DTIC ADA231500: Aeroballistic Performance of the 25mm M910 TPDS-T Range Limited Training Projectile

56 Pages·2.1 MB·English

by  Defense Technical Information Center

*RWILif-I-S6
MEMORANDUM REPORT BRL-MR-3886
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0
T- AEROBALLISTIC PERFORMANCE OF THE
25MM M910 TPDS-T RANGE LIMITED
N TRAINING PROJECTILE
€I
PETER PLOSTINS
ROBERT L. McCOY
BARBARA A. WAGONER
DTIC
, ELECTE I
FEFB0 5 1991D
E
JANUARY 1991 U
APPROVED FOR PUBLIC RELEASE; DISTRBUrION UNLIMTED.
U.S. ARMY LABORATORY COMMAND
BALLISTIC RESEARCH LABORATORY
ABERDEEN PROVING GROUND, MARYLAND
91 2 04 149
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1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED
Januar 1991 Final 1 Oct 88 - 1 Oct go
4. TITLE AND SUBTITLE S. FUNDING NUMBERS
AEROBALLISTIC PERFORMANCE OF THE 25MM M910 TPDS-T
RANGE LIMITED TRAINING PROJECTILE 1L162618AH80'1
6. AUTHOR(S)
Peter Plostins
Robert L. McCoy
Barbara A. Wagoner
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) B. PERFORMING ORGANIZATION
US Army Ballistic Research Laboratory REPORT NUMBER
ATTN: SLCBR-LF
Aberdeen Proving Ground, MD 21005-5066
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADORESS(ES) 10. SPONSORING/MONITORING
US Army Ballistic Research Laboratory AGENCY REPORT NUMBER
ATTN: SLCBR-DD-T BIL-f-3886
Aberdeen Proving Ground, MD 21005-5066
11. SUPPLEMENTARY NOTES
12a. DISTRIBUTION / AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE
Approved for public release;
distribution unlimited.
13. ABSTRACT (Maximum 200 words)
The U.S. Army has developed a 25mm spin-stabilized, sabot-launched, limited-
range training projectile for the Bradley Fighting Vehicle M242 Chain Gun. It is
designed to be a ballistic match to the service ammunition and is designated the
M910 TPDS-T. The acronym stands for "armor-piercing target-practice - traced."
The specified maximum range of the projectile is 8000 meters. During prototype
testing at Fort Bliss, Texas, it was determined that the maximum range measured
by radar was significantly shorter than had been predicted. Subsequent
analysis determined that the projectile had anomalous subsonic aeroballistic
performance. Firing tables and range safety data were required to certify the
projectile for general use; therefore, extensive aeroballistic tests were ordered
to determine the supersonic and subsonic aerodynamic characteristics of the pro-
jectile. This report documents the results of those aeroballistic tests.
14. SUBJECT TERMS 25mm training projectile; training ammunition; IS. NUMBER OF PAGES
aeroballistic coefficients; spin-stabilized-sabot-launched- 49
projectile; non-linear aeroballistics; BFV 25mm ammunition; 16. PRICE CODE
aerodynamic characteristics
17. SECURITY CLASSIFICATION IS. SECURITY CLASSIFICATION 19. SECURITY CLASSIFICATION 20. LIMITATION OF ABSTRACT
OF REPORT OF THIS PAGE OF ABSTRACT
UNCLASSIFIED UNCLASSIFIED UNCLASSIFIED Same as Report
NSN 75,0-01-2B0-5500 UNCLASSIFIED Standard Form 298 (Rev 2-89)
eb, ANSSItd Z39-1 8
INrENTIONALLY LEFr BLANK.
TABLE OF CONTENTS
List of Figures..................................................v
List of Tables ................................................. vii
I. Introduction .................................................. 1
II. Test Instrumentation and Procedures .................................. 2
IIl. Analysis of the Data .. ............................................ 4
a.) Drag Coefficient ............................. ................. 4
b.) Overturning Moment Coefficient .................................. 5
c.) Gyroscopic Stability ........................................... 5
d.) Lift Force Coefficient .......................................... 6
e.) Magnus Moment and Pitch Damping Coefficient ......................... 6
