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Minimum Orbital Vehicle
BD-5J masses 161 kg empty 299 kg filled is 4.2 m long and has a fuselage 1.3 m in diameter. Adding a stage that adds 3.2 km per sec with an exhaust speed of 4.5 km per sec requires a propellant fraction of 50.9% and with a 4..35% structure fraction requires 309 kg propellant. And a stage weight of 668 kg. With two strap on boosters each 746 kg in weight adding another 3.2 km per second. Four more similar elements complete the requirements for orbit.
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