cx251
Posts: 49
Joined: Mon Sep 01, 2003 3:34 pm

Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 4:46 pm

What's the fastest speed you've ever travelled on any subsonic civil aircraft?

Mine is 1190km/h on B747-400 eastbound to HKG in China Airspace.
 
D-aqui
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Joined: Wed Sep 26, 2001 7:16 pm

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 5:48 pm

@Cx251

That must have been speed over ground, otherwise that particular a/c you have been on must have gone supersonic at cruising altitude.

As I assume that you had the reading from the PTV's your flight must have had a considerable tailwind.

Regards

D-AQUI
 
cx251
Posts: 49
Joined: Mon Sep 01, 2003 3:34 pm

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 5:56 pm

D-AQUI

You're right. I've forgotten the tailwind speed at that point (something close to 200km/h) and that piece of info was indeed from the PTV. Believe it or not, the usual 11.5 hours flight from LHR took us just 11 hours. The speed over ground was over 1000km/h for most of the journey anyway.

CX251
 
AJ
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Joined: Wed Nov 03, 1999 3:54 pm

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 5:56 pm

The fastest airspeed I've been was Mach 0.9 in a Boeing 747-400.

Groundspeed wise this photo has me doing 1126km/h (608kts):
 
POSITIVE RATE
Posts: 2121
Joined: Sun Sep 16, 2001 11:31 am

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 6:02 pm

My quickest was 1050km/h in a QF 767-300ER ADL-SYD. SYD-HNL on a 747-400 we averaged around 1,000km/h GS.
 
StarFlyer
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Joined: Thu Sep 12, 2002 10:07 am

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 6:11 pm

1250 km/h on Singapore Airlines Boeing 747-400 9V-SPI over easter Australia enroute Singapore to Auckland.
Yours truly - StarFlyer
 
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solnabo
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RE: Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 7:45 pm

1100 km/h on Premiair DC10-30....
Airbus SAS - Love them both
 
bobnwa
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Joined: Fri Dec 22, 2000 12:10 am

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 8:47 pm

Cx251,

Are you asking about Air Speed or Ground Speed. Your heading says air but in the article it is ground. They are two entirely different things.
 
QF747
Posts: 157
Joined: Sat Nov 27, 1999 9:53 am

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 9:06 pm

Mine was on Air New Zealand 744 LAX-SYD, it 1250 km/h. There were problems with seat assignments, so everyone had to be deplaned and reassigned seats. Delayed about two hours and made it all up inflight.
Always fly QF!
 
UN_B732
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Joined: Wed Jul 04, 2001 12:57 am

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Mon Sep 01, 2003 9:11 pm

Mine was like 975km/h to 1,025 km/h on an Aeroflot 777.....That thing went really fast across the pond.
Left a little late, got in right on time. I think.
-UN
What now?
 
broke
Posts: 1299
Joined: Wed Apr 24, 2002 8:04 pm

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 12:09 am

Jet powered airliners fly using a Mach Number as their targeted cruising speed.
Since the speed of sound varies according to air temperature, the air speed for a certain Mach Number will also vary according to air temperature. The higher the air temperature, the faster the speed of sound.
On a standard day, the speed of sound at sea level is about 761 mph or 661 kts.
At 35,000' or about 10,700 m, the speed of sound is about 650 mph or 576 kts.

So when you are trying to determine your true air speed for a certain Mach Number, it's nice to have an air data computer to help you out.

Ground speed, of course, is dependent on the winds aloft in addition to you cruising Mach Number. One of the funnier things I have ever seen is a Piper Cub going backwards over the ground on a very windy day while trying to land.
 
cx251
Posts: 49
Joined: Mon Sep 01, 2003 3:34 pm

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 12:11 am

Bobnwa,

I do apologise here for the confusing title. I suppose i meant ground speed here but of course you can also quote the air speed as well.
 
La Carlota
Posts: 336
Joined: Fri Jun 01, 2001 9:17 pm

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 12:21 am

Sorry for the question, but does that means that if your subsonic flight reaches, let's say, around 1,000 km/h, (and of course depending on the air temperature someone mentioned above, and the altitude)... you are technically flying supersonic???
I've always asked myself that...
Tango Tango Fox
 
MD88Captain
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Joined: Wed Nov 14, 2001 9:50 am

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 12:54 am

.9M twice. Both times were on a L1011.
 
B2707SST
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RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 1:36 am

La Carlota:

1,000 km/h works out to about 620 miles per hour, or a Mach number of .94 at standard stratospheric temperatures, so you'd still be subsonic. But using 1,500 km/h an an example, unless you reach 1,500 km/h groundspeed without a substantial tailwind, thus breaking the sounds barrier "on your own," you're still subsonic. Mach number is calculated relative to the airstream, so headwinds/tailwinds have no effect (leaving temperature changes aside).

--B2707SST
Keynes is dead and we are living in his long run.
 
richierich
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Joined: Sat Nov 04, 2000 5:49 am

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 1:40 am

I don't know the exact speed, but I made JFK-MAN in 5 hours 10 minutes one winter trip on a BA 767. That was pretty darn fast!
None shall pass!!!!
 
ybacpa
Posts: 1080
Joined: Thu Mar 01, 2001 5:39 am

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 2:04 am

790 MPH on a VS 742 while travelling from Newark to London almost 2 years ago. The flight only took about 5 hours, the return flight a week later took over 9.
SkyTeam: The alliance for third rate airlines finally getting their act together!
 
citationjet
Posts: 2251
Joined: Sun Mar 09, 2003 2:26 am

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 2:14 am

Once the Concorde's are grounded, the fastest civil aircraft will be the Cessna Citation X business jet. Its Mmo = 0.92, and it routinely can fly at that speed. It is certified to 51,000 ft.
Boeing Flown: 701,702,703;717;720;721,722;731,732,733,734,735,737,738,739;741,742,743,744,747SP;752,753;762,763;772,773.
 
SSTjumbo
Posts: 2579
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RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 3:39 am

I believe the Citation X also broke the sound barrier during testing. Can someone verify me on that?
I don't know, so this is my signature.
 
airplanetire
Posts: 1783
Joined: Sun May 13, 2001 11:59 pm

RE: Fastest AirSpeed On Subsonic Civil Aircraft

Tue Sep 02, 2003 7:39 am

My fastest was on a Delta 777 in the beginning of July flying from ATL to FCO. The fastest I remember seeing on the PTV was 688 mph (1107 km/hr). It wasn't that fast the whole time though because if it had been, we'd have been there at least an hour faster. The flight took 8 hours 39 minutes.

-Airplanetire

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