[Gwypaas]

Used everywhere, more complex and has a more limited operating parameters though. In the maritime industry it has generally been military or high speed ferries using them. Essentially, if your ship can get away with a larger more mechanically simple engine it is more economical because as long as they stay on the surface you are not paying the fuel price of also lifting the engine.

Commercial jets use the same mechanics with their turbofan engines. That is why they are growing huge, we're just encasing the propeller inside the cowling, with some other nice side-effects.

https://en.wikipedia.org/wiki/Turboshaft

https://en.wikipedia.org/wiki/Turbofan

[causi]

Every time I look at jet engine diagrams I get chills thinking about what it must take to make mechanical parts that function with that much precision for that many revolutions under that much heat and pressure.

[chasd00]

like many here, I've spent my professional life in software. You can goto walmart, buy a $500 laptop, hook it up to free wifi at a coffee shop and you have access to all the tools you need to build cutting edge software technology. That is not the case in meatspace. Going from an empty space in a factory to a jet engine ready to be installed on a plane blows me away on so many different levels.