J58 jet engine and supersonic flight

In summary, there have been discussions on the SR-71 and its related craft, as well as its J58 propulsion system, on various forums. Some of the SR-71s can be found in museums, including one at Duxford, England. There is a video discussing the J58 and its challenges, such as thermal expansion and cooling. Some humorous anecdotes were also shared, including the use of 400ci Buick V8 engines in the USA. One individual shared their experience living near a Blackbird base and the distinct sound it made during takeoff.
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We've had several threads on the SR-71 (and related craft) and the J58 propulsion system.

https://www.physicsforums.com/threads/sr-71-blackbird-supersonic-aircraft.68694/
https://www.physicsforums.com/threads/j-58-engine-inlet-spike.413262/
https://www.physicsforums.com/threads/high-altitude-aerodynamics-and-propultion.290296/

One can find the SR-71s in various museums around the country, and one is at Duxford, England, one of the bases from which they operated.
https://www.iwm.org.uk/history/sr-71-blackbird

I just want to add the following video since it discusses the J58, and of the materials, and some of the challenges for that kind of propulsion system - e.g., thermal expansion and cooling of the engine.

 
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ohhh enjoyed that ... very informative, thankyou :smile:

and with some giggles, specially about using up all the 400ci Buick V8 engines around the USA hahaha
 
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davenn said:
ohhh enjoyed that ... very informative, thankyou :smile:

and with some giggles, specially about using up all the 400ci Buick V8 engines around the USA hahaha
My dad went to college in the early 80s at CSU Chico, not too far away from Beale AFB (home base for the Blackbirds), and he said you could always tell when a Blackbird was getting ready to launch. Sounded like a drag race, but much longer than normal.
 

1. What is a J58 jet engine?

A J58 jet engine is a type of turbojet engine that was used in the SR-71 Blackbird, a supersonic reconnaissance aircraft. It was designed and manufactured by Pratt & Whitney and was known for its high speed and altitude capabilities.

2. How does a J58 jet engine work?

The J58 jet engine works by taking in air through the front of the engine and compressing it with a series of rotating blades. The compressed air is then mixed with fuel and ignited, creating a high-pressure, high-temperature gas that is forced out of the back of the engine, creating thrust.

3. What is unique about the J58 jet engine?

The J58 jet engine is unique because it has a variable geometry inlet and a variable area exhaust nozzle, allowing it to change its shape and adapt to different flight conditions. It also has a unique afterburner system that allows it to operate at supersonic speeds for extended periods of time.

4. What is supersonic flight?

Supersonic flight is when an aircraft travels faster than the speed of sound, which is approximately 767 miles per hour at sea level. This creates a sonic boom, a loud noise caused by the shock waves created by the aircraft breaking the sound barrier.

5. How fast can the J58 jet engine and SR-71 Blackbird fly?

The J58 jet engine and SR-71 Blackbird were capable of flying at speeds of up to Mach 3.3, or over 2,200 miles per hour. This allowed them to complete reconnaissance missions in a fraction of the time it would take a traditional aircraft.

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