trvyyz
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Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 11:30 am

After reading through the threads on 747,myself being a great fan of the 747 and today seeing the rare LH's 744 at YYZ, inspired me to start this thread on one of the parameters that even the modern a/c's have not surpassed.

The speed specification of the 747 is greater than the 777's, eventhough I know that they can fly faster than the specified speeds.
I believe Airbus don't even come close.
 
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Starlionblue
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 11:36 am

Yes it is. The Citation X is the fastest executive jet.
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ACDC8
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 12:23 pm

As far as I know, the 747 has always been the fastest subsonic airliner. I read once that its average cruise speed was higher then others (I believe mach 0.84, but I'm not sure about the number).
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PhilSquares
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 12:40 pm

The 400 is the fastest commercial aircraft in use to day. The pax version is .855/.86.
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aerobalance
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 12:46 pm

Not too bad for 35 year old technology that 'A' keeps pissing on........
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AWspicious
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RE: Isn't B747 The Fastest Commercial Airliner Tod

Sun Mar 27, 2005 12:53 pm

Quoting TRVYYZ (Thread starter):
After reading through the threads on 747,myself being a great fan of the 747 and today seeing the rare LH's 744 at YYZ, inspired me to start this thread on one of the parameters that even the modern a/c's have not surpassed.

On the other end of the spectrum is the Austrian A340 that made such a shallow and gentle climb out from 23 (heh heh)

I'm wondering if today's LH 744 into YYZ was the first one for the season. Bit of an eye-opener when we spotted it sitting at the infield terminal.
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SpinalTap
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 1:21 pm

The Convair 880/990 was the fastest subsonic at 0.87 mach cruising. The last commercial flight of the type was in 1987 and there are none currently in a flying condition although there appears to be some efforts to restore one - www.convairjet.com
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DfwRevolution
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 1:35 pm

Quoting PhilSquares (Reply 3):
The 400 is the fastest commercial aircraft in use to day. The pax version is .855/.86.

Just a sidenote, if the ADV becomes a reality, improved aerodynamic tweaks will see the 747 cruising slightly faster...  Smile

Quoting TRVYYZ (Thread starter):
The speed specification of the 747 is greater than the 777's, eventhough I know that they can fly faster than the specified speeds.
I believe Airbus don't even come close.

The A330/A340 cruise at Mach .82
The A340-500/600 cruise at Mach .83
The A380-800 will cruise at Mach .850

The 777 variants cruise at Mach .84
The 787 will cruise at Mach .850
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trvyyz
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 1:43 pm

Quoting AWspicious (Reply 5):
Austrian A340 that made such a shallow and gentle climb out from 23

In my recent trip I flew 2 aircrafts successively
1. AC 333 YYZ-LHR and
2. KU 772 LHR-KWI

The climb of the 333 made me think " Is this much power/thrust enough to take-off, are you serious?". It was a slow and feeble climb. But the F/A was excellent(young and beautiful, of course) and didn't expect her to speak such good French( I didn't understand a word) because her English was perfect. I wouldn't mind the slow climb at all, if were to see her again.It was the C-GHKR.

Sorry, I got a bit carried away. The climb of the KU777 from LHR made me feel proud, " that's like a man". May be the 333 is just a beautiful delicate girl. But both the climbs were completely different.

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But nothing comes close to the take-off of a 744, I remember the last time on my AMS-YYZ flight on KL in 2002, as we rotated, the angle was becoming steeper and steeper, my heart was almost coming out of my mouth as if I wanted to tell the pilot" okay that's enough, we better take off from the ground before the tail strikes". The sound and power of the 744 is simply amazing, I wonder if I will be able to fly on a 744 again.
 
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 1:48 pm

Quoting TRVYYZ (Reply 8):
The climb of the 333 made me think " Is this much power/thrust enough to take-off, are you serious?".

Are you serious? Almost everytime I've taken off in a A330, it was pretty impressive. There were a couple of times leaving YVR for DUS we could have made the space shuttle blush! WOW!  up   up   up 
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trvyyz
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 1:59 pm

Quoting ACDC8 (Reply 9):
Are you serious? Almost everytime I've taken off in a A330, it was pretty impressive

It must be because, I have flown only on heavies and long routes. The flights I flew before and after this 333 were a 744 and 777. I guess, it all depend on the weight to thrust ratio etc. A 333 is a big a/c and more aerodynamic drag would be there even if you compare with a 767. In my return flight from LHR-YYZ the climb of the AC's 763 was not bad at all, but we had some old school teachers as the F/A's, so I could sleep well compared to my previous YYZ-LHR flight.
 
