▁re usable ▁two - stage - to - or bit ▁ro cket ▁concept ▁proposed ▁in ▁the ▁book ▁The ▁Ro cket ▁Company ▁by ▁Patrick ▁J . ▁G . ▁St ien non , ▁David ▁M . ▁Ho err , ▁Doug ▁B irk hol z ▁( AI AA , ▁ 2 0 0 5 ). ▁The ▁concept ▁is ▁described ▁in ▁the ▁exp ired ▁US ▁pat ent ▁ 5 5 6 8 9 0 1 . ▁The ▁D H - 1 ▁was ▁never ▁built , ▁and ▁its ▁manufact uring ▁company , ▁AM & M , ▁is ▁also ▁fict ional . ▁ ▁The ▁book ▁highlight ed ▁and ▁sought ▁to ▁solve ▁many ▁problems ▁of ▁building ▁a ▁Che ap ▁Access ▁To ▁Space ▁vehicle ▁via ▁the ▁D H - 1 ▁design . ▁ ▁" The ▁Ro cket ▁Company " ▁is ▁a ▁work ▁of ▁fiction , ▁but ▁the ▁science , ▁engineering ▁and ▁politics ▁that ▁under lies ▁the ▁design ▁of ▁the ▁D H - 1 ▁are ▁described ▁as ▁highly - fe as ible . ▁ ▁The ▁design ▁is ▁notable ▁in ▁that ▁it ▁attempts ▁to ▁avoid ▁new ▁or ▁none x istent ▁wonder ▁techn ologies , ▁to ▁rely ▁on ▁human ▁rather ▁than ▁computer ▁control , ▁to ▁consider ▁the ▁possible ▁econom ics ▁of ▁a ▁very ▁small ▁ ▁payload ▁capacity ▁( including ▁pilot ), ▁to ▁make ▁use ▁of ▁a ▁' pop ▁up ▁first ▁stage ' ▁launch ▁profile , ▁to ▁market ▁the ▁vehicle ▁for ▁' space ▁access ' ▁rather ▁than ▁' c argo ▁delivery ', ▁and ▁to ▁offer ▁a ▁business ▁plan ▁whose ▁intention ▁is ▁to ▁sell ▁the ▁D