Computer program was written to evaluate and define optimum design parameters of low pressure auxiliary propulsion system. APS will provide attitude and translational control of space shuttle vehicles. Program evaluates subsystem design parameters such as engine chamber pressure, mixture ratio, expansion ratio, and subsystem component weight and size

Burns, A. E.

Kaemming, T. A.

English

NASA Technical Reports Server

October 1972	 B72-10605 
r NASA TECH BRIEF 
Manned Spacecraft Center	
_4V 
NASA Tech Briefs announce now 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. 
Propulsion Sizing Program 
The problem: 
To identify and evaluate auxiliary propulsion system 
(APS) concepts, and to perform, for the more attractive 
of these, an in-depth design and performance analysis. 
The solution: 
A computer program was written to evaluate and 
define optimum design parameters of a low pressure 
APS. The APS will provide attitude and translational 
control of a NASA Space Shuttle Vehicle. 
How it's done: 
The program evaluates, for various space shuttle 
performance requirements, the optimum subsystem de-
sign parameters such as engine chamber pressure, mixture 
ratio, expansion ratio, and component/subsystem weight 
and size. APS design point and sensitivities to design 
parameters and/or mission requirements can be obtained 
quickly with the program. 
The documentation consists of two volumes. Volume 
I contains a complete technical description of the APS 
including a description of subsystem operation; sub-
system/assembly design descriptions; delineation of the 
engineering analysis equations, including substantiation
of data; and sample cases showing program input/output. 
Volume II contains a program description and internal 
program nomenclature including a description of variable 
names and a detailed flow chart. 
The program could be revised to evaluate and 
optimize oxygen and hydrogen subsystem concepts for 
fuel cell and environmental control in space vehicles. 
Notes: 
1. This program is written in FORTRAN IV to be 
utilized on the CDC-6600 computer. 
2. Inquiries concerning this program should be directed 
to:
COSMIC 
112 Barrow Hail 
University of Georgia 
Athens, Georgia 30601 
Reference: MSC-14016 
Source: T. A. Kaemming and A. E. Burns of

McDonnell Douglas Corp. 
under contract to

Manned Spacecraft Center
(MSC-14016) 
Category 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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Propulsion sizing program

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