Here we go, yet another way to turn a propeller. I covered “turboprop” and conventional piston engines, so now on to this. A turboshaft is very similar to a turboprop, just rearranged a bit to make it more versatile. It still uses jet fuel and still uses its power to turn a propeller instead of making direct drive thrust, but there are a few main differences. On a turboprop, the propeller is attached directly to the engine itself. This creates a lot of load on the engine and means that it must be constructed stronger, and theirfore heavier. It also means that (obviously) the engine must be located where you want the prop to be. On a turboshaft, a driveshaft is used to turn gears and/or a transmission to re-direct the power to the prop, wherever it may be. Thus the engine itself does not directly take the load of the prop, and can be located anywhere in the vehicle. A good example of this principle is the lift fan in the f35 lightning 2 (I posted a few days ago-check it out). The lift fan is mounted horizontally in the aircrafts hull and need to pull air straight through it, so the rotors had to be free of any engine obstructions, so the shaft drives the rotors remotely. Heres a general turboshaft diagram…

Heres a funny fact, the first war vehicle to use this engine was a German “Panther” tank in 1944!

that’s it for now, stay tuned.


3 responses to “Turboshaft

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