# Import from USAF Digital DATCOM Files

This example shows how to bring United States Air Force (USAF) Digital DATCOM files into the MATLAB® environment using the Aerospace Toolbox software.

### Example USAF Digital DATCOM File

Here's a sample input file for USAF Digital DATCOM for a wing-body-horizontal tail-vertical tail configuration running over 5 alphas, 2 Mach numbers, and 2 altitudes and calculating static and dynamic derivatives:

`type astdatcom.in`
``` \$FLTCON NMACH=2.0,MACH(1)=0.1,0.2\$ \$FLTCON NALT=2.0,ALT(1)=5000.0,8000.0\$ \$FLTCON NALPHA=5.,ALSCHD(1)=-2.0,0.0,2.0, ALSCHD(4)=4.0,8.0,LOOP=2.0\$ \$OPTINS SREF=225.8,CBARR=5.75,BLREF=41.15\$ \$SYNTHS XCG=7.08,ZCG=0.0,XW=6.1,ZW=-1.4,ALIW=1.1,XH=20.2, ZH=0.4,ALIH=0.0,XV=21.3,ZV=0.0,VERTUP=.TRUE.\$ \$BODY NX=10.0, X(1)=-4.9,0.0,3.0,6.1,9.1,13.3,20.2,23.5,25.9, R(1)=0.0,1.0,1.75,2.6,2.6,2.6,2.0,1.0,0.0\$ \$WGPLNF CHRDTP=4.0,SSPNE=18.7,SSPN=20.6,CHRDR=7.2,SAVSI=0.0,CHSTAT=0.25, TWISTA=-1.1,SSPNDD=0.0,DHDADI=3.0,DHDADO=3.0,TYPE=1.0\$ NACA-W-6-64A412 \$HTPLNF CHRDTP=2.3,SSPNE=5.7,SSPN=6.625,CHRDR=0.25,SAVSI=11.0, CHSTAT=1.0,TWISTA=0.0,TYPE=1.0\$ NACA-H-4-0012 \$VTPLNF CHRDTP=2.7,SSPNE=5.0,SSPN=5.2,CHRDR=5.3,SAVSI=31.3, CHSTAT=0.25,TWISTA=0.0,TYPE=1.0\$ NACA-V-4-0012 CASEID SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG DAMP NEXT CASE ```

Here's the output file generated by USAF Digital DATCOM for the same wing-body-horizontal tail-vertical tail configuration running over 5 alphas, 2 Mach numbers, and 2 altitudes:

`type astdatcom.out`
``` THIS SOFTWARE AND ANY ACCOMPANYING DOCUMENTATION IS RELEASED "AS IS". THE U.S. GOVERNMENT MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, CONCERNING THIS SOFTWARE AND ANY ACCOMPANYING DOCUMENTATION, INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL THE U.S. GOVERNMENT BE LIABLE FOR ANY DAMAGES, INCLUDING LOST PROFITS, LOST SAVINGS OR OTHER INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE, OR INABILITY TO USE, THIS SOFTWARE OR ANY ACCOMPANYING DOCUMENTATION, EVEN IF INFORMED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. **************************************************** * USAF STABILITY AND CONTROL DIGITAL DATCOM * * PROGRAM REV. JAN 96 DIRECT INQUIRIES TO: * * WRIGHT LABORATORY (WL/FIGC) ATTN: W. BLAKE * * WRIGHT PATTERSON AFB, OHIO 45433 * * PHONE (513) 255-6764, FAX (513) 258-4054 * **************************************************** 1 CONERR - INPUT ERROR CHECKING 0 ERROR CODES - N* DENOTES THE NUMBER OF OCCURENCES OF EACH ERROR 0 A - UNKNOWN VARIABLE NAME 0 B - MISSING EQUAL SIGN FOLLOWING VARIABLE NAME 0 C - NON-ARRAY VARIABLE HAS AN ARRAY ELEMENT DESIGNATION - (N) 0 D - NON-ARRAY VARIABLE HAS MULTIPLE VALUES