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 2:08 pm

Quoting DfwRevolution (Reply 7):

Just a sidenote, if the ADV becomes a reality, improved aerodynamic tweaks will see the 747 cruising slightly faster...

DfwRevolution, as much as I would like to agree with you, the larger diameter engines will drive the maximum speed DOWN, not up. Recall that the trade is to reduce engine exhaust velocity as a small sacrifice to get cruise efficiency. I expect the 747Adv to drop to the 777's cruise Mach # of 0.84

Lightsaber
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ACDC8
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 2:08 pm

Quoting TRVYYZ (Reply 10):
some old school teachers as the F/A's, so I could sleep well compared to my previous YYZ-LHR flight.

The F/A on your YYZ-LHR flight, was she blonde or brunette?  Smile
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yyz717
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 2:10 pm

Quoting TRVYYZ (Reply 8):
The climb of the 333 made me think " Is this much power/thrust enough to take-off, are you serious?".

Are you serious? It's ridiculous to compare the take-off performance of different types based on anecdotal experiences as a passenger. Take off performance is heavily affected by air temperature, payload, fuel load, airport altitude. I've had a light AC 744 YUL-YYZ flight take off like a rocket (as you would expect) while a full loaded NW 744 LAX-SYD flight lumber into the air like a tired old DC-3 (again, as you would expect).

As for cruise speed, while the 744 is mach-hundredths faster, the average passenger will not even notice perhaps the 1-3% shorter flight time. Its unfortunate the Sonic Cruiser was canned -- a .95 mach speed would have cut cruise times by 15% or so, enough for most passengers to notice and enough for many to actually opt for if flight time is a factor.
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trvyyz
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 2:17 pm

Quoting ACDC8 (Reply 12):
The F/A on your YYZ-LHR flight, was she blonde or brunette?

O God!, I still remember her face, but not her hair. I wish I was single.
From what I remember, she does not seem to be a blonde, so she should be a brunette. But she was young, beautiful, kind and kind of shy. She was a bit shy to face the people after her French announcement.
Do English speaking Canadians speak good and fluent French? I guess she should be French then, but her English was perfect Canadian style.

Hope to see her some day.
 
trvyyz
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 2:23 pm

Quoting Yyz717 (Reply 13):
Are you serious? It's ridiculous to compare the take-off performance of different types based on anecdotal experiences as a passenger. Take off performance is heavily affected by air temperature, payload, fuel load, airport altitude.

I wish I had studied Aeronautical Engineering instead of Electrical. My comments are exactly as you have described. I would be glad if you could give some figures or numbers. As I said, I flew the A333 after flying a 744, so that could be the reason.
 
LHB727230Adv
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 2:41 pm

The 727 is faster than the 747, it's maximum speed is at about 1020km/h, don't know what Mach # that is. Too bad there's not that many left flying.
 
bayareapilot
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 2:43 pm

Quoting Yyz717 (Reply 13):
Its unfortunate the Sonic Cruiser was canned -- a .95 mach speed would have cut cruise times by 15% or so, enough for most passengers to notice and enough for many to actually opt for if flight time is a factor.

Agreed. The Sonic Cruiser is a much more exciting concept than either the A380 or 787. I'm surprised airlines determined that while premium passengers are willing to pay thousands more for a bigger seat and better meals in business class, they are not willing to pay more to save hours on a long-haul flight.
 
trvyyz
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 3:00 pm

727 Specs from Boeing

747-400 Specs from Boeing

777Specs from Boeing

Isn't this faster than all of the above. If I remember correctly we hit slightly over 980Kmph.
 
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yyz717
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 3:09 pm

Quoting BayAreaPilot (Reply 17):
Quoting Yyz717 (Reply 13):
Its unfortunate the Sonic Cruiser was canned -- a .95 mach speed would have cut cruise times by 15% or so, enough for most passengers to notice and enough for many to actually opt for if flight time is a factor.

Agreed. The Sonic Cruiser is a much more exciting concept than either the A380 or 787. I'm surprised airlines determined that while premium passengers are willing to pay thousands more for a bigger seat and better meals in business class, they are not willing to pay more to save hours on a long-haul flight.

