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And gives lower start pressure
Rough Costs – 5 MTWho Shell Propellant Barrels Deprec. Total
Gun – MK7+ 17.5bn 75.8bn 1.3bn 0.05bn 95bn
Gun - Gas 3.5bn 3.8bn 0.7bn 0.05bn 7.4bn
Planes - Old 13bn
Airship - New 5-10bn
Gun - Carbon Life dependant
NB McClellan et al analysis awaiting clarification!!
Conclusion: Guns cheaper for fast injection
Railgun – high wear