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Second Stage

Assembly

Upper stage with one vacuum-optimised engine and a common-bulkhead tank; it performs the long burn from ~2 km/s staging velocity to orbital insertion.

Direct parts	4
Class	Assembly

Upper stage with one vacuum-optimised engine and a common-bulkhead tank; it performs the long burn from ~2 km/s staging velocity to orbital insertion. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Bill of materials for Second Stage

4 top-level lines as of r117566

#	Item / sub-assembly	Part no.	Qty/assy	Ext. qty	Type
1	Vacuum Engine 7 parts	orbital-launch-vehicle-vacuum-engine	1×	1	assembly
2	Second-Stage Tank 5 parts	orbital-launch-vehicle-upper-tank	1×	1	assembly
3	Propellant Feed System 6 parts	orbital-launch-vehicle-feed-system	1×	1	assembly
4	Reaction Control System 3 parts	orbital-launch-vehicle-rcs	1×	1	assembly