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Stephan Shurn 31 January 2008 Propulsion Rail Gun Feasability

This study explores the feasibility of using rail guns to propel high-speed projectiles by examining multiple variables such as barrel length, rail distance, and muzzle velocity. It considers factors such as high electricity and start-up costs, the need for extra rocket boost, and the potential for high g-loads. Future work includes group code testing and collaboration with group members on other parameters.

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Stephan Shurn 31 January 2008 Propulsion Rail Gun Feasability

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  1. Stephan Shurn31 January 2008PropulsionRail Gun Feasability AAE 450 Spring 2008

  2. Rail Guns • Multiple variables – barrel length, Rail distance, muzzle velocity • Assuming no drag or friction losses, 100kg projectile • High electricity cost, high energy inputs • High start-up and development costs • Needed extra rocket boost, esp. with low muzzle velocity • High g-loads AAE 450 Spring 2008 Propulsion

  3. Electricity Cost Calculation Future Work • Group code testing • Work with group members on other parameters AAE 450 Spring 2008 Propulsion

  4. Backup AAE 450 Spring 2008 Propulsion

  5. Electricity Cost Calculation AAE 450 Spring 2008 Propulsion

  6. Calculation Assumptions • Elec. Run for 1 hr. • No Drag or friction losses within rail gun • Price of elec. - $0.0556 / kW*hr (New Mexico Industrial average for 2007) • 100 kg projectile mass • Electromagnetic Field of 10 Tesla AAE 450 Spring 2008

  7. Calculations • Current Needed I = (v2*m)/(2*D*L*B) • Voltage V = v*B*L • Wattage Watts = V*I • Cost Cost = ($0.0556/kW*hr)*(Watts)*(1 hr) • Acceleration A = F/(m*9.80665) AAE 450 Spring 2008

  8. Definition of Variables V = Voltage (Volts) I = Current (amperes) v = Muzzle Velocity (m/s) m = projectile mass (kg) D = Length of Rails (m) L = Distance between rails (m) B = Magnetic Field Strength (Teslas) a = Acceleration (m/s2) AAE 450 Spring 2008

  9. Sources • Energy Information Administraion, “Average Retail Price of Electricity to Ultimate Customers by End-Use Sector, by State”, December 13, 2007, [http://www.eia.doe.gov/cneaf/electricity/epm/table5_6_b.html Accessed 29 January 20008.] • “Jengel and Fatro’s Rail Gun Page,” April 24, 2002, [http://home.insightbb.com/~jmengel4/rail/rail-intro.html Accessed 22 January 2008] • Yavuzkurt, Savas, “Thermal Sensor Design for Electromagnetic Gun Rails,” [http://www.mne.psu.edu/me415/spring07/BAE2/ Accessed 23 January 2008] AAE 450 Spring 2008 Propulsion

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