ASSIGNED 0 E - ASSIGNED VALUES EXCEED ARRAY DIMENSION 0 F - SYNTAX ERROR 0****************************** INPUT DATA CARDS ****************************** \$FLTCON NMACH=2.0,MACH(1)=0.1,0.2\$ \$FLTCON NALT=2.0,ALT(1)=5000.0,8000.0\$ \$FLTCON NALPHA=5.,ALSCHD(1)=-2.0,0.0,2.0, ALSCHD(4)=4.0,8.0,LOOP=2.0\$ \$OPTINS SREF=225.8,CBARR=5.75,BLREF=41.15\$ \$SYNTHS XCG=7.08,ZCG=0.0,XW=6.1,ZW=-1.4,ALIW=1.1,XH=20.2, ZH=0.4,ALIH=0.0,XV=21.3,ZV=0.0,VERTUP=.TRUE.\$ \$BODY NX=10.0, X(1)=-4.9,0.0,3.0,6.1,9.1,13.3,20.2,23.5,25.9, R(1)=0.0,1.0,1.75,2.6,2.6,2.6,2.0,1.0,0.0\$ \$WGPLNF CHRDTP=4.0,SSPNE=18.7,SSPN=20.6,CHRDR=7.2,SAVSI=0.0,CHSTAT=0.25, TWISTA=-1.1,SSPNDD=0.0,DHDADI=3.0,DHDADO=3.0,TYPE=1.0\$ NACA-W-6-64A412 \$HTPLNF CHRDTP=2.3,SSPNE=5.7,SSPN=6.625,CHRDR=0.25,SAVSI=11.0, CHSTAT=1.0,TWISTA=0.0,TYPE=1.0\$ NACA-H-4-0012 \$VTPLNF CHRDTP=2.7,SSPNE=5.0,SSPN=5.2,CHRDR=5.3,SAVSI=31.3, CHSTAT=0.25,TWISTA=0.0,TYPE=1.0\$ NACA-V-4-0012 CASEID SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG DAMP NEXT CASE 1 THE FOLLOWING IS A LIST OF ALL INPUT CARDS FOR THIS CASE. 0 \$FLTCON NMACH=2.0,MACH(1)=0.1,0.2\$ \$FLTCON NALT=2.0,ALT(1)=5000.0,8000.0\$ \$FLTCON NALPHA=5.,ALSCHD(1)=-2.0,0.0,2.0, ALSCHD(4)=4.0,8.0,LOOP=2.0\$ \$OPTINS SREF=225.8,CBARR=5.75,BLREF=41.15\$ \$SYNTHS XCG=7.08,ZCG=0.0,XW=6.1,ZW=-1.4,ALIW=1.1,XH=20.2, ZH=0.4,ALIH=0.0,XV=21.3,ZV=0.0,VERTUP=.TRUE.\$ \$BODY NX=10.0, X(1)=-4.9,0.0,3.0,6.1,9.1,13.3,20.2,23.5,25.9, R(1)=0.0,1.0,1.75,2.6,2.6,2.6,2.0,1.0,0.0\$ \$WGPLNF CHRDTP=4.0,SSPNE=18.7,SSPN=20.6,CHRDR=7.2,SAVSI=0.0,CHSTAT=0.25, TWISTA=-1.1,SSPNDD=0.0,DHDADI=3.0,DHDADO=3.0,TYPE=1.0\$ NACA-W-6-64A412 \$HTPLNF CHRDTP=2.3,SSPNE=5.7,SSPN=6.625,CHRDR=0.25,SAVSI=11.0, CHSTAT=1.0,TWISTA=0.0,TYPE=1.0\$ NACA-H-4-0012 \$VTPLNF CHRDTP=2.7,SSPNE=5.0,SSPN=5.2,CHRDR=5.3,SAVSI=31.3, CHSTAT=0.25,TWISTA=0.0,TYPE=1.0\$ NACA-V-4-0012 CASEID SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG DAMP NEXT CASE 0 INPUT DIMENSIONS ARE IN FT, SCALE FACTOR IS 1.0000 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM WING SECTION DEFINITION 0 IDEAL ANGLE OF ATTACK = 0.00000 DEG. ZERO LIFT ANGLE OF ATTACK = -3.09292 DEG. IDEAL LIFT COEFFICIENT = 0.40000 ZERO LIFT PITCHING MOMENT COEFFICIENT = -0.08719 MACH ZERO LIFT-CURVE-SLOPE = 0.09654 /DEG. LEADING EDGE RADIUS = 0.00993 FRACTION CHORD MAXIMUM AIRFOIL THICKNESS = 0.12000 FRACTION CHORD DELTA-Y = 2.46808 PERCENT CHORD 0 MACH= 0.1000 LIFT-CURVE-SLOPE = 0.09693 /DEG. XAC = 0.26404 0 MACH= 0.2000 LIFT-CURVE-SLOPE = 0.09811 /DEG. XAC = 0.26457 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM HORIZONTAL TAIL SECTION DEFINITION 0 IDEAL ANGLE OF ATTACK = 0.00000 DEG. ZERO LIFT ANGLE OF ATTACK = 0.00000 DEG. IDEAL LIFT COEFFICIENT = 0.00000 ZERO LIFT PITCHING MOMENT COEFFICIENT = 0.00000 MACH ZERO LIFT-CURVE-SLOPE = 0.09596 /DEG. LEADING EDGE RADIUS = 0.01587 FRACTION CHORD MAXIMUM AIRFOIL THICKNESS = 0.12000 FRACTION CHORD DELTA-Y = 3.16898 PERCENT CHORD 0 MACH= 0.1000 LIFT-CURVE-SLOPE = 0.09636 /DEG. XAC = 0.25854 0 MACH= 0.2000 LIFT-CURVE-SLOPE = 0.09761 /DEG. XAC = 0.25881 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM VERTICAL TAIL SECTION DEFINITION 0 IDEAL ANGLE OF ATTACK = 0.00000 DEG. ZERO LIFT ANGLE OF ATTACK = 0.00000 DEG. IDEAL LIFT COEFFICIENT = 0.00000 ZERO LIFT PITCHING MOMENT COEFFICIENT = 0.00000 MACH ZERO LIFT-CURVE-SLOPE = 0.09596 /DEG. LEADING EDGE RADIUS = 0.01587 FRACTION CHORD MAXIMUM AIRFOIL THICKNESS = 0.12000 FRACTION CHORD DELTA-Y = 3.16898 PERCENT CHORD 0 MACH= 0.1000 LIFT-CURVE-SLOPE = 0.09636 /DEG. XAC = 0.25854 0 MACH= 0.2000 LIFT-CURVE-SLOPE = 0.09761 /DEG. XAC = 0.25881 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM CHARACTERISTICS AT ANGLE OF ATTACK AND IN SIDESLIP WING-BODY-VERTICAL TAIL-HORIZONTAL TAIL CONFIGURATION SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG ----------------------- FLIGHT CONDITIONS ------------------------ -------------- REFERENCE DIMENSIONS ------------ MACH ALTITUDE VELOCITY PRESSURE TEMPERATURE REYNOLDS REF. REFERENCE LENGTH MOMENT REF. CENTER NUMBER NUMBER AREA LONG. LAT. HORIZ VERT FT FT/SEC LB/FT**2 DEG R 1/FT FT**2 FT FT FT FT 0 0.100 5000.00 109.70 1.7609E+03 500.843 6.1507E+05 225.800 5.750 41.150 7.080 0.000 0 -------------------DERIVATIVE (PER DEGREE)------------------- 0 ALPHA CD CL CM CN CA XCP CLA CMA CYB CNB CLB 0 -2.0 0.032 0.113 -0.0340 0.112 0.035 -0.304 8.926E-02 -2.105E-02 -3.458E-03 9.142E-04 -6.161E-04 0.0 0.035 0.296 -0.0752 0.296 0.035 -0.254 9.350E-02 -2.034E-02 -6.205E-04 2.0 0.042 0.487 -0.1153 0.488 0.025 -0.236 9.732E-02 -1.971E-02 -6.268E-04 4.0 0.052 0.685 -0.1541 0.687 0.004 -0.224 1.005E-01 -1.927E-02 -6.349E-04 8.0 0.084 1.098 -0.2304 1.099 -0.069 -0.210 1.059E-01 -1.890E-02 -6.554E-04 0 ALPHA Q/QINF EPSLON D(EPSLON)/D(ALPHA) 0 -2.0 1.000 0.953 0.571 0.0 1.000 2.094 0.583 2.0 1.000 3.284 0.606 4.0 1.000 4.520 0.610 8.0 1.000 6.897 0.594 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM DYNAMIC DERIVATIVES WING-BODY-VERTICAL TAIL-HORIZONTAL TAIL CONFIGURATION SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG ----------------------- FLIGHT CONDITIONS ------------------------ -------------- REFERENCE DIMENSIONS ------------ MACH ALTITUDE VELOCITY PRESSURE TEMPERATURE REYNOLDS REF. REFERENCE LENGTH MOMENT REF. CENTER NUMBER NUMBER AREA LONG. LAT. HORIZ VERT FT FT/SEC LB/FT**2 DEG R 1/FT FT**2 FT FT FT FT 0 0.100 5000.00 109.70 1.7609E+03 500.843 