5 ms·

False. https://en.wikipedia.org/wiki/NAMC_YS-11 https://en.wikipedia.org/wiki/NAMC_YS-11

by bclemens 6y ago

goldenkey 6y ago
That's a turboprop...Aren't those much less safe than jet engines?
- goodcanadian 6y ago
  No. My understanding is that they are generally even safer. The public doesn't seem to like them as much, though.
- redis_mlc 6y ago
  A turboprop is a jet engine. The propeller moves a large mass of air, increasing efficiency ... like the current turbo fan engines! lol. Pax hate turboprops because of the noise and a misconception that they're not jet engines. There's no inherent safety difference, except that there used to be regional airlines flying with inexperienced pilots like cough Colgan. https://en.wikipedia.org/wiki/Colgan_Air_Flight_3407 https://en.wikipedia.org/wiki/Colgan_Air_Flight_3407
  - falcolas 6y ago
    There’s more moving parts, since each prop has to rotate on its own axis in addition to rotating in line with the aircraft. Jets are stupidly simple, but turboprops are more complex due to these requirements of the props. Turboprops also can’t go as high or fast as jets, because they need a certain amount of air density to operate. They can provide fine-controlled reverse thrust, so they have that going for them. And they’re less complicated (and lighter) than a traditional piston engine, making them a win over normal engines in mid-sized aircraft. EDIT: "Jets" in the above is a poor reference to turbofans, as pointed out by replies. Thanks for the clarification. A Turbofan still has a turbine being powered by a jet engine, similar to a turboprop, but it does not have the complexity associated with being able to change the pitch of the props.
    - vvillena 6y ago
      Is there any modern airliner plane that still uses jets? IIRC all modern passenger plane engines are turbofan engines. Turboprops win at slower speed, while turbofans excel in the fast-but-still-subsonic range.
      - catalogia 6y ago
        There aren't any modern planes still using turbojets. I think the Concorde might have been the last (ceased operation in 2003.) Combat jets often have very low-bypass ratio turbofan engines though. A true turbojet has a 0 bypass-ratio; a lot of turbofan fighter jets have bypass-ratios under 1, while the engines on a 787 have a bypass-ratio of 10. https://en.wikipedia.org/wiki/Bypass_ratio#Engine_bypass_ratios https://en.wikipedia.org/wiki/Bypass_ratio#Engine_bypass_rat...
      - falcolas 6y ago
        I should clarify, when I'm saying "jet", I do mean turbofans. And turbofans still include a jet engine, but the output turns a turbine which rotates the fans.
        catalogia 6y ago
        Turbojets, turbofans, and turboprops all use gas turbines. The "jet" in this context refers to the action of the exhaust, not the mechanism creating the exhaust (which is the gas turbine.) Turbojets and Turbofans both create jets of hot exhaust gas to produce thrust. Turbojets produce thrust exclusively with this jet of exhaust gas, while turbofans produce some [often most] of their thrust by using some of the turbine's output to turn a ducted fan. Turboprops don't produce any meaningful jet of exhaust gas, instead using the output of the gas turbine to turn a propeller. Related to turboprops are turboshaft engines, which turn a power transmission shaft instead of a propeller directly. In some cases, like the V-22 Osprey, the line between a turboprop and a turboshaft is blurred. But some clear examples of turboshaft engines are in modern helicopters and Abrams tanks. There are some kinds of jet engines that don't use turbines. Ramjets and scramjets don't use turbines, but have 'jet' in the name because they produce their thrust using a jet of hot exhaust gas. Rocket engines produce jets of hot exhaust gas, but aren't called jet engines because.. reasons. > jet: A collimated stream, spurt or flow of liquid or gas from a pressurized container, an engine, etc. (Note that this makes turboprop engines not jet engines, but turbojet and turboprop engines are both gas turbine engines.)
- kitteh 6y ago
  Turboprop/turbine engines are quite reliable. Will gladly put my trust in a single engine Pratt and Whitney (Canada) PT6. Piston on the other hand.

