When you come across the title "Is Airbus hiding an evolution?"
Makes a lot of sense if you think about it. Four engine aircraft, so lots of redundancy is something goes seriously wrong and does secondary damage (GE already has a 747-400 based Flying Test Bed - which replaced their 747-100 FTB). Boeing very nearly lost its 'prototype' 767 (VA-001) doing flight testing of the PW4000/94" when it went into non-recoverable surges at 50 ft. during takeoff (and the left seat pilot responded by pulling back both thrust levers 
- fortunately the guy in the right seat quickly responded by firewalling both throttles - the PW4000 responded by continuing to surge but the JT9D kept them flying).
Boeing long used the prototype 747 (RA-001) as a test bed for new engines (it's part of the Seattle Museum of Flight now). I suspect if Airbus is putting a lot of money and emphasis on the project they wouldn't want to see it flying on a 747
.
Plus, early build A380's are readily available cheap...
This was an issue for the 737-3/4/500 series - it cruised significantly slower than other jetliners (although quite a bit faster than 0.72 Mach) - as a result it tended to get less than optimum routing to keep it out of the way of the faster traffic. It was one of the big drivers for the 737 NG program - to modify the wing so it could cruise faster.
- fortunately the guy in the right seat quickly responded by firewalling both throttles - the PW4000 responded by continuing to surge but the JT9D kept them flying).Boeing long used the prototype 747 (RA-001) as a test bed for new engines (it's part of the Seattle Museum of Flight now). I suspect if Airbus is putting a lot of money and emphasis on the project they wouldn't want to see it flying on a 747
. Plus, early build A380's are readily available cheap...
If this Hybrid /ac is planning to be cruising at the same altitudes as the current Jetliners, but at much lower speed, and come in big numbers to replace the A32+s , 737s and 220s, we're going to have a major capacity issue when they arrive as they will not mix well with the current fleets. Or they are going to be left below FL290
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This is mainly history now. Air traffic, at least in my part of the world, does not fly along airways - which were mandated by ground based navigation aids - any more. There is a growing number of countries that have abolished airways altogether. Aircraft now fly direct routes between convenitntly located waypoints. Therefore it does not matter what speed you fly at, because no other aircraft is flying the exact same route as you. There are exceptions like north Atlantic tracks, but I am certain that a solution to that problem will be found as well.
It is optimised to need less fuel. Batteries won't work for big passenger aircraft, so something like the CFM RISE is the next best thing. At least 15 percent less fuel. Plus a new "gull" wing with provisions for even larger diameter engines and possibly moving outer wings, lightweight CFRP-fuselage with wide diameter in the back. Sounds reasonable. I wonder how many seats they install in the cockpit? The funny windows might intend to give some clue?
Anyway, so much better than hydrogen fantasies.
Anyway, so much better than hydrogen fantasies.
"Mildly" Eccentric Stardriver
Some 45 years ago, I was regularly flying a very high bypass unducted fan. Built by Rolls Royce. It was called the Dart 
Nothing much new under the sun.
Nothing much new under the sun.
At the same time the industry has done an amazing job of incrementally squeezing a bit more juice out of the lemon every year. I have seen the figure 1.4% annual improvement in fuel efficiency often quoted.
The same people who were promoting the "revolution "were also saying this improvement in fuel efficiency would stop.
Still it makes some sense for Airbus to take a flutter on the UDF - They have the money and you never know what you will learn along the way.
As they say never let perfection get in the way of good.
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Funny that this is being bandied about as "news", Airbus and CFM launched an open fan flight test demonstrator programme back in July 2022, with press release and everything...
https://www.airbus.com/en/newsroom/p...monstrator-for
https://www.airbus.com/en/newsroom/p...monstrator-for
Thread Starter
Thread Starter
3 Concepts from German DLR Institute within Project Exact, for short- and midrange aircraft, presented in these days.
Hydrogen Mild Hybrid
Battery-Electric Hybrid
Efficient Turboprop with conventional/SAF Fuel
Publication not (yet) avail in English
Hydrogen Mild Hybrid
Battery-Electric Hybrid
Efficient Turboprop with conventional/SAF Fuel
Publication not (yet) avail in English
Last edited by waito; 10th May 2024 at 05:10. Reason: three
Originally Posted by what next
Air traffic, at least in my part of the world, does not fly along airways - which were mandated by ground based navigation aids - any more. There is a growing number of countries that have abolished airways altogether. Aircraft now fly direct routes between convenitntly located waypoints. Therefore it does not matter what speed you fly at, because no other aircraft is flying the exact same route as you.
Pegase Driver
One thing they got right apparently is the hybrid concept . In AERO 24 last month a French company showed a 19 seat hybrid aircraft the ERA, with 150 NM range on pure electric and 600 NM range on hybrid using 2 small APU turbines to recharge the batteries using SAF ,They have already over 500 pre-orders, .mostly from islands and mountainous areas countries., Operational 2028-2029. We'll see.
Last edited by ATC Watcher; 10th May 2024 at 20:00.
They already started the test program using the engine core of a military GE F110 engine.
This is what I remember too (and my degree is not in aircraft propulsion either) but for comparison: The Airbus A400M military transport has a maximum Mach number of .72 using 8-blade turboprop engines. With this aircraft, noise and passenger comfort are no major issues, but it already comes close to the speed range of the RISE engine.
This is what I remember too (and my degree is not in aircraft propulsion either) but for comparison: The Airbus A400M military transport has a maximum Mach number of .72 using 8-blade turboprop engines. With this aircraft, noise and passenger comfort are no major issues, but it already comes close to the speed range of the RISE engine.
If you want to know if Airbus hides things, go to Norway in about 2013.
Just don't work on an offshore rig.
Just don't work on an offshore rig.
Presume this is what you refer to Lone
https://en.wikipedia.org/wiki/CHC_He...ice_Flight_241
And another of similar variety, all much discussed in Rotorheads as you would expect.
https://en.wikipedia.org/wiki/Bond_O...ers_Flight_85N
https://en.wikipedia.org/wiki/CHC_He...ice_Flight_241
And another of similar variety, all much discussed in Rotorheads as you would expect.
https://en.wikipedia.org/wiki/Bond_O...ers_Flight_85N
Moon landings were faked and the earth is flat too right?
BLUF:
Spoiler