The largest-ever solid rocket engine is ready for its first static fire
 

This week, the European Space Agency (ESA) will perform a hot fire test on the P120C rocket engine. It is the largest-ever solid rocket motor ever built in one piece. The ESA plans to use it on the Vega rocket, replacing the current first stage boost...

https://www.engadget.com/2018/07/09/...rocket-engine/