f.) Epicyclic Damping Rates ........................................ 8
g.) Spin Damping Moment Coefficient ................................. 8
IV. Trajectory Analysis ............................................. 9
V . Conclusions . .................................................. 10
References .. ................................................... 37
Accession For
List of Symbols ....................... " " . .. .. .. ..... 39
DTIC TAB
Distribution List ...................... Unannounced ..... 0 ......... 43
Justificatlon
BY
Distribution/
Availability Codes
Dist Special
INT-ENTIONALLY LEFT BLANK.
iv
LIST OF FIGURES
Figure Page
1 Schematic of the M791 APDS-T Service Projectile .......................... 12
2a Schematic of the M9 10 TPDS-T Training Projectile.......................... 12
2b Photograph of the M910 TPDS-T Sabot, Pusher and Sub-Projectile .............. 13
3 Ft. Bliss, Texas, Midi Radar Data versus Point Mass Trajectory Prediction ......... 13
4 Sabot Mo difications .............................................. 14
5 Pusher M odifications ............................................. 14
6 20 mm Sabot for the M910 TPDS-T and Sub-Projectile Modifications ............ 15
7a Supersonic Flow Field Shadowgraph: M. = 4.49 ............................ 16
7b Transonic Flow Field Shadowgraph: M , = 1.009 ......................... 17
7c Transonic Flow Field Shadowgraph: Mo = 0.90 ............................ 18
7d Subsonic Flow Field Shadowgraph: Moo = 0.625 .......................... 19
7e High Yaw Subsonic Flow Field Shadowgraph: M.0 = 0.62 .................... 19
8a Zero-Yaw Drag Coefficient versus Mach Number ........................... 20
8b Quadratic-Yaw Drag Coefficient versus Mach Number ....................... 20
9 Drag Coefficient Data Summary ..................................... 21
10a Zero-Yaw Overturning Moment Coefficient versus Mach Number ............... 22
10b Cubic Overturning Moment Coefficient versus Mach Number ................... 22
Ila Zero-Yaw Lift Coefficient versus Mach Number ........................... 23
lib Cubic Lift Coefficient versus Mach Number ............................ 23
12a Magnus Moment Coefficient versus Effective Yaw Squared ..................... 24
v
LIST OF FIGURES
(continued )
Fi~rePage
12b Zero-Yaw Magnus Moment Coefficient versus Mach Number ................. 24
12c Cubic Magnus Moment Coefficient versus Mach Number .................... 25
13a Zero-Yaw Pitch Damping Moment Coefficient versus Mach Number ............ 25
13b Cubic Pitch Damping Moment Coefficient versus Mach Number ............... 26
14a Slow Arm Damping Rate versus Effective Yaw Squared: Mo = 0.70 ............ 26
14b Zero-Yaw Slow Arm Damping Rate versus Mach Number ................... 27
15 Spin Damping Moment Coefficient versus Mach Number .................... 27
16 Ft. Bliss 6 Degree-of-Freedom Trajectory .............................. 28
17 Ft. Bliss Trajectory: Mach Number versus Range ......................... 28
18 Ft. Bliss Trajectory: Velocity versus Range ............................. 29
19 Ft. Bliss Trajectory: Mach Number versus Time .......................... 29
20 Ft. Bliss Trajectory- Total Angle of Attack versus Range ................... 30
21 Ft. Bliss Trajectory: Dynamic Stability versus Range ....................... 30
22 Sea Level Trajectory- Height versus Range ............................. 31
23 Sea Level Trajectory: Velocity versus Range ............................. 31
vi
LIST OF TABLES
Table Pag
I Projectile Physical Properties of the M910 TPDS-T ......................... 32
2 Range Values of Aerodynamic Coefficients of the M910 TPDS-T .............. 33
3 Range Values of Flight Motion Parameters of the M910 TPDS-T ................ 35
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