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Please use this identifier to cite or link to this item:
http://hdl.handle.net/1947/3986
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| Title: | An aerodynamic database for the Mk 82 Purpose Purpose Low Drag bomb |
| Report number: | DSTO-TR-0554 |
| AR number: | AR-010-269 |
| Classification: | UNCLASSIFIED |
| Report type: | Technical Report |
| Authors: | Krishnamoorthy, L.V.
Kirk, D.R.
Glass, R. |
| Issue Date: | 1997-07 |
| Division: | Weapons Systems Division |
| Abbreviation: | WSD |
| Release authority: | Chief, Weapons Systems Division |
| Release limitations: | PUBLIC RELEASE |
| Announce limitations: | Public Announce |
| Task sponsor: | DGAD |
| Task number: | ADA 95/268 |
| File number: | J9505/13/27 |
| Pages or format: | 25 |
| References: | 27 |
| DSTORL/DEFTEST terms: | F-111C aircraft
Mk-82 bombs
Aerodynamic drag |
| Abstract: | The drag database of the Mk 82 Purpose Purpose Low Drag bomb, the primary gravity weapon in the RAAF inventory, has some shortcomings in the quality and traceability of data, and in the variations due to configural differences. Extensive testing of scaled models in a wind tunnel and an aeroballistic range facility have resulted in establishing estimates of the drag of a clean Mk 82 bomb as well as the incremental drag of add ons such as lugs and fuzes. These results, together with data obtained from full scale bomb trials, have been used to produce drag estimates for a full range of bomb configurations and conditions. conditions. It is recommended that these data be incorporated into the mission computer of the weapon delivery system of the updated F111C aircraft. Furthermore it is recommended that the accuracy of these data be validated when the updated aircraft undergoes Ballistic Accuracy Verification flight trials. |
| Executive summary: | The Mk 82 500-lb General Purpose (GP) is a high explosive bomb which can be configured in either a low drag, high drag, laser guided or shallow water mode
depending upon the operational requirement. The store can be fitted with different fuzes such as M904 nose fuze, M905 tail fuze for initiation of detonation. Depending upon the type of aircraft, the Mk 82 bomb uses T type or D type suspension lugs.
The Mk 82 General Purpose Low Drag (GPLD) is the primary gravity drop weapon in RAAF's inventory. The trajectory and subsequent impact point of the bomb released by the aircraft weapon system depend on many factors: free stream aerodynamic characteristics, aircraft release parameters such as release speed, altitude, ejection velocity, aircraft flow field disturbance parameters, and atmospheric conditions. In the upgraded F111C aircraft the bombing solutions computed by the ballistic computer use a simple three degree of freedom point mass representation of the store. In this point mass representation, the store's aerodynamic characteristics are usually represented by fitted curves of the drag coefficient as a function of Mach number over the complete flight regune of the store. There are some shortcomings in the quality of data that RAAF has provided as part of their AUP commitments. For instance, the aerodynamic characteristics for the Mk 82 bomb have been derived by scaling Mk 83 bomb data, thereby introducing errors of scale. Further, the origm of the original database corresponding to the Mk 83 GPLD bomb is not known. This scaling approach is not necessarily valid for a RAAF weapon. Hence there is a need to establish a better quality database for Mk 82 GPLD bomb.
This report discusses in detail the aerodynamic database of Mk 82 GPLD stores as obtained from several sources: wind tunnel tests conducted by Air Operations
Division (AOD) on scaled models (full scale, 1/6 scale) in both Melbourne and Salisbury facilities, aeroballistic range trials conducted by the Weapons Systems
Division (WSD) using well tested photogrammetric techniques, and full scale bomb drop trials conduced by Aircraft Research and Development (ARDU) from F/A-18 aircraft in the Woomera instrumented Range facility.
It is hoped that this recommended database for Mk 82 GPLD stores will be used in the mission computer software of the post AUP F-111C aircraft, and that the new data will provide improved accuracy with the Mk 82 bomb releases. Further, this report will provide valuable data for exchanges with US and other TTCP countries. |
| Appears in Collections: | DSTO Formal Reports
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