The Sonic Cruiser had active airline interest until 9-11 if memory serves. If/when business travel yields climb again, I'm sure it will be resurrected in one form or another.
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Stealthz
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 5:36 pm

Quoting TRVYYZ (Reply 18):
Isn't this faster than all of the above. If I remember correctly we hit slightly over 980Kmph.

Yes it is, but may have little relationship to airspeed, if that plane was flying in a 150km jetstream tailwind the airspeed would be a very economical 820Kmph.

Many years ago I virtually commuted between SYD & PER mostly on Ansett A320, one Friday night we hitched onto a Eastbound jetstream of almost 250kmph, the Captain made a special announcement as he thought, rightly so I expect, that few on board had travelled at over 1000kmph. No one complained about arriving home in SYD over an hour early after a hard work week either
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COAMiG29
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 5:47 pm

The max speed of a 744 according to the db is 934 km/h while the max speed of a TU-154 is 973 or somthing like that. if you are saying economical crusing speed you are correct however the fastest commercial plane though currently not in active service is the TU-144 which i beleive is slightly faster than the concorde. please correct me if im wrong

the 744 is a great plane. ive never been on a 747 before Sad where can i get a flight on one and return the same day for cheep i just want to be on a 747.

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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 5:49 pm

Quoting SpinalTap (Reply 6):
The last commercial flight of the type was in 1987

I'm just curious, was this operated by Spantax?

Also, does anyone have the website address which (unofficially) lists the speed records by type? Pilots who think they have the record take a picture of the FMC which "proves" that they were going the specified velocity. I'm assuming this operated on the honor system since some records do not come with a photo. Thanks
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lehpron
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 5:57 pm

Quoting DfwRevolution (Reply 7):
The A330/A340 cruise at Mach .82
The A340-500/600 cruise at Mach .83
The A380-800 will cruise at Mach .850

The 777 variants cruise at Mach .84
The 787 will cruise at Mach .850

The speed of sounds varies by temperature, and so does density through viscosity which also varies with temperature. It is the square root of the ratio of specific heats for air times the gas constant for air times the the air temperature, or a = (1.4*278*T)1/2.

If the temperature randomly fluctuated from different regions of airmasses, your Mach # will also vary even if your speed des not.

So what is the mph/kmph cruise of these aircraft, not including wind?
The meaning of life is curiosity; we were put on this planet to explore opportunities.
 
COAMiG29
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Sun Mar 27, 2005 5:58 pm

look up a few posts i posted some and also check the db
If Continental had a hub at DFW with nonstop flights I would always fly them, unfortunantely good things take time.
 
cancidas
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 12:35 am

isn't john travolta rumored to have purchaed a convair to restore for himself? i can't remmber if it was a 880 or a 990 that i heard about. i just hope it's true...
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NceBoy
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 12:43 am

I can remember on a 332 flight that the PTV showed a speed over 1000 km for the entire cruise (due to very strong wings). That was just fun !
coz I'm leaving on a jetplane !
 
ACDC8
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 12:49 am

I flew on a KLM 747-300 from YVR-AMS via YYC back in 1995, and we had a ground speed of 1127 km/h! That was one hell of a tailwind, nice and bumpy too!  bouncy 
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dw747400
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 12:57 am

Lehpron,

"So what is the mph/kmph cruise of these aircraft, not including wind?"

Generally the big jets hold a mach number... the exact mph cruise would be determined by the various conditions you mentioned.

"DfwRevolution, as much as I would like to agree with you, the larger diameter engines will drive the maximum speed DOWN, not up."

Correct me if I'm wrong, but assuming the F=MA, then a slightly slower exit velocity is not significant as long as the engine is moving more air. Boeing has already said they expect a 747ADV to cruise at .86 or better.
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socal
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 1:02 am

The 727 is the fastest airliner now, over 600++ MPH.
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N1120A
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 1:02 am

Quoting ACDC8 (Reply 2):
As far as I know, the 747 has always been the fastest subsonic airliner. I read once that its average cruise speed was higher then others (I believe mach 0.84, but I'm not sure about the number).

.855 for the 744, .85 for the 747Classics

Quoting TRVYYZ (Reply 8):
The climb of the 333 made me think " Is this much power/thrust enough to take-off, are you serious?".

