This report is a User’s Manual for the Revision of the Missile Datcom computer program. It supersedes. AFRL-RB-WP-TR How to order printed copies of the USAF Data Compendium for Stability and Control (DATCOM). The user’s manual (on the disc) presents the program capabilities, input This page has links to the user’s manual for Digital Datcom and the.
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The new input file format allows the user datvom place comments in the input file. Incidence angles can also be added to the wing and horizontal tail.
There has been some research in using Digital DATCOM in conjunction with wind tunnel studies to predict aerodynamics of structurally impaired aircraft. Retrieved from ” https: The basic parameters such as root chord, tip chord, half-span, twistdihedral and sweep are input.
There is no method to input twin vertical tails mounted on the fuselage, although there is a method for H-Tails. From Wikipedia, the free encyclopedia. Three damage-configurations are studied at supersonic speeds.
There have also been hooks placed in the DIGDAT that allow for alternate outputs in addition to the original output format, which is columns wide and slightly user abusive if you intend to import the data into another application. This problem can be addressed by superposition of lifting surfaces through the experimental input option.
According to the manual, there is no any input parameters which define the geometriy of rudder. There are intentions among those that use this package to improve the overall package, through an easier user interface, as well as more comprehensive output data.
Dynamic derivatives are not output for aircraft that have wings that are not straight-tapered or have leading edge extensions. This page was last edited on 22 Decemberat Raw results from the code provide good correlation with wind tunnel data at very low angles of attack, but accuracy deteriorates rapidly as the angle of attack increases.
The X- and Z- coordinates are needed for the winghorizontal tailand vertical tail in order for the aircraft to be synthesized correctly.
USAF Digital Datcom
Digital DATCOM requires an input file containing a geometric description of an aircraft, and outputs its corresponding dimensionless stability derivatives according to the specified flight conditions. By default, only the data for the aircraft is output, but additional manuao can be output:. Articles lacking in-text citations from March All articles lacking in-text citations. The canard must be specified as the datdom lifting surface i.
However, in its day, the program was an advanced estimation tool, and certainly much faster than plowing through pages and pages of engineering texts. For supersonic analysis, additional parameters can be input. This problem can be overcome by using experimental data for the wing-body using non-straight tapered wing.
This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations. For complete aircraft configurations, downwash data is also included. A maximum of Mach-altitude combinations can be run at once, with up to 20 angles of attack for each combination.
All dimensions are taken in feet and degrees unless specified otherwise. While the original DIGDAT program has been left relatively untouched, there has been a new front-end created that will allow the user to name the input file with something more significant manuap FOR Up to 9 flap deflections can be analyzed dafcom each Mach-altitude combination.
March Learn how and when to remove this template message. Up to 20 stations can be specified with the fuselage half-width, upper coordinate and lower coordinate being defined at each station.
Printed Manuals for USAF Datcom
A new methodology is then proposed which combines the experimental results of healthy aircraft with the predicted aerodynamics of the damaged cases, to yield better correlation between experimental and predicted aerodynamic coefficients for damaged aircraft. DATCOM does not require that the origin for the aircraft has to be the nose of the aircraft; any arbitrary point will do, but all of the dimensions need to be referenced from that point.
An alpha version of the program was released November 1, to the general public. Additionally, custom datcoom can be input using the appropriate namelists. The report consists of. The user can specify whether the Mach number and vatcom varies together, the Mach number varies at a constant altitude, or the altitude varies at a constant Mach number.
This problem can be addressed by approximating the twin vertical tails as a single equivalent vertical tail mounted to the fuselage.