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Fastest AirSpeed On Subsonic Civil Aircraft  
User currently offlineCx251 From Hong Kong, joined Sep 2003, 52 posts, RR: 0
Posted (11 years 3 weeks 16 hours ago) and read 3933 times:

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.

19 replies: All unread, jump to last
 
User currently offlineD-aqui From Germany, joined Sep 2001, 203 posts, RR: 8
Reply 1, posted (11 years 3 weeks 15 hours ago) and read 3877 times:

@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


User currently offlineCx251 From Hong Kong, joined Sep 2003, 52 posts, RR: 0
Reply 2, posted (11 years 3 weeks 14 hours ago) and read 3852 times:

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


User currently offlineAJ From Australia, joined Nov 1999, 2391 posts, RR: 24
Reply 3, posted (11 years 3 weeks 14 hours ago) and read 3846 times:

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):


User currently offlinePositive rate From Australia, joined Sep 2001, 2143 posts, RR: 1
Reply 4, posted (11 years 3 weeks 14 hours ago) and read 3835 times:

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.

User currently offlineStarFlyer From Germany, joined Sep 2002, 987 posts, RR: 1
Reply 5, posted (11 years 3 weeks 14 hours ago) and read 3812 times:

1250 km/h on Singapore Airlines Boeing 747-400 9V-SPI over easter Australia enroute Singapore to Auckland.


Yours truly - StarFlyer
User currently offlineSolnabo From Sweden, joined Jan 2008, 852 posts, RR: 2
Reply 6, posted (11 years 3 weeks 13 hours ago) and read 3757 times:

1100 km/h on Premiair DC10-30....


Airbus SAS - Love them both
User currently offlineBobnwa From United States of America, joined Dec 2000, 6471 posts, RR: 9
Reply 7, posted (11 years 3 weeks 12 hours ago) and read 3711 times:

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.


User currently offlineQF747 From Australia, joined Nov 1999, 164 posts, RR: 0
Reply 8, posted (11 years 3 weeks 11 hours ago) and read 3682 times:

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!
User currently offlineUN_B732 From United States of America, joined Jul 2001, 4289 posts, RR: 4
Reply 9, posted (11 years 3 weeks 11 hours ago) and read 3670 times:

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?
User currently offlineBroke From United States of America, joined Apr 2002, 1322 posts, RR: 3
Reply 10, posted (11 years 3 weeks 8 hours ago) and read 3547 times:

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.


User currently offlineCx251 From Hong Kong, joined Sep 2003, 52 posts, RR: 0
Reply 11, posted (11 years 3 weeks 8 hours ago) and read 3547 times:

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.


User currently offlineLa Carlota From United States of America, joined Jun 2001, 358 posts, RR: 0
Reply 12, posted (11 years 3 weeks 8 hours ago) and read 3497 times:

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
User currently offlineMD88Captain From United States of America, joined Nov 2001, 1330 posts, RR: 20
Reply 13, posted (11 years 3 weeks 7 hours ago) and read 3466 times:

.9M twice. Both times were on a L1011.

User currently offlineB2707SST From United States of America, joined Apr 2003, 1369 posts, RR: 59
Reply 14, posted (11 years 3 weeks 7 hours ago) and read 3398 times:

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.
User currently offlineRichierich From United States of America, joined Nov 2000, 4262 posts, RR: 6
Reply 15, posted (11 years 3 weeks 7 hours ago) and read 3383 times:

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!!!!
User currently offlineYbacpa From United States of America, joined Feb 2001, 1108 posts, RR: 1
Reply 16, posted (11 years 3 weeks 6 hours ago) and read 3316 times:

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!
User currently offlineCitationJet From United States of America, joined Mar 2003, 2438 posts, RR: 3
Reply 17, posted (11 years 3 weeks 6 hours ago) and read 3293 times:

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.
User currently offlineSSTjumbo From , joined Dec 1969, posts, RR:
Reply 18, posted (11 years 3 weeks 5 hours ago) and read 3216 times:

I believe the Citation X also broke the sound barrier during testing. Can someone verify me on that?

User currently offlineAirplanetire From United States of America, joined May 2001, 1809 posts, RR: 2
Reply 19, posted (11 years 3 weeks 1 hour ago) and read 3137 times:

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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