Rolls-Royce F-35B LiftSystem: 29,000 BHP LiftFan and the Engineering Behind Stealth STOVL — Full Analysis 2026
The Rolls-Royce LiftSystem is the propulsion subsystem that gives the Lockheed Martin F-35B its Short Take-Off and Vertical Landing (STOVL) capability. It consists of two main components — the LiftFan and the 3-Bearing Swivel Module (3BSM) — both designed and produced by Rolls-Royce. The F-35B is the world’s only in-service fifth-generation STOVL combat aircraft.
Technical Specifications
| Component / Parameter | Value |
|---|---|
| LiftFan Input Power | 29,000 BHP (21,600 kW) from driveshaft |
| LiftFan Lift Force | ~20,000 lbf cold airstream |
| 3BSM (swivel exhaust) Thrust | ~18,000 lbf directed exhaust |
| Total Hover Lift | ~40,000 lbf combined |
| Min STOVL Takeoff Run | ~152 m (hot day / max load) |
| Host Engine | Pratt & Whitney F135 (26,000–43,000 lbf range) |
| Production | Rolls-Royce Indianapolis (LiftFan) |
How It Works
During STOVL operations, the F135 main engine sends ~29,000 BHP through a driveshaft to the LiftFan — a large counter-rotating fan mounted just aft of the cockpit, producing a column of cold air downward. Simultaneously, the 3BSM rotates the engine’s nozzle from horizontal (forward flight) to vertical (hover), providing hot exhaust thrust downward. Roll nozzles under each wing provide lateral stability during hover and low-speed transition.
The cold LiftFan airstream is the key innovation over Harrier-style VTOL: it eliminates hot-gas deck erosion on ship surfaces and prevents exhaust gas ingestion into the engine — two major limitations of first-generation VTOL jets.
Operators
- USMC: 350+ F-35B on order; deployed from amphibious assault ships (America, Wasp classes)
- RAF / Royal Navy: ~135 F-35B; HMS Queen Elizabeth, Prince of Wales carriers
- Italy: ~30 F-35B; ITS Cavour carrier
- Japan: 40+ F-35B; converted JS Izumo and Kaga
- Spain: Evaluation for Juan Carlos I
Turkey Context
Turkey was removed from the F-35 programme in 2019 following the S-400 procurement. TCG Anadolu (F-511) was designed to operate F-35B aircraft but now cannot. Turkey developed the Bayraktar TB3 folding-wing UCAV as an alternative platform for TCG Anadolu’s short deck — a practical workaround, but not an equivalent STOVL combat aircraft capability.
