Williams FJ33
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The Williams International FJ33 is a family of turbofan jet engines intended for use in very light jet aircraft. Sources suggest that the FJ33 is a scaled-down version of the FJ44 engine.
Engine configuration is believed to be a single stage fan, with booster stage/s, driven by a 2 stage LP turbine, supercharging a centrifugal HP compressor, driven by a single stage HP turbine. An annular combustor is featured.
The FJ33 has a dry weight of less than 300 lb, overall diameter of 21.05in, 47.9in overall length, and produces between 1000 and 1800 lbf static thrust. Specific fuel consumption at 1200 lbf thrust (SLS, ISA) is understood to be 0.486 lb/h/lbf.
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[edit] FJ33 versions
| FJ33 leading particulars | |||||||
|---|---|---|---|---|---|---|---|
| FJ33-1 | FJ33-2 | FJ33-3 | FJ33-4-A11 | FJ33-4 | FJ33-4-17M | FJ33-4-18M | |
| Static thrust (foot-pounds) | 1,200 | 1,300 | 1,400 | 1,100 | 1,500 | 1,700 | 1,800 |
| Specific fuel consumption (pounds/hour/lbf) SLS, ISA | 0.486 | ? | ? | ? | ? | ? | ? |
| Bypass ratio | 3.28 | ? | ? | 3.4 | ? | ? | ? |
| Dry weight (pounds) | <300 | <300 | <300 | <300 | <300 | >310 | >310 |
| Overall length (inches) | 47.9 | 47.9 | 47.9 | 47.9 | 47.9 | 47.9 | 47.9 |
| Approximate fan diameter (inches) | 17.3 | 17.3 | 17.3 | 17.3 | 17.3 | 17.3 | 17.3 |
The -1, -2 , -3 and -4-A11 are believed to be essentially derated versions of the -4. Presumably the -17M and -18M are throttle pushed versions of the -4, but without any flat-rating to a hot day.
[edit] FJ33 applications
The FJ33 powers a number of different aircraft:
- Adam A700 AdamJet: 2× Williams FJ33 (not certified)
- ATG Javelin Mk 10: 2× Williams FJ33-4-17M 1700 lbf static thrust (not certified)
- ATG Javelin Mk 20 military trainer: 2× Williams FJ33-4-18M 1800 lbf static thrust (not flown)
- Diamond D-Jet: single FJ33-4 1400 lbf static thrust, flat-rated to ISA+7.2C (not certified)
- Excel Sport Jet: single FJ33-4 (stopped following accident)
- Maverick LEADER Jet: twin FJ33-4-A11 1100 lbf static thrust (not certified)
- Spectrum Aero Model 33: 2× Williams FJ33-4 (stopped following accident)
- TAM-AIR Epic Jet: 2× Williams FJ33-4 (not flown)
- TAMJet
- Safire Jet: twin FJ33-4-A11 1100 lbf static thrust (program stopped)
- Cirrus "The-Jet" FJ33-4A-19 1900 lbf static thrust (under development)