False. https://en.wikipedia.org/wiki/NAMC_YS-11 https://en.wikipedia.org/wiki/NAMC_YS-11

goldenkey 6y ago

That's a turboprop...Aren't those much less safe than jet engines?

goodcanadian 6y ago
No. My understanding is that they are generally even safer. The public doesn't seem to like them as much, though.
redis_mlc 6y ago
A turboprop is a jet engine. The propeller moves a large mass of air, increasing efficiency ... like the current turbo fan engines! lol. Pax hate turboprops because of the noise and a misconception that they're not jet engines. There's no inherent safety difference, except that there used to be regional airlines flying with inexperienced pilots like cough Colgan. https://en.wikipedia.org/wiki/Colgan_Air_Flight_3407 https://en.wikipedia.org/wiki/Colgan_Air_Flight_3407
- falcolas 6y ago
  There’s more moving parts, since each prop has to rotate on its own axis in addition to rotating in line with the aircraft. Jets are stupidly simple, but turboprops are more complex due to these requirements of the props. Turboprops also can’t go as high or fast as jets, because they need a certain amount of air density to operate. They can provide fine-controlled reverse thrust, so they have that going for them. And they’re less complicated (and lighter) than a traditional piston engine, making them a win over normal engines in mid-sized aircraft. EDIT: "Jets" in the above is a poor reference to turbofans, as pointed out by replies. Thanks for the clarification. A Turbofan still has a turbine being powered by a jet engine, similar to a turboprop, but it does not have the complexity associated with being able to change the pitch of the props.
  - vvillena 6y ago
    Is there any modern airliner plane that still uses jets? IIRC all modern passenger plane engines are turbofan engines. Turboprops win at slower speed, while turbofans excel in the fast-but-still-subsonic range.
    - catalogia 6y ago
      There aren't any modern planes still using turbojets. I think the Concorde might have been the last (ceased operation in 2003.) Combat jets often have very low-bypass ratio turbofan engines though. A true turbojet has a 0 bypass-ratio; a lot of turbofan fighter jets have bypass-ratios under 1, while the engines on a 787 have a bypass-ratio of 10. https://en.wikipedia.org/wiki/Bypass_ratio#Engine_bypass_ratios https://en.wikipedia.org/wiki/Bypass_ratio#Engine_bypass_rat...
    - falcolas 6y ago
      I should clarify, when I'm saying "jet", I do mean turbofans. And turbofans still include a jet engine, but the output turns a turbine which rotates the fans.
      - catalogia 6y ago
        Turbojets, turbofans, and turboprops all use gas turbines. The "jet" in this context refers to the action of the exhaust, not the mechanism creating the exhaust (which is the gas turbine.) Turbojets and Turbofans both create jets of hot exhaust gas to produce thrust. Turbojets produce thrust exclusively with this jet of exhaust gas, while turbofans produce some [often most] of their thrust by using some of the turbine's output to turn a ducted fan. Turboprops don't produce any meaningful jet of exhaust gas, instead using the output of the gas turbine to turn a propeller. Related to turboprops are turboshaft engines, which turn a power transmission shaft instead of a propeller directly. In some cases, like the V-22 Osprey, the line between a turboprop and a turboshaft is blurred. But some clear examples of turboshaft engines are in modern helicopters and Abrams tanks. There are some kinds of jet engines that don't use turbines. Ramjets and scramjets don't use turbines, but have 'jet' in the name because they produce their thrust using a jet of hot exhaust gas. Rocket engines produce jets of hot exhaust gas, but aren't called jet engines because.. reasons. > jet: A collimated stream, spurt or flow of liquid or gas from a pressurized container, an engine, etc. (Note that this makes turboprop engines not jet engines, but turbojet and turboprop engines are both gas turbine engines.)
kitteh 6y ago
Turboprop/turbine engines are quite reliable. Will gladly put my trust in a single engine Pratt and Whitney (Canada) PT6. Piston on the other hand.