How Does Germany's low-cost Launch Vehicle "OTRAG Work?

Germany has a clever way to send things into space using a low-cost launch vehicle called OTRAG, it's like having a group of little helpers working together instead of one big hero.

Imagine you're trying to lift a heavy box up to the top shelf. If you’re by yourself, that’s tough! But if your friends help you push from below, or pull from the side, it becomes much easier, and faster too!

OTRAG works like this: It uses many small rocket engines instead of one huge one. These little engines are like a team of tiny workers. Each one pushes hard for a short time, then steps aside so others can take over. This way, the whole system is lighter and cheaper to build, it’s like using a bunch of small blocks instead of one giant block.

When rockets use big engines, they need strong materials to hold everything together. But OTRAG's smaller engines mean less stress on the rocket body, kind of like how a backpack with smaller pockets is easier to carry than one with a single huge compartment.

Also, because each engine can be built separately and used for different parts of the journey, it’s much cheaper overall, just like buying several small toys instead of one expensive big toy.