![Sukhoi-Gulfstream S-21 Sukhoi-Gulfstream S-21](https://upload.wikimedia.org/wikipedia/commons/thumb/9/95/Sukhoi_SSBJ_project_model.jpg/400px-Sukhoi_SSBJ_project_model.jpg)
Sukhoi-Gulfstream S-21 was a projected Russian-American supersonic business jet.
In the early 1990s, Gulfstream Aerospace and the Sukhoi Design Bureau began a joint effort to develop a supersonic small business jet, code named the S-21. Due to questionable market demand for commercial supersonic air travel, commitment to the project weakened and delays mounted.
Gulfstream eventually dissolved the partnership, although Sukhoi continued work on the S-21.
The S-21 would be capable of sustained cruise at Mach 2+ and much research and development has gone into the management of the troublesome transonic effects phenomena associated with near Mach 1 air speeds.
As of 2012, the project had not received any funding for the 2013-2025 development period and appeared to be cancelled.
General characteristics
Performance
Aircraft of comparable role, configuration, and era
Related lists
Media related to Sukhoi S-21 at Wikimedia Commons
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