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在1990年中期，英國的研究將早期的HOTOL設計演變為前景更為廣闊的Skylon設計，該設計仍在開發中。 從商業角度來說，Rocketplane Kistler和Rotary Rocket試圖在破產之前製造可重複使用的私人開發火箭。 美國宇航局提出了危險的可重用概念，以取代航天飛機技術，這將在X-33和X-34計劃中得到證
of Rocket Systems" （页面存档备份，存于互联网档案馆） 參考文獻 (Fixed), "CRV7 Rocket System: Fixed Wing", Bristol Aerospace, 2002年9月 (Rotary), "CRV7 Rocket System: Rotary Wing"
The project has not been continued since.[來源請求] From 1999 to 2001 Rotary Rocket attempted to build a SSTO vehicle called the Roton. It received a large
Bell 205 (UH-1) – Bell UH-1Y Viper Upgrade (United States), Aircraft – Rotary-wing – Military. 2008 [2009-06-05]. （原始内容存档于2013-01-26）. Frawley, Gerard:
development of the competing government-financed EELV program. In 1998, Rotary Rocket proposed the Roton, a Single Stage to Orbit (SSTO) piloted Vertical