6.1507E+05 225.800 5.750 41.150 7.080 0.000 DYNAMIC DERIVATIVES (PER DEGREE) 0 -------PITCHING------- -----ACCELERATION------ --------------ROLLING-------------- --------YAWING-------- 0 ALPHA CLQ CMQ CLAD CMAD CLP CYP CNP CNR CLR 0 -2.00 9.739E-02 -8.918E-02 1.874E-02 -4.247E-02 -7.824E-03 -1.516E-03 -1.498E-04 -1.059E-03 6.334E-04 0.00 1.913E-02 -4.336E-02 -8.226E-03 -1.649E-03 -4.034E-04 -1.068E-03 1.240E-03 2.00 1.991E-02 -4.512E-02 -8.599E-03 -1.792E-03 -6.631E-04 -1.073E-03 1.878E-03 4.00 2.003E-02 -4.540E-02 -8.890E-03 -1.942E-03 -9.290E-04 -1.073E-03 2.542E-03 8.00 1.952E-02 -4.424E-02 -9.387E-03 -2.262E-03 -1.479E-03 -1.060E-03 3.926E-03 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM CHARACTERISTICS AT ANGLE OF ATTACK AND IN SIDESLIP WING-BODY-VERTICAL TAIL-HORIZONTAL TAIL CONFIGURATION SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG ----------------------- FLIGHT CONDITIONS ------------------------ -------------- REFERENCE DIMENSIONS ------------ MACH ALTITUDE VELOCITY PRESSURE TEMPERATURE REYNOLDS REF. REFERENCE LENGTH MOMENT REF. CENTER NUMBER NUMBER AREA LONG. LAT. HORIZ VERT FT FT/SEC LB/FT**2 DEG R 1/FT FT**2 FT FT FT FT 0 0.200 5000.00 219.39 1.7609E+03 500.843 1.2301E+06 225.800 5.750 41.150 7.080 0.000 0 -------------------DERIVATIVE (PER DEGREE)------------------- 0 ALPHA CD CL CM CN CA XCP CLA CMA CYB CNB CLB 0 -2.0 0.028 0.114 -0.0335 0.113 0.032 -0.297 9.000E-02 -2.124E-02 -3.465E-03 8.781E-04 -6.226E-04 0.0 0.031 0.298 -0.0751 0.298 0.031 -0.252 9.421E-02 -2.051E-02 -6.270E-04 2.0 0.038 0.491 -0.1155 0.492 0.021 -0.235 9.800E-02 -1.987E-02 -6.332E-04 4.0 0.048 0.690 -0.1546 0.692 0.000 -0.223 1.011E-01 -1.943E-02 -6.413E-04 8.0 0.081 1.105 -0.2316 1.106 -0.074 -0.209 1.065E-01 -1.906E-02 -6.614E-04 0 ALPHA Q/QINF EPSLON D(EPSLON)/D(ALPHA) 0 -2.0 1.000 0.957 0.573 0.0 1.000 2.103 0.585 2.0 1.000 3.297 0.609 4.0 1.000 4.537 0.612 8.0 1.000 6.923 0.596 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM DYNAMIC DERIVATIVES WING-BODY-VERTICAL TAIL-HORIZONTAL TAIL CONFIGURATION SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG ----------------------- FLIGHT CONDITIONS ------------------------ -------------- REFERENCE DIMENSIONS ------------ MACH ALTITUDE VELOCITY PRESSURE TEMPERATURE REYNOLDS REF. REFERENCE LENGTH MOMENT REF. CENTER NUMBER NUMBER AREA LONG. LAT. HORIZ VERT FT FT/SEC LB/FT**2 DEG R 1/FT FT**2 FT FT FT FT 0 0.200 5000.00 219.39 1.7609E+03 500.843 1.2301E+06 225.800 5.750 41.150 7.080 0.000 DYNAMIC DERIVATIVES (PER DEGREE) 0 -------PITCHING------- -----ACCELERATION------ --------------ROLLING-------------- --------YAWING-------- 0 ALPHA CLQ CMQ CLAD CMAD CLP CYP CNP CNR CLR 0 -2.00 9.840E-02 -8.993E-02 