>>2048180
Turbojets have dogshit fuel consumption, which is the single largest factor affecting whether or not a plane is profitable to fly. There is basically no such thing as an "efficiency tuned turbojet" since they've stopped putting pure tubojets on planes decades ago. Even high-speed military fighters are flying low bypass turbo fans now and none of those engine are suitable for a commercial airliner. Boom also need to put four of them on each plane, so wringing every single bit of efficiency out of the engine is essential. As is, their airliner is expected to burn three times the fuel weight per passenger as subsonic airliners. Even more fuel costs are expected because they plan on only allowing it to fly with sustainable aircraft fuel, which is more expensive than normal jet A/A-1.

They *need* a turbofan and making a whole new commercial engine is almost a bigger task than building the rest of the plane. I would be real neato if they manage to pull it off, but I'm not expecting anything. The absolute best scenario I expect is a handful of janky prototypes too shitty for commercial operation. Most likely, they'll never actually have enough of an engine to even fly.