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Post by FabienA380 on Jan 1, 2015 6:42:01 GMT 1
Airbus A350 - General Discussion (2015)  |
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mjoelnir
in service - 2 years
Posts: 4,089
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Post by mjoelnir on Jan 9, 2015 13:49:10 GMT 1
I have a question to the service ceiling of the A350. It is given as 43,100 feet. Is that according to a regulation max service ceiling for commercial aircraft, or is it the max physical save ceiling. You see some business jets going up to 51,000 feet.
Second question, does the A350 do reach its service ceiling at directly after take off with MTOW or does she has to fly some time in lower ranges until she gets a bit lighter.
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Baroque
in service - 2 years
Posts: 3,991
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Post by Baroque on Jan 9, 2015 15:45:33 GMT 1
Maybe helios91 may know something about this, having tracked the A350's flight profiles day in and day out.  I tend to think that if given the push and under the right physical conditions and aircraft weight, you can take the aircraft above the max ceiling by a couple thousand feet or so, but may not be sustainable. I don't think that the max ceiling certified is the absolute maximum it can go. A business jet is a whole different animal. Not only do some go higher than typical large airliners, they also have higher cabin pressure. |
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s543
in service - 2 years
Posts: 3,959 
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Post by s543 on Jan 9, 2015 16:06:38 GMT 1
There are a complicated questions of economy - wings size, engine trust, weight, aerodynamic losses.... and similar so what must be in order to get into the air at low height.... i.e. all the consumption consequences are not so interesting with Bizjets - the speed is the most important point. It is so expensive that few (thousand) USD for fuel does not play any role.
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sciing
in service - 1 year
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Posts: 2,503
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Post by sciing on Jan 9, 2015 16:47:50 GMT 1
I have a question to the service ceiling of the A350. It is given as 43,100 feet. Is that according to a regulation max service ceiling for commercial aircraft, or is it the max physical save ceiling. You see some business jets going up to 51,000 feet. Second question, does the A350 do reach its service ceiling at directly after take off with MTOW or does she has to fly some time in lower ranges until she gets a bit lighter. According wikipedia max service ceiling is defined as the max height of a plane still able to climb by 100ft/min. In the german version it is mentioned that this is at MTOW. At lower weight maximum will be higher. The absolute maximum is defined by the coffin corner, the mach limit for overspeed (degreasing with temperature -->height) and stall limit for underspeed (increasing with lower atmospheric pressure-->height). Please correct me if I understand this wrong. I did not study avitation, this is just the info I collect in the last months. The coffin corner is usually higher for small bjets than for passenfer jets. But I saw a video of a bjet at FL510 and they said the coffin corner space was just 30kts. |
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XWB
in service - 11 years
Posts: 16,115
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Post by XWB on Jan 9, 2015 16:51:18 GMT 1
Second question, does the A350 do reach its service ceiling at directly after take off with MTOW or does she has to fly some time in lower ranges until she gets a bit lighter. I'm not sure if that's possible for commercial jets from Airbus and Boeing. The 787 flies at FL430 but it takes awhile before it reaches that altitude. |
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mjoelnir
in service - 2 years
Posts: 4,089
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Post by mjoelnir on Jan 10, 2015 0:05:19 GMT 1
I have a question to the service ceiling of the A350. It is given as 43,100 feet. Is that according to a regulation max service ceiling for commercial aircraft, or is it the max physical save ceiling. You see some business jets going up to 51,000 feet. Second question, does the A350 do reach its service ceiling at directly after take off with MTOW or does she has to fly some time in lower ranges until she gets a bit lighter. According wikipedia max service ceiling is defined as the max height of a plane still able to climb by 100ft/min. In the german version it is mentioned that this is at MTOW. At lower weight maximum will be higher. The absolute maximum is defined by the coffin corner, the mach limit for overspeed (degreasing with temperature -->height) and stall limit for underspeed (increasing with lower atmospheric pressure-->height). Please correct me if I understand this wrong. I did not study avitation, this is just the info I collect in the last months. The coffin corner is usually higher for small bjets than for passenfer jets. But I saw a video of a bjet at FL510 and they said the coffin corner space was just 30kts. I know about those calculations, coffin corner and all that stuff. My question is to a completely different point. You go through the information and a lot of different frames have a service ceiling of 43,100 feet. Are all designers hitting with all those frames the exact same sweet spot or is some regulation rising its ugly head putting up a max permissible ceiling for commercial used passenger airplanes. That was my question. The B747-400 had a certified service ceiling of + 45,000 feet, the B747SP still higher, now one reads 43,100 feet regarding the B747-8. |
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XWB
in service - 11 years
Posts: 16,115
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Post by XWB on Jan 12, 2015 17:52:19 GMT 1
If anything, MSN6 flew at FL430 from DOH to LHR last Saturday.  |
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Post by Jkkw on Jan 13, 2015 11:01:08 GMT 1
Not many orders left for the A358 with Yemenia converting to the -900 (10 Aircraft) and Hawaiian cancelling for the A338 (6 aircraft), leaving 16 left
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philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Jan 13, 2015 15:56:30 GMT 1
I am pleased that Yemenia went for the A359, though I wonder whether this order is as firm as I would like it to be ...
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