12

Rotor bowing is not unique to this generation of engines. It was an issue with the early IAE V2500. I remember initially they would have somebody manually rotate the fan some time after shutdown. This engine still has a longer start motoring period over the comparable CFM. The root cause is simply making the shafts thinner, increasing their flexibility. ...


7

It is a Trailing Static or Trailing Cone used in test aircraft to measure free stream values. From Airdata Measurement and Calibration: By trailing a long tube behind the airplane, a nearly free-stream static pressure measurement can be taken. A perforated cone at the end of the tube acts as a drag device to keep the tube stable. Image from NASA Airdata ...


7

How does adding more options for engines for potential customers act as an advantage for the Aircraft Manufacturer? There are a couple of ways of looking at this Why new options? Why multiple options Change The A320 has been around a while, engines have improved a lot and newer types of engine exist now that were not available before, even though the ...


5

Not only is rotor bow not unique to this generation of engines, per @user71659's excellent answer, it's not even unique to jet engines. If you go back through the literature, you can find references to it on steam turbines, which have a very similar problem. Many steam turbines are kept rotating at 1 rpm or so while shutdown in order to keep the rotor ...


5

It's not unique to the LEAP. You can find similar grills on the CFM56-5 and Trent 700, for example. That grill is the PCE's (precooler heat exchanger) air outlet. Compressed (hot) air is taken from the engines (before combustion) for pressurization and air conditioning. This air has to pass through a PCE (cooled by air from the fan) before heading to the ...


4

There are of course various factors that play in here but lets look at base numbers Airbus 321 Cruise Speed: 515 MPH Airbus 330-900 Neo: no cruise data published yet Boeing 787-9 Cruise Speed: 561 MPH Airbus 320-200 Cruise Speed: 514 MPH With the above listed speeds rough estimates of travel time would be Airbus 321: 3.85 Hours Airbus 330-900 Neo: no ...


3

How does adding more options for engines for potential customers act as an advantage for the Aircraft Manufacturer? The primary reason for adding a new engine option is to increase performance. As technology improves, engines get more efficient, so putting new engines on a plane can substantially improve the efficiency of the plane. Both the LEAP-1A and ...


2

Well, let's take a look, what are the advantages of having a choice of engine? The A320neo is set to offer engines from two different manufacturers: the CFM International Leap 1A, and the Pratt & Whitney PW1100G. These families of engines are designed to be more fuel-efficient, and what ever more "efficients" there are. How does adding more options ...


2

According to Airbus Airbus quote a single range figure of 6300km for the A320neo This is 100km more than Airbus claim for the A320ceo with sharklets but the difference is probably due to increased fuel capacity in the A320neo and possibly to revised wingtip arrangements. The difference in range between older A320 (~5700km?) and A320 with sharklets (~...


1

It leads to a vent in the cargo compartment that Airbus calls "Outlet-Extraction". It must be an option that isn't installed very often.


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