The take off power for the A330 is not at all an issue, it is that of the A340

Quoting Lightsaber (Reply 11):
as much as I would like to agree with you, the larger diameter engines will drive the maximum speed DOWN, not up. Recall that the trade is to reduce engine exhaust velocity as a small sacrifice to get cruise efficiency. I expect the 747Adv to drop to the 777's cruise Mach # of 0.84

Boeing has already stated that the 747ADV will be faster, not slower, than the 744, with half a mach number improvement to M.86

Quoting LHB727230Adv (Reply 16):
The 727 is faster than the 747, it's maximum speed is at about 1020km/h, don't know what Mach # that is. Too bad there's not that many left flying.

The 747 (along with some other airliners) has broken the sound barrier in a shallow dive, but that does not mean it is typical. You can fly 744s around all day faster than any other commercial aircraft, but will burn too much fuel. The economical cruise speed of the 747 is higher than any other currently flying commercial aircraft.

Quoting TRVYYZ (Reply 18):
Isn't this faster than all of the above. If I remember correctly we hit slightly over 980Kmph.

Nice tail wind

Quoting COAMiG29 (Reply 21):
The max speed of a 744 according to the db is 934 km/h while the max speed of a TU-154 is 973 or somthing like that.

If that is the A.net database, you are starting off on the wrong foot buddy.
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DfwRevolution
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 1:14 am

Quoting Lehpron (Reply 23):
If the temperature randomly fluctuated from different regions of airmasses, your Mach # will also vary even if your speed des not.

So what is the mph/kmph cruise of these aircraft, not including wind?

Damn if I know, they are simply the Mach numbers that the respective manufacture tailored the aircraft to cruise at.

Quoting Lightsaber (Reply 11):
DfwRevolution, as much as I would like to agree with you, the larger diameter engines will drive the maximum speed DOWN, not up.

I'm just relaying Boeing's marketing, and it just that (marketing)-

http://www.boeing.com/randy/pdf/747AdvCard.pdf
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md11dude
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 2:13 am

You guys are forgetting about the MD-11, I was under the impression it was easily just as fast as 744.
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persotvik
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 2:30 am

The MD11 is faster as far as I know. TG which operate both the B744 and the M11 on the ZRH-BKK run schedule the route with shorter flighttime with the M11.
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socal
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 3:40 am

The MD-11 is faster than a 747, but still not faster than the 727.
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Tubs1275
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 4:08 am

Hi,

My first post so be gentle!!

How about the Vickers Super VC10 with a top speed of 0.88 mach....pity only the RAF fly them now days.

Cheers,

Tubs
 
trvyyz
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 4:27 am

Quoting AWspicious (Reply 5):
I'm wondering if today's LH 744 into YYZ was the first one for the season

I guess you're right, flytecomm shows a 744 for today's LH.
 
ACYWG
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 4:30 am

the most rocket-like take-off I've ever had in a AC A333 was one of the short hops they use them on from YUL to YYZ. Light passenger load that day and very light fuel for the hour long jaunt. It felt like we were going straight up!
 
mconway
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 4:32 am

I've worked lots of 744's at M.88 on the Atlantic crossing. This normally occurs during winter months when the outside air temperature is in the low minus 70 degree range. At these temps the fuel starts to gel and the aircraft, if they are unable to get a lower flight level, will generally speed up in an attempt to create more friction and increase the fuel temps. I've had more than one aircraft declare an emergency because of low fuel temps. If I'm not mistaken I've also had a few 744's at M.89 because of this same reason but could not swear to that.

Regards.
 
eilennaei
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 4:36 am

The following link has a Java Applet that's supposed to calculate the mach number in different circumstances.

http://www.grc.nasa.gov/WWW/K-12/airplane/mach.html

I think the difference between a typical (economical) cruise speed and the max speed should be kept in mind.
 
trvyyz
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 4:45 am

Quoting Mconway (Reply 38):

Like I had mentioned before the planes fly at higher speeds than the specified speeds mentioned by Boeing, because they specify the speed as normal cruising speed for a particular altitude(could be the speed for best fuel economy). But rarely is the max. speed specified.

So, the fastest would be, the fastest recorded, because we can debate on the temp, wind speed etc. So, which commercial a/c (exclude concorde please!), flew the fastest, that would make some sense.
 
jdwfloyd
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 4:48 am

I've heard stories of a US 722 breaking 600 kts indicated on app to BDA, not sure if it's true or not.
 