1.900E-02 -4.307E-02 -7.877E-03 -1.525E-03 -1.499E-04 -1.057E-03 6.448E-04 0.00 1.940E-02 -4.398E-02 -8.276E-03 -1.659E-03 -4.038E-04 -1.066E-03 1.264E-03 2.00 2.018E-02 -4.574E-02 -8.646E-03 -1.802E-03 -6.637E-04 -1.070E-03 1.915E-03 4.00 2.030E-02 -4.602E-02 -8.934E-03 -1.953E-03 -9.297E-04 -1.070E-03 2.593E-03 8.00 1.978E-02 -4.483E-02 -9.423E-03 -2.273E-03 -1.479E-03 -1.057E-03 4.003E-03 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM CHARACTERISTICS AT ANGLE OF ATTACK AND IN SIDESLIP WING-BODY-VERTICAL TAIL-HORIZONTAL TAIL CONFIGURATION SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG ----------------------- FLIGHT CONDITIONS ------------------------ -------------- REFERENCE DIMENSIONS ------------ MACH ALTITUDE VELOCITY PRESSURE TEMPERATURE REYNOLDS REF. REFERENCE LENGTH MOMENT REF. CENTER NUMBER NUMBER AREA LONG. LAT. HORIZ VERT FT FT/SEC LB/FT**2 DEG R 1/FT FT**2 FT FT FT FT 0 0.100 8000.00 108.52 1.5721E+03 490.151 5.6457E+05 225.800 5.750 41.150 7.080 0.000 0 -------------------DERIVATIVE (PER DEGREE)------------------- 0 ALPHA CD CL CM CN CA XCP CLA CMA CYB CNB CLB 0 -2.0 0.032 0.113 -0.0340 0.112 0.036 -0.305 8.926E-02 -2.106E-02 -3.458E-03 9.190E-04 -6.161E-04 0.0 0.035 0.296 -0.0753 0.296 0.035 -0.254 9.350E-02 -2.034E-02 -6.205E-04 2.0 0.042 0.487 -0.1154 0.488 0.025 -0.236 9.732E-02 -1.971E-02 -6.268E-04 4.0 0.052 0.685 -0.1541 0.687 0.004 -0.224 1.005E-01 -1.927E-02 -6.349E-04 8.0 0.085 1.098 -0.2304 1.099 -0.069 -0.210 1.059E-01 -1.891E-02 -6.554E-04 0 ALPHA Q/QINF EPSLON D(EPSLON)/D(ALPHA) 0 -2.0 1.000 0.953 0.571 0.0 1.000 2.094 0.583 2.0 1.000 3.284 0.606 4.0 1.000 4.520 0.610 8.0 1.000 6.897 0.594 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM DYNAMIC DERIVATIVES WING-BODY-VERTICAL TAIL-HORIZONTAL TAIL CONFIGURATION SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG ----------------------- FLIGHT CONDITIONS ------------------------ -------------- REFERENCE DIMENSIONS ------------ MACH ALTITUDE VELOCITY PRESSURE TEMPERATURE REYNOLDS REF. REFERENCE LENGTH MOMENT REF. CENTER NUMBER NUMBER AREA LONG. LAT. HORIZ VERT FT FT/SEC LB/FT**2 DEG R 1/FT FT**2 FT FT FT FT 0 0.100 8000.00 108.52 1.5721E+03 490.151 5.6457E+05 225.800 5.750 41.150 7.080 0.000 DYNAMIC DERIVATIVES (PER DEGREE) 0 -------PITCHING------- -----ACCELERATION------ --------------ROLLING-------------- --------YAWING-------- 0 ALPHA CLQ CMQ CLAD CMAD CLP CYP CNP CNR CLR 0 -2.00 9.739E-02 -8.918E-02 1.874E-02 -4.247E-02 -7.824E-03 -1.516E-03 -1.498E-04 -1.060E-03 6.334E-04 0.00 1.913E-02 -4.336E-02 -8.226E-03 -1.649E-03 -4.034E-04 -1.069E-03 1.240E-03 2.00 1.991E-02 -4.512E-02 -8.599E-03 -1.792E-03 -6.631E-04 -1.073E-03 1.878E-03 4.00 2.003E-02 -4.540E-02 -8.890E-03 -1.942E-03 -9.290E-04 -1.074E-03 2.542E-03 8.00 1.952E-02 -4.424E-02 -9.387E-03 -2.262E-03 -1.479E-03 -1.061E-03 3.926E-03 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM CHARACTERISTICS AT ANGLE OF ATTACK AND IN SIDESLIP WING-BODY-VERTICAL TAIL-HORIZONTAL TAIL CONFIGURATION SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG ----------------------- FLIGHT CONDITIONS ------------------------ -------------- REFERENCE DIMENSIONS ------------ MACH ALTITUDE VELOCITY PRESSURE TEMPERATURE REYNOLDS REF. REFERENCE LENGTH MOMENT REF. CENTER NUMBER NUMBER AREA LONG. LAT. HORIZ VERT FT FT/SEC LB/FT**2 DEG R 1/FT FT**2 FT FT FT FT 0 0.200 8000.00 217.04 1.5721E+03 490.151 1.1291E+06 225.800 5.750 41.150 7.080 0.000 0 -------------------DERIVATIVE (PER DEGREE)------------------- 0 ALPHA CD CL CM CN CA XCP CLA CMA CYB CNB CLB 0 -2.0 0.028 0.114 -0.0335 0.113 0.032 -0.297 9.000E-02 -2.124E-02 -3.465E-03 8.829E-04 -6.226E-04 0.0 0.031 0.298 -0.0751 0.298 0.031 -0.252 9.421E-02 -2.051E-02 -6.270E-04 2.0 0.038 0.491 -0.1156 0.492 0.021 -0.235 9.800E-02 -1.987E-02 -6.332E-04 4.0 0.049 0.690 -0.1546 0.692 0.000 -0.223 1.011E-01 -1.943E-02 -6.413E-04 8.0 0.081 1.105 -0.2316 1.106 -0.073 -0.209 1.065E-01 -1.906E-02 -6.614E-04 0 ALPHA Q/QINF EPSLON D(EPSLON)/D(ALPHA) 0 -2.0 1.000 0.957 0.573 0.0 1.000 2.103 0.585 2.0 1.000 3.297 0.609 4.0 1.000 4.537 0.612 8.0 1.000 6.923 0.596 1 AUTOMATED STABILITY AND CONTROL METHODS PER APRIL 1976 VERSION OF DATCOM DYNAMIC DERIVATIVES WING-BODY-VERTICAL TAIL-HORIZONTAL TAIL CONFIGURATION SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG ----------------------- FLIGHT CONDITIONS ------------------------ -------------- REFERENCE DIMENSIONS ------------ MACH ALTITUDE VELOCITY PRESSURE TEMPERATURE REYNOLDS REF. REFERENCE LENGTH MOMENT REF. CENTER NUMBER NUMBER AREA LONG. LAT. HORIZ VERT FT FT/SEC LB/FT**2 DEG R 1/FT FT**2 FT FT FT FT 0 0.200 8000.00 217.04 1.5721E+03 490.151 1.1291E+06 225.800 5.750 41.150 7.080 0.000 DYNAMIC DERIVATIVES (PER DEGREE) 0 -------PITCHING------- -----ACCELERATION------ --------------ROLLING-------------- --------YAWING-------- 0 ALPHA CLQ CMQ CLAD CMAD CLP CYP CNP CNR CLR 0 -2.00 9.840E-02 -8.993E-02 1.900E-02 -4.307E-02 -7.877E-03 -1.525E-03 -1.499E-04 -1.057E-03 6.448E-04 0.00 1.940E-02 -4.398E-02 -8.276E-03 -1.659E-03 -4.038E-04 -1.066E-03 1.264E-03 2.00 2.018E-02 -4.574E-02 -8.646E-03 -1.802E-03 -6.637E-04 -1.071E-03 1.915E-03 4.00 2.030E-02 -4.602E-02 -8.934E-03 -1.953E-03 -9.297E-04 -1.071E-03 2.593E-03 8.00 1.978E-02 -4.483E-02 -9.424E-03 -2.273E-03 -1.479E-03 -1.057E-03 4.003E-03 1 THE FOLLOWING IS A LIST OF ALL INPUT CARDS FOR THIS CASE. 0 1 END OF JOB. ```

