Hi there, yes, I have heard of hybrid rockets! They're cool
Hybrid rockets are described as
hybrid because its oxidizer is a liquid and its fuel is a solid. These are separated to prevent accidental detonation, as shown in the drawing above. According to
this Wikipedia, hybrid rockets avoid some of the disadvantages of
solid rockets like the dangers of propellant handling, while also avoiding some disadvantages of
liquid rockets like their mechanical complexity. In addition, they are known for their ability to be throttled, stopped, and restarted during flight, though, not as reliably as liquid rockets.
In the classical arrangement, one or more ports are present in the fuel grain whereby the oxidizer flows and burns with the fuel vapors. When speaking about hybrid rockets, one cannot avoid stating that, although they may seem to lie somewhere between a liquid and a solid propellant system, this propulsion technology, thanks to the phase separation of the two propellants and the vast choice of available inert fuels, features unique advantages, well known in the propulsion community, which are not enjoyed by either liquids or solids. In fact, because they essentially preserve performance comparable to the high level of the most complicated liquid rocket engines, their several benefits, spanning lower development cost, higher safety and less environmental impact, can lead to extensive employment as game changing technology in the current space arena characterized by a dramatic upsurge of worldwide activities and the parallel emergence of different types of space actors.
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