The rocket that thinks it's a jet

Skylon in orbit. Credit: Reaction Engines Ltd / Adrian Mann
( -- A reusable spaceplane that can take off from a conventional aircraft runway, carry over twelve tonnes to orbit and then return to land on the same runway could be less than a decade away thanks to a one million euro award by the European Space Agency (ESA).

The contract awarded to Reaction Engines Limited (REL), is part of a joint public and private multi-million pound development programme, that will demonstrate the core technologies for the SABRE air-breathing rocket engine, which will power the SKYLON spaceplane.

The SABRE is a unique hybrid engine that can "breathe" air when in the atmosphere, like a jet engine, and become a rocket engine when in space. In air-breathing mode air is first cooled by a revolutionary heat exchanger pre-cooler before being compressed and fed to the rocket engine to be burnt with hydrogen fuel. When in rocket mode the hydrogen is burnt with liquid oxygen.

Alan Bond, Managing Director of REL, said: "Traditional throw-away rockets costing more than a $100 million per launch are a drag on the growth of this market. The Holy Grail to transform the economics of getting into space is to use a truly re-usable spaceplane capable of taking off from an airport and climbing directly into space, delivering its satellite payload and automatically returning safely to Earth."

The demonstration programme has the objective of removing all the outstanding technical concerns on the SABRE engine. This will pave the way to a full engine development programme as part of the overall development of SKYLON. Cheap, easy and reliable access to space is critical to the development of the global space market, now worth more than $150 billion a year worldwide.

The demonstration programme will look at three key areas in the engine.

The first area, conducted by REL, concerns the revolutionary precooler that cools the incoming air as it enters the engine. During the programme a test precooler will be constructed using the actual module design for the flight engines. This will be tested on the company's B9 jet engine powered experimental facility at Culham in Oxfordshire.

The second area is the cooling of the combustion chamber, where the propellants are mixed and burnt producing water vapour at around 3,000°C. The SABRE engine uses the air or liquid oxygen as the cooling fluid - a key and unusual design feature as most rocket engines use the hydrogen fuel for cooling instead. EADS Astrium and DLR in Germany will be conducting this work using demonstration chambers fired at the DLR Lampoldhausen facility.

The third area, led by the University of Bristol, will explore advanced exhaust nozzles that can adapt to the ambient atmospheric pressure. This follows on from the successful STERN (Static Test of ED Rocket Nozzle) test rocket programme that was conducted last year. As part of the ESA contract a new water cooled chamber will be constructed and test fired.

More information:

Provided by Britich National Space Centre (BNSC)

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Citation: The rocket that thinks it's a jet (2009, February 19) retrieved 18 June 2019 from
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Feb 19, 2009
This idea has been around for years. First incarnated as HOTOL in 1986:

Feb 19, 2009
If the one decade forecast is realistic this would be a great step indeed. Having a craft that can take off on it's own from a conventional runway and make it to orbit without carrier rockets would be revolutionary.

Feb 19, 2009
"This idea has been around for years. First incarnated as HOTOL in 1986: "

Right! I remember that! I wonder if this idea will "take off" this time....

Feb 20, 2009
Finally someone got the guts to put these ideas into a decent pitch. The technology has been developing for some time and the efficiency is apparent. If they can work out a few kinks I'd say they'll be making it in 10 years.

As for flying in full operation...I'd give it some time before estimating...

Feb 20, 2009
I could make a ballon people could ride into space. Screw planes lets make blimps the right way... Why doesn't a hot air ballon have the fire inside it and build up air pressure by not having the open part? Simple and easy space ballon.

Feb 20, 2009
I hope these things actually get built. The design idea alone would hopefully spur private spaceflight companies into new projects.
Also, I'd love to ride in one of those.

Feb 20, 2009
I could make a ballon people could ride into space. Screw planes lets make blimps the right way... Why doesn't a hot air ballon have the fire inside it and build up air pressure by not having the open part? Simple and easy space ballon.

Because as air-pressure drops, so does your bouyancy.

Feb 20, 2009
Is this named after the Skylon tower at the Festival of Britain in 1951? There is certainly a resemblance in its shape. See http://en.wikiped..._(tower)

Feb 20, 2009
how about a rocket powered hydrogen blimp.

Feb 20, 2009
Blimps work on the concept of density differences. Hydrogen floats because its lighter than air. Except, in the upper reaches of the atmosphere, the air is lighter than everything. A blimp wouldn't work. It would just float until it reached its maximum height, and go no further. The highest-reaching airships that are supposed to go into service are supposed to go no higher than around 70,000 feet, or less than 14 miles up. The atmosphere's boundary is widely accepted to be around 62 miles high. That's quite a difference.

Feb 21, 2009
I could make a ballon people could ride into space.

Just a couple of niggling problems. The balloon has to be extremely light, have to have room to expand by about a factor 100, has to use extremely expensive helium that would be difficult to retrieve or large amounts of somewhat hazzardous hydrogen gas.

You'd still be limited to about 35-50 km.

That's not space(your orbit would decay very quickely at that altitude). It's not an orbit because you have no tangential velocity at all.

Joseph Kittinger parachuted from a balloon at 31 km as part of preparations for the US space programme in 1960.

Unmanned balloons have gone to 50 km(with 3.4 micron thick polyethylene and a volume of 60 000 m^3).

Feb 21, 2009
(the BU60-1 balloon that reached above 50 km weighed 34.37kg empty and had dimension 74.5m in length, and 53.7m in diameter; they had to invent a new method to make thinner plastic. It used 1000 m^2 helium(ground level) to lift a 5 kg instrumentation package. But I'm sure you know better Magpies, it's clearly trivial to make a balloon that can take you into space, all you have to do is take copious amounts of LSD)

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