Boeing is building the 787 with engines that will not output bypass air,
stating that this will offer great savings.
As a sanity check, will a bleedless aircraft really save that much money
overall ?
Once you add the extra generator torque needed, and all the weight of
the new systems that will use electricity instead of bleed air, will it
still represent a significant savings ?
Are the electrical stand-alone systems (such as cabin air compressors)
already available and known quantities (such as weight, and electrical
requirements), or are those still being developped ?
I assume that the starter motor will act as a generator once the engine
has started ? Or will the two be separate entities ?
Also, has there ever been consideration of having variable bleed air by
having a valve at/near the core so that when the aircraft is at cruise,
less bleed air would be "wasted" than when , of instance, aircraft is
descending through clouds and de-icing is needed ?
(P.S I tried posting this before, but post never showed up, so I am
sending this as an email to the sci=aeronautics=airliners @[EMAIL PROTECTED]
as email ).
|
