JAXA
Rings of Explosions in the Sky

Japan Tests Exploding Rocket Engine for the First Time in Space

byVictor Tangermann
Aug 19
JAXA

This could be a game changer for deep space exploration.

Ring of Explosions

Japan’s space agency JAXA has announced that is has successfully demonstrated the operation of a “rotary detonation engine” in space, a world’s first.

Such an engine uses a series of controlled explosions that travel around a circular channel at its base. The result is a massive amount of thrust coming from a much smaller engine using significantly less fuel — a potential game changer for deep space exploration, according to JAXA.

It’s a lucrative endeavor and Japan isn’t the only country pursuing the idea. Researchers across the US are testing out the technology to make rockets both lighter and more environmentally friendly.

Sounding Success

On July 27, JAXA launched a 30-foot sounding rocket from the Uchinoura Space Center to test a pair of futuristic propulsion systems at an altitude of about 146 miles.

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After recovering the rocket from the ocean, JAXA engineers pored over the data and found that their experiment was a success.

After first stage separation, the rocket kicked off the test demonstrations, burning the rotary engine for six seconds, while a second “pulse detonation engine” — a not dissimilar system that uses detonation waves to burn fuel and oxidizer — operated for two seconds on three occasions.

The rotary engine produced about 500 Newtons of thrust, only a fraction of what conventional rocket engines are capable of.

According to the agency however, their successful in-space test is proof that rotating detonation engines could indeed allow us to travel deep into space using a fraction of the fuel and weight.

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“We will aim to put the technology into practical use in about five years,”Jiro Kasahara, a Nagoya University professor who is working on the technology with JAXA, told the Japan Times last month.

READ MORE: Successful space demonstration experiment of detonation engine for deep space exploration by sounding rocket S-520-31 [JAXA]

More on rotary detonation engines: Scientists Build Rocket Engine Powered by Spiraling Explosions


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