Turboprop and Turboshaft Engines
How Turboprop Engines Work
A turboprop engine bears a functional similarity to a turbofan, in that the shaft of the engine is used to drive another system. The other system is in this case a gearbox and a propeller, rather than a ducted fan. The core engine is designed much more in focus on creating torque, rather than providing thrust. The core should account for less than 10% of the engine's total thrust.
A turboshaft engine is similar in concept, but instead of the propeller, the gearbox exits to some other device. The most common use is to power a helicopter rotor.
Details of Various Turboprop Engines
Details of Various Turboshaft Engines
- Allied Signal
- Allison Engines
- Light Helicopter Turbine Engine Company
- Pratt & Whitney Canada
Comparison Tables of Various Engines
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Turboprops
Make Model Application Horsepower (T/O | Cruise) SFC (T/O | Cruise) Pressure Ratio Length x Diameter (in) Weight (lb) Allied Signal TPE331-8 Cessna Conquest 755 | ?? 0.568 | ?? 10.3 43 x 26 370 Allison Engines AE2100 C-130J 6000 | ?? T56-A-14 P-3C Orion 4591 | ?? 0.54 | ?? 9.6 146.3 x 49 1890 GE CT7-7A CASA/IPTN CN235 1700 | 1312 0.474 | 0.429 17 96 x 29 783 Pratt CA PT6A-135B Too may to list! 750 | ?? 0.659 | ?? 7 63 x 19 346 PW124B ATR 72 2400 | ?? 0.468 | ?? 13.9 84 x 25 1060 Turboshafts
Make Model Application Horsepower (T/O | Cruise) SFC (T/O | Cruise) Pressure Ratio Length x Diameter (in) Weight (lb) Allied Signal LTS101-600A-3 Eurocopter AS 350D 615 | ?? 0.58 | ?? 8.4 31 x 21 253 T53-L-703 Bell AH-1S Cobra 1800 | ?? 0.568 | ?? 8 47.6 x 23 545 Allison 250-C30M AS 350G 650 | 600 0.59 | ?? 8.6 43.2 x 25.7 250 LHTEC T800-LHT-801 RAH-66 Comanche 1563 | ?? 0.46 | ?? 14.1 31.5 x 26.8 330 Pratt Canada PT6B-36B Sikorsky S-76B 981 | ?? 0.581 | ?? 7.1 59.2 x 19.5 378 PW206D Bell 427 611 | ?? 0.541 | ?? 8 35.9 x 22.3 ~240
Turbofans : Ramjet 