|
|
Post by FabienA380 on Oct 16, 2015 14:59:49 GMT 1
I don't really get it, airlines always state they want bigger planes or the biggest versions of a specific type, but when it comes to real big it seems they don't really want it anymore (A380,B748.....).... Would that mainly be because of the engines' number?..
|
|
|
|
Post by stealthmanbob on Oct 16, 2015 15:04:23 GMT 1
I don't really get it, airlines always state they want bigger planes or the biggest versions of a specific type, but when it comes to real big it seems they don't really want it anymore (A380,B748.....).... Would that mainly be because of the engines' number?.. I suppose engines are the biggest cost of the frame and fuel is the biggest operating cost. They might have to look at the possibility on 4 engine planes of shutting two down when in the cruise ? PS I read some where that they are trialing / testing this for for twin props, shutting one down in the cruise, can't find the article now ! |
|
someone
in service - 1 year
Posts: 3,230
|
Post by someone on Oct 17, 2015 11:19:01 GMT 1
I don't really get it, airlines always state they want bigger planes or the biggest versions of a specific type, but when it comes to real big it seems they don't really want it anymore (A380,B748.....).... Would that mainly be because of the engines' number?.. I suppose engines are the biggest cost of the frame and fuel is the biggest operating cost. They might have to look at the possibility on 4 engine planes of shutting two down when in the cruise ? PS I read some where that they are trialing / testing this for for twin props, shutting one down in the cruise, can't find the article now ! You will still have the drag of four engines, so it will not really help that much About the twin props, sure you don't mean under taxiing? Which many airlines already do |
|
|
|
Post by stealthmanbob on Oct 17, 2015 11:23:43 GMT 1
I read an article about an engine manufacture and they were about to start testing an engine that could be shut down, but easier to restart ! I will try and find it ?
|
|
|
|
Post by stealthmanbob on Oct 17, 2015 11:51:05 GMT 1
I suppose engines are the biggest cost of the frame and fuel is the biggest operating cost. They might have to look at the possibility on 4 engine planes of shutting two down when in the cruise ? PS I read some where that they are trialing / testing this for for twin props, shutting one down in the cruise, can't find the article now ! You will still have the drag of four engines, so it will not really help that much About the twin props, sure you don't mean under taxiing? Which many airlines already do I found this article, may be I thought it was for aircraft as well, here it is www.flightglobal.com/news/articles/turbomeca-eyes-flight-tests-of-engine-sleep-mode-417150/ |
|
|
|
Post by Jkkw on Oct 17, 2015 12:50:18 GMT 1
I suppose engines are the biggest cost of the frame and fuel is the biggest operating cost. They might have to look at the possibility on 4 engine planes of shutting two down when in the cruise ? PS I read some where that they are trialing / testing this for for twin props, shutting one down in the cruise, can't find the article now ! You will still have the drag of four engines, so it will not really help that much About the twin props, sure you don't mean under taxiing? Which many airlines already do Regarding propeller aircraft, I know that during the search for MH370, the RAAF's AP-3C Orions would shut down two of their four engines in order to maximise endurance which allowed more time in the search area. Props however have the advantage of being able to be feathered which reduces the drag of a non operating engine in flight. |
|
mjoelnir
in service - 2 years
Posts: 4,089
|
Post by mjoelnir on Oct 17, 2015 14:18:41 GMT 1
You will still have the drag of four engines, so it will not really help that much About the twin props, sure you don't mean under taxiing? Which many airlines already do Regarding propeller aircraft, I know that during the search for MH370, the RAAF's AP-3C Orions would shut down two of their four engines in order to maximise endurance which allowed more time in the search area. Props however have the advantage of being able to be feathered which reduces the drag of a non operating engine in flight. And the Nimrod shut two of its jet engines down while loitering. There are certain criterias we should not forget, a four engined aircraft can shut down two engines without misaligned thrust and the Nimrod and Orion are extending time in the air while flying slow, not distance covered with the least fuel. |
|
s543
in service - 2 years
Posts: 3,957 
|
Post by s543 on Oct 17, 2015 14:26:02 GMT 1
A different but similar thing - I do believe we will see in a not so far future taxiing system running on electricity from the APU only. There were tests of this system done by both big OEMs, but still a lot of problems on the way.
But this will come. Because the amount of fuel consumed while taxiing is not negligible - but a question of weight of this system remains.....
The drag of the jet engine is HUGE and we can hardly imagine similar thing like propeller plane can do.
|
|
|
|
Post by stealthmanbob on Oct 17, 2015 14:28:43 GMT 1
This is all getting discussed in the thread of a two engined plane, may be the posts need moving to a new thread ? Say - Fuel saving by engine(s) snooze / shutdown ?
|
|
|
|
Post by stealthmanbob on Oct 17, 2015 14:34:56 GMT 1
A different but similar thing - I do believe we will see in a not so far future taxiing system running on electricity from the APU only. There were tests of this system done by both big OEMs, but still a lot of problems on the way. But this will come. Because the amount of fuel consumed while taxiing is not negligible - but a question of weight of this system remains..... The drag of the jet engine is HUGE and we can hardly imagine similar thing like propeller plane can do. Tug taxing trials are be carried out at Frankfurt I believe ? The electric motor taxing test were carried out on a modified A320 as well. Similar to the F1 system of capturing the energy from braking to charge batteries ? |
|
