Astuteman, I am not trying to belittle the opportunity with the A322. What I am saying is that I think the post about not changing gear or further increasing MTOW beyond 100t would not be a good idea. Limiting changes to not include gear and MTOW would limit Airbus from getting all the opportunity out of such a redesign effort that it could.
Quoting astuteman (Reply 84):
A 757-200 length A32X would have a better rotation angle than a 737-900/9. Slightly |
We don't really know what an A322 length would be, but the original post has 48.87 meters. That's going to cause some rotation angle problems and poor takeoff performance just like the 737-900s. If you add in higher weights the airplane is going to have a fast rotation speed. You are going to have an airplane that either has a lot of extra thrust or requires 9,000ft of runway for takeoff. Airbus can address this with gear changes. If they put on a double bogie and a semi levered gear, they can help improve rotation angle.
Quoting astuteman (Reply 84): What real world range do you think the basic 737-9 MAX will have?
The 737-900ER?
The 737-900?
2000Nm sounds a bit too much like derogation to me |
The 737-900 has about 2000Nm range. Alaska Airlines was able to operate up to 2300nm with the 737-900 until the increased passenger weight guidance came out about 12 years ago, which is why they switched to the 737-800. The longest flights they currently operate it on is
SEA-
ORD, but it can probably fly 2000nm. The 900ER weight increases improved range and now the 900ER operates up to 2300nm. At this point we are talking a paper airplane with the A322. Without weight increases, gear changes etc, I think the A322 would be severely range limited. That's just my opinion of a paper plane that doesn't exist. I perceive it having some issues unless they increase takeoff weight.
There is plenty of opportunity for the A322, but I think gear changes and weight increases are going to be necessary. Otherwise the airplane is going to have poor performance which will limit sales exactly like we saw with the original 737-900. A a simple stretch, even with a redesigned wing and updated engines is still going to have some challenges. If Airbus is going to put a new wing on it, why not go all the way with upgraded gear and weights?
Quoting astuteman (Reply 84): Quoting roseflyer (Reply 80):
The A321neolr is going to be around 97t MTOW. Even with two more tons, I don't think 5000nm range is realistic
On those assumptions, I don't see why not.
New engine and wings come weight free, courtesy of c. 2t less of ACT
New engine gets 400nm or so, taking the A321 up to 4 500nm
New wing reduces drag to give another c. 200Nm
extra 2t (if possible) adds c. 300Nm
5 000nm. Nominal in every case.
We can challenge the assumptions of course
Even without the weight increase, a new engine and wings should give an A321 "ENEO" 4 600Nm - 4 700Nm easily |
The PW1100Gs together weigh 1 ton more than the IAE 2500s on the A321. The Rolls Royce engines being talked about would probably go up in weight. I am also surprised that you think that a bigger wing with more span would not weigh any more than the current wing. Even with composite structure, if they increase the span 5 meters, I would be shocked if weight did not go up. You also are suggesting that this weight would be offset by additional wing volume for fuel so that the aux tanks are not needed, yet you suggest keeping the aux tanks to get more range. Again I don't know how an A321neoLR is going to get to 5000nm range without MTOW increases. You are really stretching it there and even with that are ignoring my word "realistic" since those numbers would just be a catalog brochure range and nothing close to realistic operating range. No one has even ever tried to fly an A330-300 on a 5000nm route nonstop. 5000nm is totally unrealistic without further MTOW increases.
[Edited 2016-03-28 08:09:27]