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Stephan Shurn 16 January 2008 Propulsion Rail Guns and Conventional Guns

This study explores the propulsion technologies of rail guns and conventional guns, analyzing factors such as cost, acceleration, and heat loading. The feasibility of rail guns and potential future developments are also discussed.

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Stephan Shurn 16 January 2008 Propulsion Rail Guns and Conventional Guns

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  1. Stephan Shurn16 January 2008PropulsionRail Guns and Conventional Guns AAE 450 Spring 2008

  2. Rail Guns • Low cost per launch • High G’s at small scale ~10,200 g’s at 180m • Slightly lower g’s at large scale ~928 g’s at 2 km • 2nd Stage needed • High energy input ~1.5-20 GJ • High heat loading on nose and body ~3000K • Technology Development AAE 450 Spring 2008 Propulsion

  3. Conventional Guns • HARP – 1960’s • Low Cost • High G-loading (~20,000 g’s) • 2nd or 3rd stages Future Work • Rail gun feasibility study AAE 450 Spring 2008 Propulsion

  4. Backup AAE 450 Spring 2008 Propulsion

  5. Electricity Cost Calculation -Power =~ $75.00/ MWhr, 1 KWhr = 3.6MJ • For a 3 GJ Railgun 3000MJ*(1KWhr/3.6MJ) *(1MWhr/1000KWhr) = 0.833 MWhr 0.833 MWhr * $75.00/MWhr = $62.50 in power AAE 450 Spring 2008 Propulsion

  6. Railgun Scaling • Ve ~ 6000 m/s L = 180 m t = 0.06s • Acceleration = (6,000m/s)/(0.06s) = 100,000 m/s2 • (100,000m/s2)/(9.81m/s2) = 10,204 g’s • If L = 2000m, Ve = 6000 m/s, using same model: • t = (2000m)/(6000m/s – 0m/s) = 0.66 s • Acceleration = (6000m/s)/(0.66s) = 9,090.9 m/s2 • (9,090.9m/s2)/(9.81m/s2) = 926 g’s AAE 450 Spring 2008 Propulsion

  7. Sources • “Electromagnetic Railgun Technology for the Development of Small Sub-/Orbital Payloads,” Executive Summary, CCN No. 01 to ESA Contract No. 13420, Sep. 2003. • McNab, Ian R., “Launch to Space With an Electromagnetic Railgun,“ IEEE Transactions on Magnetics, Vol. 39, No. 1, January 2003, pp. 295-304. • McNab, Ian R., Candler, G.V., and Barbee, C.S., “Projectile Nosetip Thermal Management for Railgun Launch to Space,“ IEEE Transactions on Magnetics, Vol. 43, No. 1, January 2007, pp. 491-495. • Wade, Mark, “Martlet 4,” [http://www.astronautix.com/lvs/martlet4.htm.  Accessed 1/12/08.] AAE 450 Spring 2008 Propulsion

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