(41) Helicopter Programs

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An extract from Helicopter Performance Computer Programs for HP-41 Hand-Held Computer, Prof Donald M. Layton, Department of Aeronautics, Naval Postgraduate School, DEC 1985, 72 pgs.

"INTRODUCTION
These programs present the user of the HP-41 hand-held, programable calculator with a series of self-prompting, alphanumeric programs that can be used with acceptable results to compute and evaluate helicopter performance. Most of the programs are structured so as to be more expedient when doing preliminary helicopter design where intermediate values are of less a concern than would be the case when studying detailed performance.
By presenting only the principal, bottom line', values, the programs are shorter than if all of the intermediate values were displayed. However, with the establishment of a standard storage register routine (see Tables I and II), any intermediate value may be readily located and displayed by using the RCL routine …
The basic equations and assumptions inherent in these programs are from "Helicopter Performance" (reference 1) and "Helicopter Design Manual (reference 2), both by Professor Donald M. Layton. These materials are used regularly in helicopter performance and design courses at the Naval Postgraduate School, Monterey, California.
The programs have been written in a consolidated manner, thus reducing the need to load numerous individual subroutines in order to run a single program. Because of this, many of the programs are quite large and use a considerable amount of the available space in the resident memory of the HP-41CV. If a HP-41C is to be used a Quad Memory Module is required. The option to operate a specific subroutine is maintained for most of the programs …
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Each program is documented in essentially the same manner. Listed alphabetically, each program documentation begins with the name of the program (as it appears in the execute statement) and a short phrase that describes the program. This is followed by the introduction which states the purpose of the program, explains the applicability of the program, and describes any assumptions inherent in the program.
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These programs are all written in British Units. If it is desired to convert to SI Units it is only necessary to modify the aerodynamic parameters …
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These programs have been prepared, revised, modified and edited over a several years … the Aeronautics Programs at the Naval Postgraduate School …"

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