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