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((More citations needed|date=January 2017))
{|((Infobox aircraft begin
  |name =  S-21
  |image = Sukhoi SSBJ project model.jpg
  |caption =Sukhoi SSBJ project model
  |designer =
))((Infobox aircraft type
  |type = [[Supersonic business jet]]
  |manufacturer = [[Sukhoi Design Bureau]]/[[Gulfstream Aerospace]]
  |first flight = <!--if it hasn't happened, leave it out!-->
  |introduction = <!--date the aircraft entered or will enter military or revenue service-->
  |retired = <!--date the aircraft left military or revenue service. If vague or multiples, it probably should be skipped-->
  |status = <!--in most cases, this field is redundant; use it sparingly-->
  |primary user = <!--please list only one user – for military aircraft, the user is a nation or a service arm. Do NOT add those tiny flags as they limit horizontal space.-->
  |more users = <!--limited to three "more users" total; please separate with <br/>-->
  |produced = <!--years in production, e.g. 1970-1999, if still in active use but no longer built-->
  |number built = 
  |program cost= <!-- total program cost. -->
  |unit cost = <!-- incremental or flyaway cost for military aircraft or retail price for commercial aircraft. -->
  |developed from = <!-- the aircraft which formed the basis for the topic type -->
  |variants with their own articles = <!-- variants OF the topic type -->
))
|}
[[File:Sukhoi Gulfstream S-21.jpg|thumb|right|300px|S-21 3D model]]

'''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.<ref>((cite web |url=http://www.popularmechanics.com/flight/g2302/11-outlandish-attempts-to-build-the-next-concorde/ |work=Popular Mechanics |accessdate=November 17, 2016 |date=November 24, 2015 |first=Chris |last=Clarke |title=11 Outlandish Attempts To Build The Next Concorde))</ref>

Gulfstream eventually dissolved the partnership, although Sukhoi continued work on the S-21.

The S-21 would be capable of sustained cruise at [[Mach number|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.<ref>((cite web|url=http://www.minpromtorg.gov.ru/reposit/minprom/ministry/fcp/avia2013-2025/GP_aviatciya.pdf|title=Государственная программа Российской Федерации "Развитие авиационной промышленности на 2013 - 2025 годы"|publisher=[[Минпромторг России]]|access-date=2013-03-30|archive-url=https://www.webcitation.org/6Ftb1D23K?url=http://www.minpromtorg.gov.ru/reposit/minprom/ministry/fcp/avia2013-2025/GP_aviatciya.pdf|archive-date=2013-04-15|url-status=dead))</ref>

==Specifications (S-21)==
((Aircraft specs
|prime units?=imp
|ref=
|crew=2
|capacity=6–10 passengers and 2,999 lb (907 kg) useful load
|length ft=124.2 
|length m=37.86 
|span ft= 65.4 
|span m=19.93
|span note=<br>
* '''Wingsweep:''' 32° unswept 68° swept
|height ft= 27.1 
|height m=8.26 
|empty weight lb=54,167 
|empty weight kg=24,570 
|max takeoff weight lb=114,200 
|max takeoff weight kg=51,800
|max takeoff weight note=<br>
** '''With Fuel:''' 58,465 lb (26,519 kg)
|eng1 name= [[Aviadvigatel]] D-21A1
|eng1 type=turbofan
|eng1 number=3
|eng1 lbf=16,535
|eng1 kn=73.55 
|max speed mach= 2+
|max speed kmh= 
|cruise speed mph= 
|cruise speed kmh= 
|range miles=4,600 
|range km=7,403
|range note=at Mach 0.95<br>
* '''Range:''' 2,715 mi (4,369 km, 2360 nmi) at Mach 1.4
|ceiling ft=63,900 
|ceiling m=19,477 
|thrust/weight=0.43
))

==See also==
((aircontent
|related=
|similar aircraft=
* [[Aerion SBJ]]
* [[SAI Quiet Supersonic Transport|QSST]]
* [[Quiet Spike]]
* [[Tupolev Tu-444]]
|lists=
* [[List of civil aircraft]]
|see also=
* [[Business jet]]
* [[Hypersonic speed|Hypersonic transport]]
* [[Supersonic business jet]]
* [[Supersonic transport]]
))

==References==
((Reflist))

==External links==
((Commons category-inline|Sukhoi S-21))

((Sukhoi aircraft))
((Supersonic transport))

[[Category:Abandoned civil aircraft projects]]
[[Category:2000s Russian business aircraft]]
[[Category:Sukhoi aircraft|S-21]]
[[Category:Supersonic business jets]]
[[Category:Trijets]]
[[Category:2000s United States business aircraft]]

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