 1973	 B73-10184 
NASA TECH BRIEF 
•	 Langley Research Center
	 -4r 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Theoretical Prediction of Interference Loading on Aircraft Stores:

Part I - Subsonic Speeds 
The problem: 
Accurate prediction of interference loads on pylon-
mounted aircraft stores. 
The solution: 
A computer program designed to calculate store 
moments of subsonic speeds. 
How it's done: 
A method is developed for theoretically predicting 
the loading on pylon-mounted stores in subsonic com-
pressible flow. Linear theory is used, without two-
dimensional or slender body assumptions, to predict 
the flow field produced by the aircraft wing, nose, inlet, 
and pylons. The interference loading is integrated over 
the store length by considering the local crossflow, its 
axial and radial derivatives, and buoyancy. Store moment 
calculations under an F-4 aircraft at Mach 0.8 are com-
pared to wind tunnel data. A companion Tech Brief 
(see notes) discusses a similar program for supersonic 
speeds.
Notes: 
1. This program was written in FORTRAN IV for the 
CDC-6000 computer. 
2. Reference: Theoretical Prediction of Interface Load-
ing on Aircraft Stores, Part II - Supersonic Speeds, 
NASA Tech Brief B73.10183. 
3. Inquiries concerning this program should be directed 
to:
COSMIC 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: LAR-1 1249 
Source: Charles H. Fox, Jr.

Langley Research Center and
F. Fernandes of
General Dynamics
under contract to
Langley Research Center

(LAR. 1 1249) 
Category 06, 09 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
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Theoretical prediction of interference loading on aircraft stores: Part I - Subsonic speeds

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