FJ33
Type	Turbofan
National origin	United States
Manufacturer	Williams International
First run	1998 [1]
Major applications	Cirrus Vision SF50 Diamond D-Jet
Developed from	Williams FJ44

The Williams FJ33 is an American family of turbofan jet engines intended for use in very light jet aircraft. The FJ33 is a scaled-down version of the FJ44 engine. The FJ33-5A is the latest version certified in June 2016.^[2]

Design

Engine configuration is a single stage fan, with booster stage, driven by a two-stage LP turbine, supercharging a centrifugal HP compressor, driven by a single stage HP turbine.^[3] An annular combustor is featured.

The FJ33 has a dry weight of less than 300 lb (140 kg), overall diameter of 18.36 in (466 mm), 38.43 in (976 mm) overall length, and produces between 1,000 lbf (4,400 N) and 1,800 lbf (8,000 N) static thrust. Specific fuel consumption at 1,200 lbf (5,300 N) thrust (SLS, ISA) is understood to be 0.486 lb/(lbf⋅h) (13.8 g/(kN⋅s)).

Variants

• FJ33-1
• FJ33-2
• FJ33-3
• FJ33-4-A11
• FJ33-4
• FJ33-4-17M
• FJ33-4-18M
• FJ33-4A-19
• FJ33-5A
• Jahesh-700

Iranian Reverse engineered variant serving as high endurance UAV powerplant.^[4][5]

Applications

• Adam A700
• ATG Javelin
• Cirrus Vision SF50
• Diamond D-Jet
• Epic Elite
• Flaris LAR01
• Spectrum S-33 Independence
• Sport Jet II
• Eclipse 700

Specifications (FJ33-5A)

General characteristics

• Type: turbofan
• Length: 38.43 in (976 mm)
• Diameter: 18.36 in (466 mm),
• Dry weight: less than 300 lb (140 kg)

Components

• Compressor: 2 spool, 1-stage fan and 3-stage LP axial, 1 centrifugal
• Turbine: 2 spool, 1 HP and 2 LP

Performance

• Maximum thrust: 1,846 lb_f (8.21 kN)
• Specific fuel consumption: 0.486 lb/lbf/h (13.77 g/kN/s)
• Thrust-to-weight ratio: 6