InevitableRip8968 t1_irp5ln6 wrote on October 9, 2022 at 11:35 PM

Reply to comment by Good-Cardiologist679 in TIL that passenger jet engines produce most of their thrust from fan at the front, not from the jet exhaust, and that this is called a high-bypass engine. by Rilot

No

InevitableRip8968 t1_irp5jyq wrote on October 9, 2022 at 11:35 PM

Reply to comment by kassienaravi in TIL that passenger jet engines produce most of their thrust from fan at the front, not from the jet exhaust, and that this is called a high-bypass engine. by Rilot

20-30% of the thrust comes from the core, or turbine. The other 70-80% comes from the fan.

InevitableRip8968 t1_irp5fv0 wrote on October 9, 2022 at 11:34 PM

Reply to comment by InappropriateTA in TIL that passenger jet engines produce most of their thrust from fan at the front, not from the jet exhaust, and that this is called a high-bypass engine. by Rilot

Thrust is generated by the core and the high bypass. It’s around 70% thrust from the high bypass and 30% from the core. On newer engines it’s getting closer to 80% from the high bypass and 20% from the core.

InevitableRip8968 t1_irp3kxd wrote on October 9, 2022 at 11:19 PM

Reply to comment by dyskinet1c in TIL that passenger jet engines produce most of their thrust from fan at the front, not from the jet exhaust, and that this is called a high-bypass engine. by Rilot

Turboprops are considered the most efficient of all the different turbines, burns less fuel than the rest. But you trade speed for the efficiency.

InevitableRip8968 t1_irp38q4 wrote on October 9, 2022 at 11:16 PM

Reply to comment by mrkmg in TIL that passenger jet engines produce most of their thrust from fan at the front, not from the jet exhaust, and that this is called a high-bypass engine. by Rilot

Can you show me proof? Bypass ratio always stays the same. This is taking in to factor if you ignore bypass ducts that newer engines use.

InevitableRip8968 t1_irothk8 wrote on October 9, 2022 at 10:00 PM

Reply to comment by TheNiftyReptile in TIL that passenger jet engines produce most of their thrust from fan at the front, not from the jet exhaust, and that this is called a high-bypass engine. by Rilot

This is very wrong. Even at altitude the fan is what’s creating most of the thrust. The ratio of thrust between the core and high bypass stays the same at all altitudes. The overall performance decreases at altitude due to the air thinning out.