Sukhoi S-51


Donald McKelvy
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14 August 2009
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Sukhoi S-51

Type: Mid-size long-range supersonic transport.

Projected date of prototype completion was 2005 with service entry in 2010.

Design features: Rear-mounted sweptback low wings, with very long curved root extensions, carrying engine ducts on wide rearward extension of inboard semi-span; sweptback foreplanes; small diameter, long fuselage, with flush windscreen in conical nose; swept vertical tail services. Intended to fly non-stop from Moscow to any airport in Europe or Asian continent, or one stop to any world capital; range similar when flying supersonic or high subsonic, permitting operation over highly populated areas.

Power plant: Four R-51 turbojets; each rated at 93.17 kN (20,945 lb st)

Accommodation: Crew of two; from 50 to 68 passengers.

Systems: Based on experience with Sukhoi S-21 aircraft.

Dimensions external
Wing span: 28.30 m (92 ft 10.25 in)
Length overall: 50.50 m (165 ft 8.25 in)

Dimensions internal
Passenger cabin length: 14.80 m (46 ft 6.5 in )
Passenger cabin max width: 2.64 m (8 ft 8 in)
Passenger cabin max height: 1.95 m (6 ft 4.5 in)
Passenger cabin volume: 62.40 cu m (2,204 cu ft)

Wings, gross: 300.00 sq m (3,230 sq ft)

Weights and loadings
Operating weight empty: 39.036 kg (86,060 lb)
Max payload: 6,200 kg (13,670 lb)
Max fuel: 47,160 kg (103,970 lb)
Max T-O weight: 90,700 kg (199,955 lb)
Max wing loading: 302.33 kg/sq m (61.9 lb/sq ft)
Max power loading: 243.4 kg/kN (2.39 lb/lb st)

Performance (estimated)
Max supersonic speed: Mach 2.0 (1,145 kts; 2,125 km/h; 1,320 mph)
Max subsonic speed: Mach 0.95 (547 kts; 1,015 km/h; 630 mph)
Service ceiling: 17,000-19,000 m (55,775-62,335 ft)
Balanced runway length: 2,500 m (8,200 ft)
Max range at Mach 1.4 and reduced fuel: 2,930 n miles (5,430 km; 3,375 miles)
Max range at Mach 2.0 or 0.95 with max fuel: 4,965 n miles (9,200 km;5,715 miles)

Operational noise levels: Designed to meet FAR Pt 36 standards with sonic boom intensity less than 5 kg/sq m (71 lb/sq in)

Source: Jackson, Paul editor. Jane's All the World's Aircraft 1995-96 Jane's Information Group Limited 1995 pp. 381-382.

Three view drawing of the Sukhoi S-51.

Image source:


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may be early drawing to Sukhoi S-51 and a Model for it.

Jane's All the World's Aircraft 1991-1992


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From Krila 4/1989.


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Overall planform looks a lot like the Gulfstream-Sukhoi SSBJ, just this one is bigger.

Sukhoi S-51 sales leaflet ...
only 64 pax in economy configuration? edit: and 12+40 in 2-class, looks like ~20 in first class (or 14+6 helpers?)

Gotta admit that I do like the all first-class layout. Looks more like a nice train lounge car or business jet than a commercial airliner.
Artist's impression and line drawings of Sukhoi S-51 design variants.


Third 3-view is late 90s TsAGI-Sukhoi MSDS study, not S-51. Apparently based on one of S-21 iterations.


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