### Import Data from DATCOM Files

Use the datcomimport function to bring the Digital DATCOM data into MATLAB.

`alldata = datcomimport('astdatcom.out', true, 0);`

### Examining Imported DATCOM Data

The datcomimport function creates a cell array of structures containing the data from the Digital DATCOM output file.

`data = alldata{1}`
```data = struct with fields: case: 'SKYHOGG BODY-WING-HORIZONTAL TAIL-VERTICAL TAIL CONFIG' mach: [0.1000 0.2000] alt: [5000 8000] alpha: [-2 0 2 4 8] nmach: 2 nalt: 2 nalpha: 5 rnnub: [] hypers: 0 loop: 2 sref: 225.8000 cbar: 5.7500 blref: 41.1500 dim: 'ft' deriv: 'deg' stmach: 0.6000 tsmach: 1.4000 save: 0 stype: [] trim: 0 damp: 1 build: 1 part: 0 highsym: 0 highasy: 0 highcon: 0 tjet: 0 hypeff: 0 lb: 0 pwr: 0 grnd: 0 wsspn: 18.7000 hsspn: 5.7000 ndelta: 0 delta: [] deltal: [] deltar: [] ngh: 0 grndht: [] config: [1x1 struct] version: 1976 cd: [5x2x2 double] cl: [5x2x2 double] cm: [5x2x2 double] cn: [5x2x2 double] ca: [5x2x2 double] xcp: [5x2x2 double] cma: [5x2x2 double] cyb: [5x2x2 double] cnb: [5x2x2 double] clb: [5x2x2 double] cla: [5x2x2 double] qqinf: [5x2x2 double] eps: [5x2x2 double] depsdalp: [5x2x2 double] clq: [5x2x2 double] cmq: [5x2x2 double] clad: [5x2x2 double] cmad: [5x2x2 double] clp: [5x2x2 double] cyp: [5x2x2 double] cnp: [5x2x2 double] cnr: [5x2x2 double] clr: [5x2x2 double] ```

### Filling in Missing DATCOM Data

By default, missing data points are set to 99999 and data points are set to NaN where no DATCOM methods exist or where the method is not applicable.

It can be seen in the Digital DATCOM output file and examining the imported data that

${C}_{Y\beta },$ ${C}_{n\beta },$ ${C}_{Lq},$ and ${C}_{mq}$

have data only in the first alpha value. Here are the imported data values.

`data.cyb`
```ans = ans(:,:,1) = 1.0e+04 * -0.0000 -0.0000 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 ans(:,:,2) = 1.0e+04 * -0.0000 -0.0000 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 ```
`data.cnb`
```ans = ans(:,:,1) = 1.0e+04 * 0.0000 0.0000 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 ans(:,:,2) = 1.0e+04 * 0.0000 0.0000 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 ```
`data.clq`
```ans = ans(:,:,1) = 1.0e+04 * 0.0000 0.0000 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 ans(:,:,2) = 1.0e+04 * 0.0000 0.0000 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 ```
`data.cmq`
```ans = ans(:,:,1) = 1.0e+04 * -0.0000 -0.0000 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 ans(:,:,2) = 1.0e+04 * -0.0000 -0.0000 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 9.9999 ```

The missing data points are filled with the values for the first alpha, since these data points are meant to be used for all alpha values.

