donder10
Posts: 6944
Joined: Sun Oct 21, 2001 5:29 am

The 747SP-fastest Crusing Commercial Plane?

Sat Jun 16, 2001 4:51 pm

I was looking at the site www.worldairroutes.com and I found one route from South African Airways.On a flight from Johannesburg to Cape Town the 747SP was crusing at .871 mach@43,000 feet.IS this normal for the 747 SP?If so it must be the fastest crusing commerical jet in service surely?Thanks,Alex
 
Guest

RE: The 747SP-fastest Crusing Commercial Plane?

Sat Jun 16, 2001 5:31 pm

Concorde is faster!
Iain
 
donder10
Posts: 6944
Joined: Sun Oct 21, 2001 5:29 am

RE: The 747SP-fastest Crusing Commercial Plane?

Sat Jun 16, 2001 5:38 pm

LOL true but excluding concorde.
 
Guest

RE: The 747SP-fastest Crusing Commercial Plane?

Sat Jun 16, 2001 5:56 pm

TU-144!
Iain
 
Sonic99
Posts: 625
Joined: Sun Jun 03, 2001 8:39 am

RE: The 747SP-fastest Crusing Commercial Plane?

Sat Jun 16, 2001 5:57 pm


Donder,

Ya that's pretty quick, but is that ground speed or air speed. Second, if the pilot caught the jetstream then that plane will be cruising for sure. BTW, I was on an AF flight from YUL to CDG and the speed indicator on the cabin screen showed 1,083 kph (relative to the ground).
That was in a 747-400.

Cheers

Sonic99
 
Air NZ
Posts: 201
Joined: Sun Jun 10, 2001 11:12 am

RE: The 747SP-fastest Crusing Commercial Plane?

Sat Jun 16, 2001 6:02 pm

The fastest not supersonic would be the Boeing 727max speed 1017km/h (549kt).
 
LZ-TLT
Posts: 427
Joined: Mon Apr 23, 2001 10:34 am

RE: The 747SP-fastest Crusing Commercial Plane?

Sat Jun 16, 2001 9:53 pm

NOT the 727.

Talking about the fastest subsonic airliners out there:
Convair 880/990
Tu-154(all series)
 
Mr.BA
Posts: 3310
Joined: Sun Sep 24, 2000 12:26 pm

RE: The 747SP-fastest Crusing Commercial Plane?

Sat Jun 16, 2001 10:02 pm

I heard the B747SP can cruise at 49,000 feet at the maximum. Is it true?

Best Regards,

alvin
Boeing747 万岁!
 
N400QX
Posts: 1981
Joined: Sun May 06, 2001 9:51 am

RE: The 747SP-fastest Crusing Commercial Plane?

Sun Jun 17, 2001 2:35 am

Well, I believe the B744 barely beats the SP. The 744 can cruise at Mach .90. (I'm about 95% sure of this Big grin )
 
Guest

RE: The 747SP-fastest Crusing Commercial Plane?

Sun Jun 17, 2001 4:01 am

Actually all B747's have the same limiting MMO of 0.92, but you won't find anyone flying even close to that speed.

The cruise speed on the 744 will vary according to your cost index, but between 0.82-0.87 would be good. As for the SP, M0.85.

Max Alt for all B747's including the SP as per the AFM = 45,100 feet.
 
Ikarus
Posts: 3391
Joined: Mon Jan 08, 2001 10:18 pm

RE: The 747SP-fastest Crusing Commercial Plane?

Sun Jun 17, 2001 7:59 pm

Sonic99: If the speed is quoted as Machnumber it can only be airspeed, as the Machnumber varies with altitude!

As far as I know, cruising at M0.85 to M0.9 is nothing special - most modern jetliners do it.

Regards

Ikarus
 
Sonic99
Posts: 625
Joined: Sun Jun 03, 2001 8:39 am

RE: The 747SP-fastest Crusing Commercial Plane?

Mon Jun 18, 2001 2:03 am


Hey Ikarus,

Yeah I hear you. Look, the 744 I was on obviously caught the jetstream and that added to the ground-relative speed. I'm sure the pilot max-ed the throttles to whatever the top speed is - we left YUL nearly 2 hours late but landed in CDG early! That was a quick trip over the pond for me... actually the quickest yet, just a shade under 5.5 hrs.

Sonic
 
Guest

RE: The 747SP-fastest Crusing Commercial Plane?

Mon Jun 18, 2001 3:08 am

Iainhol: you are wrong on both posts. The Concorde and Tu-144 are not in service.
 
IMissPiedmont
Posts: 6200
Joined: Wed May 23, 2001 12:58 pm

RE:LowFareAir

Mon Jun 18, 2001 9:30 am

Give the kid a break. He was being funny. The Concorde will be back in service though.

Steve  Smile
The day you stop learning is the day you should die.
 
Guest

RE: The 747SP-fastest Crusing Commercial Plane?

Mon Jun 18, 2001 9:35 am

If you read the subject it says 'commercial planes'. Also please note some one mentioned Convairs which are also not in service, but I guess you do not know about them!
Iain
 
b757300
Posts: 3914
Joined: Fri Dec 15, 2000 10:27 pm

RE: The 747SP-fastest Crusing Commercial Plane?

Mon Jun 18, 2001 9:36 am

"There is no victory at bargain basement prices."
 
penguinflies
Posts: 932
Joined: Thu Apr 06, 2000 12:00 pm

RE: The 747SP-fastest Crusing Commercial Plane?

Mon Jun 18, 2001 12:48 pm

getting technical

If you count NetJets as a commerical operator (Part 135), the fastest plane is the Citation X.
 
cfalk
Posts: 10221
Joined: Mon Dec 04, 2000 6:38 pm

RE: The 747SP-fastest Crusing Commercial Plane?

Mon Jun 18, 2001 4:54 pm

Mach is measured by airspeed, not groundspeed, so whether the plane had caught a favorable jetstream or not is entirely irrelavant.

The SP, with much less weight and the same wing as the 747-200 and -300, could fly significantly higher and faster - the limiting factor (depending on the latitudes) was that flying as high as it could (49,000 feet was not unheard of) led to fuel icing problems, as the temperature of the fuel in the tanks dropped below -30 degrees (or is it -40) which is the freezing temperature of Jet A fuel. Normally, exterior temperature is colder than that, -50 or -60 or so, but friction of the air over the wing will warm it up slightly, bringing the fuel temperature back to operating levels.

I read an article written by a former PanAm SP pilot who described such flights quite nicely - I'll try to find the link.

Flying higher also allows you to fly faster, as there is less drag resistance.

The new Polar flights (like JFK-Hong Kong) apparently also have this fuel freezing issue to look out for, and requires extra attention during the flight over the cold polar regions.

Charles
The only thing you should feel when shooting a terrorist: Recoil.

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