The General Electric TF39 High-power, High-bypass Jet Engine Powers the Stunning C-5 Super Galaxy

The TF39 turbofan engine powers the C-5 Galaxy. Here's a comprehensive review:

Performance Characteristics

1. Thrust: 43,300 pounds (193 kN)
2. Specific Fuel Consumption: 0.315 lb/lb-hr
3. Bypass Ratio: 8.0:1
4. Compression Ratio: 27:1
5. Fan Diameter: 122.5 inches (311 cm)

Design Features

1. High-Bypass Turbofan: Efficient fuel consumption
2. Dual-Rotor Fan: Improved thrust and stability
3. Advanced Compressor: High-pressure ratio for efficient operation
4. Annular Combustor: Efficient fuel mixing and combustion
5. Mechanical Drive: Simple, reliable engine architecture

Reliability and Maintenance

1. Proven Track Record: Reliable operation in various environments
2. Modular Design: Easy maintenance and repair
3. Extended Service Life: Upgrades and overhauls available
4. Fault-Tolerant Systems: Redundant systems for enhanced safety

Advantages

1. Efficient Fuel Consumption: Reduced operating costs
2. High Thrust-to-Weight Ratio: Excellent takeoff and climb performance
3. Low Noise Levels: Reduced noise pollution
4. Reliable Operation*: Minimal downtime

Disadvantages

1. Complexity: Higher maintenance requirements
2. Weight: Contributes to overall aircraft weight
3. Cost: Expensive to purchase and maintain
4. Limited Power Reserve: Reduced thrust during emergency situations

Applications

1. C-5 Galaxy: Primary engine
2. C-5A: Initial variant
3. C-5B: Upgraded variant
4. C-5C: Cargo variant

Upgrades and Modernization

1. TF39-GE-1C: Upgraded variant with improved efficiency
2. Reliability Enhancement Program: Improved engine reliability
3. Engine Modernization Program: Upgrades for extended service life

Specifications

1. Length: 184.5 inches (469 cm)
2. Diameter: 122.5 inches (311 cm)
3. Weight: 6,260 pounds (2,840 kg)
4. Fuel Type: Jet-A1

Sources:

1. General Electric Aviation (GEA)
2. Lockheed Martin (C-5 Galaxy manufacturer)
3. NASA Technical Reports
4. Aviation Week & Space Technology
5. Military Aviation Authority