Approved Discussion on SABRE (air-breathing rocket engine)

[Rommy]

Technology Submission
Technology Report Name of Origin Country: Singan/Kazemura Name of Technology/Object SABRE (Synergistic Air-Breathing Rocket Engine) Engine Supporting Real Life References: https://en.wikipedia.org/wiki/SABRE_(rocket_engine) https://vimeo.com/45136248 https://web.archive.org/web/201210211209...08-117.pdf https://www.reactionengines.co.uk/sabre/
Report Description: The SABRE Engine type is to be developed by Singan and Kazemura to develop a new form of efficient propulsion for a planned SSTO and new commercial hyper-sonic aircraft that is cost effective, and relatively cheap compared to other forms of propulsion. The engine will operate as a hybrid hypersonic precooled air-breathing engine; functioning as a single internal cycle, it does feature however two modes of operation. So after take-off as more air is compressed by this turbo-compressor after intake, it is then cooled resulting in this high pressure ratio in the combustion chamber to allow for higher thrust and speeds at high altitudes. Since the air temp is made cool, it allows for lightweight alloys for the engine to be utilized; allowing for a more effective thrust to weight ratio both needed and useful in achieving orbit and making orbital maneuvers. After it reaches about Mach 5, it shuts off the inlet cone, and becomes a closed-cycle using on board stores of oxygen instead. It should be noted the ascent profile is fairly steep for best results. The commercial variant removes the rocket oriented features, and increases bypass features to allow for even greater efficiency. Show ContentImages:

[Ayzek]

This is the engine planned/designed for Skylon, right? Are you imagining it used solely for space flight or also for commercial transportation?

[Rommy]

Skylon was the original intent for the design, as mentioned in the report there is a commercial variant meant for regular airtravel at near-hypersonic speeds. Until its capacity is proven for the Kazemurans/Singanese a commercial variant would be a secondary goal.

https://en.wikipedia.org/wiki/Reaction_Engines_Scimitar
https://en.wikipedia.org/wiki/Reaction_Engines_A2

[Ayzek]

The Directorate:

• clarifies it is considering "hypersonic precooled air-breathing rocket engine" technology,
  
• approves this submission,
  
• affirms the technology is available to any first-world country with a developed and advanced space program,
  
• grants Kazemura and Singan a leading role in its research and development,
  
• mandates that it may only be used for spacecraft and military aircraft.
  

I'd have more questions if you guys wanna use it for non-spacey commercial stuff, but you guys are in a hurry and that's not what you want, so whatever.