Projects

Boeing-Sikorsky SB>1 DEFIANT

SB>1 DEFIANT is a modern, fully-integrated vertical lift aircraft being developed by Boeing and Sikorsky for the US Army’s joint multi-role (JMR) technology demonstration of the Future Vertical Lift (FVL) programme.

Manufacturers
Boeing and Sikorsky
Crew
Four
Troops
12
True Airspeed
250ktas (463km/h)
Rotor
X2 rigid co-axial rotor system
Fuselage
Composite fuselage

SB>1 DEFIANT is a modern, fully-integrated vertical lift aircraft being developed by Boeing and Sikorsky for the US Army’s joint multi-role (JMR) technology demonstration of the Future Vertical Lift (FVL) programme.

The aircraft will meet the attack and assault needs of the US Army, along with the long-range transportation, infiltration and resupply needs of the US Marine Corps.

SB>1 DEFIANT will be capable of performing tight assault formations, close proximity landing, unique hovering, high-speed and low-speed flights due to its large angular rates and precision attitude control capabilities.

SB>1 DEFIANT design and features

The next-generation aircraft will meet the future demands of the military, offering an optimal combination of speed, lift and range, with better agility and greater manoeuvrability. It will be built with 85% commonality between attack and assault aircraft.

The fuselage of Defiant will be made of composite materials for achieving superior strength and weight reductions. It will integrate a retractable type landing gear for less drag during flight.

SB>1 DEFIANT will be equipped with X2 rigid co-axial rotor system technology, which was tested aboard the X2 and S-97 Raider aircraft. Each rotor of the twin co-axial rotor system will revolve in opposite direction and will reduce the net torque of the other rotor in real-time.

“SB>1 DEFIANT will be equipped with X2 rigid co-axial rotor system technology.”

Its rotor blades will be made from composite material, which will reduce vibrations and minimise wear of the components, while providing greater life and reduced maintenance costs. The aircraft will also be equipped with the active vibrator control technology to dampen the vibrations from the rotors and deliver smooth lift and manoeuvrability.

The rear fuselage will integrate a pusher propulsor with the clutch, enabling the aircraft to attain approximately twice the speed of a conventional rotorcraft. The pusher configuration will also allow the aircraft to cover longer distances during the long-range missions, while advanced drive system will ensure minimal transmission losses.

The manually foldable blades will reduce the space requirements during parking, picketing, and transport. The aircraft will fit in the footprint of a folded AH-1 when folded for shipboard stowage.

Avionics

SB>1 DEFIANT will feature a rotorcraft equipped with a fly-by-wire system, which can control the rotors, pusher propulsor, rudders, and elevators. Each rotor blade actuator will be connected to the fly-by-wire technology to avoid any potential mechanical losses.

The active rudder and elevator controls can change the flight path of the aircraft with greater agility and ease. The aircraft will also have options to employ weapons during all modes of flight.

Cabin details of SB>1 DEFIANT

SB>1 DEFIANT can accommodate 12 fully combat-equipped troops and four crew members. It will also offer sufficient space for medical evacuation (MEDIVAC) operations.

SB>1 DEFIANT performance

The aircraft will be capable of flying at a maximum speed of 250ktas (463km/h) and hover out of ground effect (HOGE) at an altitude of 6,000ft.

It will have greater expeditionary range and endurance and will have the capability to carry heavier payloads compared to the present generation rotorcraft.

The forward thrust offered by the pusher propulsor will enable the aircraft to rapidly displace itself from the flight path in high-threat environments.

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