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Crater Experiment

Crater Experiment. John Polansky. Presentation Outline. Purpose Experimental Setup and materials Dry sample tests and crater data Wet sample tests and crater data LP-1 Model test and crater data Lessons Learned Conclusions Special Thanks. Purpose.

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Crater Experiment

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  1. Crater Experiment John Polansky

  2. Presentation Outline • Purpose • Experimental Setup and materials • Dry sample tests and crater data • Wet sample tests and crater data • LP-1 Model test and crater data • Lessons Learned • Conclusions • Special Thanks John Polansky

  3. Purpose • Determine crater specifics for different material properties: • Dry masonry Sand • Compact • Loose • Wet Masonry Sand • Compact • Loose John Polansky

  4. Test Samples Dry/Wet Lead Ball Compact/Loose LP-1 Model Compact Wet John Polansky

  5. Projectiles • Lead Balls • 0.490inch diameter • 0.018 inch patch • LP-1 Model • 7/16 inch bolt shank • Hollow base 0.08 inch wall thickness • 1.1 inch nose, 2.2 inch body • 2 plastic sabot cups John Polansky

  6. Experimental Setup Cardboard barrier John Polansky

  7. Dry Loose Lead Ball John Polansky

  8. Dry Lead Ball Dry Loose Dry Compact John Polansky

  9. Dry Lead Ball Dry Loose Dry Compact John Polansky

  10. Lead Ball Deformation Dry Loose Dry Compact John Polansky

  11. Crater and Sample Data * Measured using 11kg mass and a 1 inch diameter dowel John Polansky

  12. Wet Compact Lead Ball John Polansky

  13. Wet Lead Ball Wet Loose Wet Compact John Polansky

  14. Wet Lead Ball Wet Loose Wet Compact John Polansky

  15. Lead Ball Deformation Wet Loose Wet Compact John Polansky

  16. Crater and Sample Data * Measured using 21kg mass and a 1 inch diameter dowel John Polansky

  17. Wet Compact LP-1 Model John Polansky

  18. LP-1 Model Impact John Polansky

  19. LP-1 Model Deformation John Polansky

  20. Crater and Sample Data * Measured using 21kg mass and a 1 inch diameter dowel John Polansky

  21. Lunar Crater Equation • The following published equation was developed to determine crater diameter, John Polansky

  22. Results John Polansky

  23. Lessons Learned John Polansky

  24. Conclusions • More testing is required, specifically with penetrator type projectiles • The theoretical solution is not an accurate representation of the results • The use of a different launcher would aid in mitigating the effects of muzzle blast (rail gun) • The use of a ‘protected’ chronograph could provide accurate velocity values John Polansky

  25. Special Thanks • George and Peter Wartner • Wartner Gun Works • Faas Construction John Polansky

  26. Questions?

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