Aerodynamic Characteristic of the A3 DRDC-ISL Reference Projectile: Missile with Lattice Fins
Bibliographic record
Abstract
Free-flight tests were conducted in the Defence R&D Canada (DRDC) Valcartier aeroballistic range and at the ISL open range test site, and wind tunnel experiments in the DRDC Valcartier Indraft Trisonic, and the French-German Research Institute wind tunnels, as well as numerical computations on the A3 DRDC-ISL reference projectile at subsonic and supersonic velocities. The projectile consisted of an ogive-cylinder body with a length-to-diameter ratio of 10 with four lattice control surfaces. The reference grid fin consisted of nine thick cells in a vertical orientation and located at 0.7 cal from the base. The wind tunnel tests were conducted for various fin deflection angles at a range of angles of attack and roll orientations to determine the static aerodynamic coefficients. Very thin walls, an open base concept as well as a cruciform cell orientation, were also investigated in the wind tunnels. Flow visualizations were obtained from wind tunnel as well as free-flight tests. The wind tunnel tests were conducted in the Mach number range of 0.6 to 4.0, while the free-flight tests were conducted in the Mach number range of 1.4 to 3.3. The stability derivatives and static aerodynamic coefficients were very well determined. Numerical investigations were carried out on the reference configuration to visualize the flow features and obtain predictions of the aerodynamic coefficients. The aerodynamic coefficients and stability derivatives are presented individually and then compared where warranted. Finally, the results are compared with a classical fin design.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".