As currently proposed, the SSJ 100 family will comprise two different sizes of aircraft offered with two performance options - "basic" and "LR" (long range).

The 95- to 98-seat SSJ 100-95 is the lead variant in the development programme, and this is the size expected to prevail, so will be the major production version, says SCAC president Victor Subbotin.

The basic 95-seater is offered with a maximum take-off weight (MTOW) of 42,500kg (93,600lb) and an engine thrust of 15,650lb (70kN), offering a range with 98 passengers of 2,950km (1,600nm). The LR version has the same engine thrust, but a 3,400kg increase in MTOW, boosting range to 4,420km.

Although the 75- to 78-seat SSJ 100-75 is on the agenda, Subbotin says the only commitments for this variant are "soft" orders. "We plan to build the 75-seater once the 95-seater is finalised."

The SSJ 100-75 is 3.5m (11.5ft) shorter than the baseline 95-seater, but incorporates an identical wing, while the MTOW on the basic version is reduced to 38,800kg and engine thrust is derated by around 10%. The LR model has the same thrust rating as the 95-seater, and MTOW increased to 42,300kg.

"For the flight-test programme we will build one SSJ 100-75 and one SSJ 100-75LR, but the flight-test effort will be reduced as it can be validated from the 95-seater test programme," says Subbotin.

Further down the road, SCAC is considering the development of a stretched 110-seat version, but a final decision on such a move "will depend on the market" says Subbotin. "The engine and airframe is capable of being stretched to 110-120 seats - the latter would offer lower range and incorporate a high-density seating arrangement with reduced pitch."

SSJ 100-110 studies envisage an aircraft with the strengthened structure and higher weights of the SSJ 100-95LR stretched by around 3m with 1.5m plugs either side of wing. "If we started development now it could be in service in 2010, but 2012 is a more realistic target," says Subbotin.

Superjet 100 family specification SSJ100-75 SSJ100-75LR SSJ100-95 SSJ100-95LR SSJ100-110*
Length (m) 26.3 26.3 29.8 29.8 32.8
Wingspan (m) 27.8 27.8 27.8 27.8 27.8
Wing area (m2) 10.3 10.3 10.3 10.3 10.3
Height (m) 33.7 33.7 33.7 33.7 33.7
Internal cabin width (m) 3.24 3.24 3.24 3.24 3.24
Maximum take-off weight (kg) 38,800 42,300 42,500 45,900 45,900
Maximum landing weight (kg) 35,000 35,000 39,400 39,400 39,400
Maximum payload (kg) 9,130 9,130 12,250 12,250 n/a
Engine take-off thrust (lb) 13,750 15,650 15,650 15,650 15,650
Long range cruise speed (Mach) 0.78 0.78 0.78 0.78 0.78
Required runway length (MTOW/ISA/SL) 1,520 1,520 1,530 1,530 n/a
Accommodation (one-class 32in pitch) 78 78 98 98 110
Design range (km) at MTOW/full pax 2,900 4,550 2,950 4,420 n/a
Notes: *proposed variant - data provisional Source: Sukhoi Civil Aircraft

Source: Flight International