The J47 took jet propulsion from experimental curiosity to mass-produced reality. Over 35,000 units were built, and the -GE-25 variant specifically powered B-47B, E, H, K, and L series bombers. Its 12-stage axial compressor was advanced for its time, delivering pressure ratios that centrifugal designs couldn’t match.
J47-GE-25 Performance Data
The primary subject of this technical guide focuses on the General Electric J47-GE-25 engine, engineered specifically for Turbojet applications. Below is an essential digest of this powertrain configuration.
• 35,000+ J47s built
• 5,670 lbf thrust
• 12-stage axial compressor
• Powered B-47 bomber variants
J47-GE-25 Technical Notes
12-stage axial compressor, single-stage axial turbine; 5,670 lbf thrust at 7,950 rpm; weight 2,707 lb; maximum operating altitude 50,000 ft.
The J47’s story is one of scale and reliability rather than raw performance. By the time production ended in 1956, more than 35,000 J47s had been manufactured, making it the most mass-produced turbojet in history. The -GE-25 variant represented a mature production standard, with refinements that improved durability in the demanding B-47 bomber mission profile.
| Type | Turbojet |
|---|---|
| Compressor | 12-stage axial |
| Turbine | Single-stage axial |
| Thrust | 5,670 lbf |
| Max RPM | 7,950 |
| Weight | 2,707 lb |
| Fuel | JP-4 / Jet fuel |
| Max Altitude | 50,000 ft |
Aircraft Powered by the J47-GE-25
This engine model is deployed across various operational frameworks. Here is a breakdown of the typical machine or vehicle applications using this unit:
Boeing B-47B/E/H/K/L Stratojet
Pros & Advantages
Most-produced turbojet in history; reliable for its era; proven in bomber service.
Cons & Disadvantages
Low thrust by later standards; high fuel consumption; obsolete by late 1950s.
Frequently Asked Questions (FAQs)
Q1: What was the J47’s production total?
A1: More than 35,000 J47 engines were manufactured, making it the most mass-produced turbojet in history.
Q2: Which aircraft used the J47-GE-25 specifically?
A2: The -GE-25 variant powered Boeing B-47B, E, H, K, and L series Stratojet bombers.
Q3: How high could the J47-GE-25 operate?
A3: The engine had a maximum operating altitude of 50,000 feet.
It used a 12-stage axial compressor, a design choice that offered higher pressure ratios than centrifugal alternatives of the era.