Rockets

A Self-Eating Engine Could Make Rockets More Efficient

There can’t be many ideas that beat the crazy yet ingenious idea of a rocket engine that uses part of the fuselage for fuel! Typically a rocket will utilise multiple stages so that excess weight can be jettisoned allowing the rocket to be as efficient as possible. Now a team in Scotland is working on a rocket engine that consumes part of its body to use as fuel, reducing weight and providing even more thrust so that greater payloads can be used. 

Rockets go back thousands of years from the earliest rocket-propelled arrows used by the Mongolian empire to the mighty Saturn V rocket that took Apollo astronauts to the Moon, the principle has remained largely the same. Take a fuel, cram it inside a container of some sort, ignite it in some way and you can use it to propel something forwards or upwards… or actually backwards too now I think about it. 

The Apollo 10 Saturn V during rollout. Credit: NASA

Things are changing though. A team from the James Watt School of Engineering at the University of Glasgow and led by Professor Patrick Harkness have developed the self-eating rocket engine! When the ‘autophage’ (from the Latin for self-eating) fires it consumes part of its own body for fuel. 

It’s quite an ingenious concept, essentially some fuel is stored up inside the rocket chamber itself. As the engine fires, some of the heat melts through the plastic of its fuselage and as the plastic melts, it is fed into the chamber as fuel to supplement the usual liquid propellant. 

Using the rocket chamber as fuel means less fuel has to be carried and more massive payloads can use the mass saving up. There are further benefits too, as the rocket chamber is used in the combustion it will reduce the chances of space debris. 

The idea is not a new one though since the idea of a self-eating rocket was first discussed just over 80 years ago. The team from Glasgow have taken the concept a step further though by building one! The container was made out of polyethylene plastic which would burn as suplementary fuel alongside the regular liquid propellant, a mix of gaseous oxygen and liquid propane. 

They successfully fired the engine that they called Ouroborous-3 which produced 100 newtons of thrust. The thrust was stable even through the autophage stage when the plastic case provided a fifth of the total propellant used.  

Previous rocket tech used solid propellant, for example, the solid boosters on the side of the space shuttle and once this stuff was lit, whether you liked it or not, you were going into space. This new design is controllable, indeed the team demonstrated how it could be restarted, throttled and pulsed in an on/off pattern, all of which are necessary for an efficient rocket engine. 

Source: Self-Eating Rocket Could Help UK Take a Big Bite of Space Industry

Mark Thompson

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