Rocket Engine

It signals a long-range objective whose supporting materials should be nested; do not confuse engine stock with rocket completion.

When it fits: Add it when a named rocket or project requires the engine.

The tradeoff: One source recipe run makes 1 and lists 5 Rocket Fuel, 3 Pump, 2 Nozzle, 1 Turbine plus 1 other input(s) at Facturer; 1 recipe variant(s) for this output are grouped together. Verify access where the pack is incomplete. It is one component in a larger chain; fuel, payload, facility access and delivery are separate.