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After reading about the end of of Project HARP - it seems like they intended to use the gun to fire a rocket, and after a certain altitude the engine would igni

• nickff 11y ago
  Yes, and in the years since HARP, there have been a few rocket-assisted projectiles developed (though none which have been intended for space launch).[1] I should also mention that unless the projectile was fired at or above escape velocity (intended to leave the Earth's gravity well), it would require some onboard propulsion to 'circularize' its orbit (and avoid crashing back into the Earth on its first time around). [1] https://en.wikipedia.org/wiki/Rocket-assisted_projectile https://en.wikipedia.org/wiki/Rocket-assisted_projectile