/sci/ - Science & Math

In flight, the Vulcan lifts off like a conventional system, but after releasing its payload, the first-stage booster engine assembly detaches and re-enters atmosphere using an inflatable heat shield. After parachute deployment, the booster engine assembly is hooked and captured by a Chinook helicopter. The assembly is then recertified and reattached to a new Vulcan first stage. ULA says that this results in a 90 percent savings in propulsion costs because the engine assembly makes up 25 percent of the booster weight and 65 percent of the booster cost.