Contrails
The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

The Functional Design of a Special-purpose Digital Computer for Real-time Flight Simulation

Report Number: MRL TDR 62-39
Author(s): Louis M. Krasny
Corporate Author: Massachusetts Institute of Technology
Laboratory: Behavioral Sciences Laboratory
Date of Publication: 1962-04
Pages: 124
Contract: AF 33(616)-8363
Project: 6114
Task: 611411
AD Number: AD0283099

Abstract:
To determine the ability of a moderate-sized digital computer, such as the M. I. T. TX-O, to solve a complex real-time flight simulation problem, the complete equations for the unrestricted simulation of the F-100A aircraft have been programmed using the TX-O order code. From an analysis of this program, specific recommendations are made for logical modifications of the TX-O to facilitate real-time simulation. With nine additional orders, including a 25 micro sec. addressable multiply, a 40 micro sec. divide, and a special level-sense order to facillitate nonlinear function generation, the TX-O would solve the full F-100A equations at 23 solutions per second. The areas of function generation, order code specification, usage of subroutines, integration, word length requirement, input and output procedures, decision-making, and high-speed, multiplication are investigated in detail with quantitative comparisions between different methods wherever possible. Although the emphasis of this study has been on the specific requirements of the F-100A problem, the deisgn methodology and the various design trade-offs described should be applicable to the functional analysis of other simulation problems of greater or lesser complexity.

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