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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 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 John Polansky
Purpose • Determine crater specifics for different material properties: • Dry masonry Sand • Compact • Loose • Wet Masonry Sand • Compact • Loose John Polansky
Test Samples Dry/Wet Lead Ball Compact/Loose LP-1 Model Compact Wet John Polansky
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
Experimental Setup Cardboard barrier John Polansky
Dry Loose Lead Ball John Polansky
Dry Lead Ball Dry Loose Dry Compact John Polansky
Dry Lead Ball Dry Loose Dry Compact John Polansky
Lead Ball Deformation Dry Loose Dry Compact John Polansky
Crater and Sample Data * Measured using 11kg mass and a 1 inch diameter dowel John Polansky
Wet Compact Lead Ball John Polansky
Wet Lead Ball Wet Loose Wet Compact John Polansky
Wet Lead Ball Wet Loose Wet Compact John Polansky
Lead Ball Deformation Wet Loose Wet Compact John Polansky
Crater and Sample Data * Measured using 21kg mass and a 1 inch diameter dowel John Polansky
Wet Compact LP-1 Model John Polansky
LP-1 Model Impact John Polansky
LP-1 Model Deformation John Polansky
Crater and Sample Data * Measured using 21kg mass and a 1 inch diameter dowel John Polansky
Lunar Crater Equation • The following published equation was developed to determine crater diameter, John Polansky
Results John Polansky
Lessons Learned John Polansky
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
Special Thanks • George and Peter Wartner • Wartner Gun Works • Faas Construction John Polansky