Luniew
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 6:05 am

Once I flew 767-200 with LOT from EWR-WAW we departed 1hr 20 minutes late, Over Atlantic we got some good tail winds, the speed was shown to be 1020kmph I even remember F/A asking another F/A when she looked at the map if we are going really that fast. We arrived at okecie 2 minutes late which made our flight about 7hr and 18minutes.
 
pr1268
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RE: Isn't B747 The Fastest Commercial Airliner Tod

Mon Mar 28, 2005 6:20 am

B744 - normal operational Mach is 0.85. MMO = 0.899. A 744 pilot I know mentioned that the overspeed horn sounds at any speed above 0.90.

There was a discussion in Flying, Airways, or Airliners magazine (I can't remember which) from readers' letters regarding the fastest subsonic airliner. One reader, a seasoned DL pilot, mentioned that although the B747 ordinarily operated at 0.83-0.85, the L1011 did 0.84-0.86 regularly. The reader further mentioned that the L1011 could be pushed to 0.90 (!) in a pinch, where it would guzzle fuel like "nobody's business" and "...you could feel a hint of Mach buffet."

I read in a book years ago that although the B747 was originally developed for 0.88 cruise, it never regularly achieved this due to outrageous fuel costs. The 744 can get and additional 0.01 Mach (0.85 vs. 0.84) over the 747-{100/200/300} due to the aerodynamic efficiency improvement with winglets, wing root fairings, longer upper deck, etc (thanks to Airways Magazine for that info).

The magazine article (and reader mail) also mentioned that the Convair CV990 was designed for 0.91 cruise, but alas, it never really accomplished that either. One reader mentioned that Northeast Airlines was going to service their JFK-MIA route in the 1960's with a CV990 doing Mach 0.94!

UPDATE: Cool article at Wikipedia.org on the CV990 - http://en.wikipedia.org/wiki/Convair_990

[Edited 2005-03-27 22:31:20]
The only time an aircraft has too much fuel is when it is on fire.
 
ACYWG
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 6:43 am

wasn't there a story recently about this type of thing on here, about the 747SP that broke the sound barrier in a dive and now flys kind wonky cause the wings are bent from the airspeed?
 
Luniew
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 7:06 am

Will the overspeed sound go off if lets say your flying Mach .99 with tail winds?
And how does the speed shows? I guess on GPS as ground speed. And the regular speedometer will show just the speed without tailwinds?
 
UA772IAD
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 7:14 am

What were to happen if the captain of a 744, set his airspeed to .87 mach? I know the FMC computes the best, most "economical" airspeed, but again, is that possible?
 
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 7:16 am

Quoting Luniew (Reply 45):
Will the overspeed sound go off if lets say your flying Mach .99 with tail winds?

If it's .99 airspeed yes, if it's .99 ground speed no. Overspeed is only a factor of airspeed since ground speed has no aerodynamic effect on the aircraft.

Quoting Luniew (Reply 45):
And how does the speed shows? I guess on GPS as ground speed. And the regular speedometer will show just the speed without tailwinds?

Airspeed= Speed relative to the surrounding air.
Ground Speed = Speed relative to the ground.

In simple terms, ground speed is airspeed plus the tail or headwind component. So if you are at x airspeed, and you have y tailwind component, your ground speed is x+y. If you are at x airspeed, and you have -y headwind componend, your ground speed is x-y.

Ground speed is calculated with inputs from the GPS and/or inertial navigation platform. Airspeed is calculated with inputs from the pitot/static system.

In aerodynamic terms, airspeed is the only one that counts. In navigation and traffic terms, ground speed is also important.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
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Starlionblue
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RE: Isn't B747 The Fastest Commercial Airliner Tod

Mon Mar 28, 2005 7:17 am

Quoting UA772IAD (Reply 47):
What were to happen if the captain of a 744, set his airspeed to .87 mach? I know the FMC computes the best, most "economical" airspeed, but again, is that possible?

The plane would accelerate to .87 mach.

[Edited 2005-03-27 23:18:01]
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
UA772IAD
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RE: Isn't B747 The Fastest Commercial Airliner Today?

Mon Mar 28, 2005 7:25 am

I thought so, but is it just not as cost effective to do that? For example, if a flight was going DEN-IAD, and due to the W-E direction, there will be mild to strong tail winds, so why not take the 777/747, etc. up to mach .86?
I guess what I want to know, is why isn't that a more common practice?

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