Sukhoi-Gulfstream S-21

S-21
S-21
	Sukhoi SSBJ project model
General information
Type	Supersonic business jet
Manufacturer	Sukhoi Design Bureau/Gulfstream Aerospace

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.^[1]

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.^[2]

Specifications (S-21)

General characteristics

Crew: 2
Capacity: 6–10 passengers and 2,999 lb (907 kg) useful load
Length: 124 ft 2 in (37.86 m)
Wingspan: 65 ft 5 in (19.93 m)
Wingsweep: 32° unswept 68° swept
Height: 27 ft 1 in (8.26 m)
Empty weight: 54,167 lb (24,570 kg)
Max takeoff weight: 114,200 lb (51,800 kg)
- With Fuel: 58,465 lb (26,519 kg)
Powerplant: 3 × Aviadvigatel D-21A1 turbofan, 16,535 lbf (73.55 kN) thrust each