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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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. Articles lacking in-text citations from March All articles lacking in-text citations. All dimensions are taken in feet and degrees unless specified otherwise.
An alpha version of the program was released November 1, to the general public. The X- and Z- coordinates are needed for the winghorizontal tailand vertical tail in order for the aircraft to be synthesized correctly.
Three damage-configurations are studied at supersonic speeds. Retrieved from ” https: This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations. Incidence angles can also be added to the wing and horizontal tail. However, in its day, the program was an advanced estimation tool, and certainly much faster than plowing through pages and pages of engineering texts.
Digital DATCOM requires an input file containing datcoj geometric description of an aircraft, and outputs its corresponding dimensionless stability derivatives according to the specified flight conditions. Raw results from the code provide good correlation datcm wind tunnel data at very low angles of attack, but accuracy deteriorates rapidly as the angle of attack increases. Views Read Edit View history. This problem can be addressed by superposition of lifting surfaces through the experimental input option.
Additionally, custom airfoils can be input using the appropriate namelists. The new input file format allows the user to place comments in the input file.
United States Air Force Stability and Control Digital 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.
There has been some research in using Digital DATCOM in conjunction with wind tunnel studies to predict aerodynamics of structurally impaired aircraft. For supersonic analysis, additional parameters can be input. The user can specify whether the Mach number and altitude varies together, the Mach number varies at a constant altitude, or the altitude varies at a constant Mach number.
OpenDatcom incorporates all the basic non-experimental functionality supported by the Digital DATCOM while providing real-time input error and bounds checking. While the original DIGDAT program has been left relatively untouched, there has been a new front-end created that will allow the manuxl to name the input file with something more significant than FOR Dactom methodology can be used to quickly generate manuaal model for damaged aircraft for simulation and reconfigurable control. There is no method to input twin vertical tails mounted on the fuselage, although there is a method for H-Tails.
March Learn how and when mannual remove this template message. 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.
The report consists of. The manial parameters such as root chord, tip chord, half-span, twistdihedral and sweep are input. Up to 9 flap deflections can be analyzed at each Mach-altitude combination.
The manuaal affects the coefficient of drag for the aircraft. 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. For each configuration, stability coefficients and derivatives are output at each angle of attack specified.
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. From Wikipedia, the free encyclopedia. This page was last edited on 22 Decemberat The values obtained can be used to calculate meaningful aspects of flight dynamics.
The basic output includes:. The canard must be specified as the forward lifting surface i. According to the manual, there is no any input parameters which define the geometriy of rudder. The theoretical wing area, mean aerodynamic chordand wing span are input along with a parameter defining the surface roughness of the aircraft.
Up to 20 stations can be specified with the fuselage half-width, upper coordinate and lower coordinate being defined at each station. Data tables can easily be output to the screen or to PNG files for inclusion into reports. This problem can be addressed by approximating the twin vertical tails as a single equivalent vertical tail mounted to the fuselage.
USAF Digital Datcom
By default, only the data for the aircraft is output, but additional configurations can be output:. Dynamic derivatives are not output for aircraft that have wings that are not straight-tapered or have leading edge extensions.
This problem can be overcome by using experimental data for the wing-body using non-straight tapered wing.