```aerotab = ["cyb", "cnb", "clq", "cmq"]; for tab = aerotab data.(tab) = fillmissing(data.(tab), "previous", MissingLocations=data.(tab)==99999); end```

Here are the updated imported data values:

`data.cyb`
```ans = ans(:,:,1) = -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 ans(:,:,2) = -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 -0.0035 ```
`data.cnb`
```ans = ans(:,:,1) = 1.0e-03 * 0.9142 0.8781 0.9142 0.8781 0.9142 0.8781 0.9142 0.8781 0.9142 0.8781 ans(:,:,2) = 1.0e-03 * 0.9190 0.8829 0.9190 0.8829 0.9190 0.8829 0.9190 0.8829 0.9190 0.8829 ```
`data.clq`
```ans = ans(:,:,1) = 0.0974 0.0984 0.0974 0.0984 0.0974 0.0984 0.0974 0.0984 0.0974 0.0984 ans(:,:,2) = 0.0974 0.0984 0.0974 0.0984 0.0974 0.0984 0.0974 0.0984 0.0974 0.0984 ```
`data.cmq`
```ans = ans(:,:,1) = -0.0892 -0.0899 -0.0892 -0.0899 -0.0892 -0.0899 -0.0892 -0.0899 -0.0892 -0.0899 ans(:,:,2) = -0.0892 -0.0899 -0.0892 -0.0899 -0.0892 -0.0899 -0.0892 -0.0899 -0.0892 -0.0899 ```

### Plotting Aerodynamic Coefficients

Plot lift curve, drag polar, and pitching moments.

```h1 = figure; figtitle = {'Lift Curve' ''}; for k=1:2 subplot(2,1,k) plot(data.alpha,permute(data.cl(:,k,:),[1 3 2])) grid ylabel(['Lift Coefficient (Mach =' num2str(data.mach(k)) ')']) title(figtitle{k}); end xlabel('Angle of Attack (deg)')```

```h2 = figure; figtitle = {'Drag Polar' ''}; for k=1:2 subplot(2,1,k) plot(permute(data.cd(:,k,:),[1 3 2]),permute(data.cl(:,k,:),[1 3 2])) grid ylabel(['Lift Coefficient (Mach =' num2str(data.mach(k)) ')']) title(figtitle{k}) end xlabel('Drag Coefficient')```

```h3 = figure; figtitle = {'Pitching Moment' ''}; for k=1:2 subplot(2,1,k) plot(permute(data.cm(:,k,:),[1 3 2]),permute(data.cl(:,k,:),[1 3 2])) grid ylabel(['Lift Coefficient (Mach =' num2str(data.mach(k)) ')']) title(figtitle{k}) end xlabel('Pitching Moment Coefficient')```