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Fastest Comercial Jet

Thu Mar 28, 2002 10:14 am

What would be the fastest comercial jet at the moment.
 
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ATA L1011
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 10:16 am

Concorde
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 10:19 am

Sorry anything but supersonic jets.
 
KAUSpilot
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 10:22 am

I think the 747's and old DC-8's cruise the fastest.
 
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ATA L1011
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 10:26 am

L-1011's,747's and DC-8's. Ihave old timetables and these 3 consistently covered rte's in shorter time than when other aircraft flew the same rte's.
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zeus01
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 10:32 am

Id put money on it that newer jets can go muchhhhhhhh faster, but it isn't economical for 747 to operate at over 565 mph, which i belive is mach .81
 
Hurricane
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 10:35 am

From the Boeing website: the 747 continues to be the world's fastest subsonic jetliner, cruising at Mach .85 -- or 85 percent of the speed of sound
 
dripstick
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 10:37 am

I don't know about that Zeus01.

The older jets I think were quite fast, such as the DC-8, even the B727.

Big turbo-fan engines on fat-bodied jets create a good amount of drag.

I could be wrong though.
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EA CO AS
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 10:44 am

Speaking of subsonic jets, the fastest are:

Business jets: Cessna Citation X M0.92 cruise

Commercial jets: Boeing 747-400 M0.855 cruise
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timz
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 11:20 am

I suspect if you compare 747 schedules with DC-8/707s that were flying the same route at the same time the 747 will usually be at least as fast. Maybe the old jets could cruise at 0.84-0.86, but they usually didn't.
 
IMissPiedmont
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 11:24 am

The 747 is still the fastest. The hump actually produces lifr which reduces drag. The Convair 990 was faster, the DC-8 could not keep up with the 747 with a full load.
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YoungDon
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 11:34 am

The CV-880's and 990's were the fastest, also the Hawker Siddeley Trident, then probably the DC8's or 727's.
 
NWA742
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 11:40 am

Zeus01,

Actually the 747 cruises very economically at MO.85, that is it's designed cruise speed.
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sleekjet
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 11:41 am

Is there a solid reason why we are stuck in the 500-600 mph range? Is this a mythical barrier (like the 4-minute mile) or an engineering barrier or an economic barrier?
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artsyman
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 12:05 pm

Is there a solid reason why we are stuck in the 500-600 mph range? Is this a mythical barrier (like the 4-minute mile) or an engineering barrier or an economic barrier?

I am not sure about this, the last few flights I took across the pond in a C0 777 were 703 mph for a lot of the flight, although I am sure the winds helped

Jer
 
milesrich
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 12:48 pm

The 707 and 720 were faster than the DC-8's. In fact, Pan Am pilots who flew both referred to the Eight as the DC-Late. The 990 never lived up to its projected cruising speed.
 
high_flyr69
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RE: Fastest Comercial Jet

Thu Mar 28, 2002 1:30 pm

hey peeps i just checked it up in a book the fastes is the 727 (964kms)then the Ilyushin 86(950kms) then the MD-11(930kms)
hope that answers all ur question i think it goes to show back then things were made for speed Big grin:D:D:D:D
thats why the MD-11 is my favourite Big grin
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Konstantinos
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 4:04 am

The TU-154

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Hurricane
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 4:13 am

All I can say is, is that the Boeing website doesn't lie. I'll say it again: (From Boeing.com) "the 747 continues to be the world's fastest subsonic jetliner, cruising at Mach .85 -- or 85 percent of the speed of sound," which means it is faster than any commercial aircraft in service today, which includes the TU-154, the MD-11, the 727, and the IL-86, not to mention DC-8s still in cargo operation...
 
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 4:20 am

The A380 would be faster @0.89 Mach than the 747.
 
dutchjet
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 4:26 am

Fastest jet at the moment........747-400. The A380 is not yet in service nor has it flown.

What is interesting is that with the introduction of long-range twins, flights actually got longer! The introduction of the 767 and A310 (replacing older widebodies) on trasatlantic flights added 30 to 60 minutes of flying time depending on the route.
 
hartsfieldboy
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 5:25 am

>>Is there a solid reason why we are stuck in the 500-600 mph range? Is this a mythical barrier (like the 4-minute mile) or an engineering barrier or an economic barrier?<<

Four words: Sonic, Boom, People, Bitching

 
mandargb
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 5:43 am

Okey look the data on this .net

Max Cruising Speed

707-120B: 545 Kts

747-SP: 540 Kts

DC-8-60: 521 Kts

 
woodsboy
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 5:44 am

I think part of why older jets were faster, especially the first generation 707s, DC-8s, 727s, VC-10s etc.....was because of the engines. Those old military derived turbojets were made for speed and the early turbofans with their low/no bypass ratio made them quite fast as well. New high bypass ration turbofans are extremely economical in comparison to turbojets and 1st generation turbofans but they are not efficient to operate at higher speeds due to their high by-pass ratio of air that does not pass through the combusion chanber. Perhaps I should not say "not efficient at high speeds", rather, the faster you go, you need less air bypassing the combustion chamber and those big mouthed engines on 777s (and others) just arent designed for super fast cruise, they are designed for super economical cruise.

We have to remember that a DC-8 was the only subsonic commercial airliner to officially reach a bit beyond mach-1 in a shallow dive back in the 70s. I would guess that the "Vomic Comet" that the USAF and Nasa uses for weightless training may reach mach-1 during their dives????

Another interesting thing to point out is to compare the performance of a 767-200/300ER Transatlantic with a headwind to a tri-jet or quad. I remember in March of 2000 coming from AMS-ATL on a Delta 767-300ER, I watched out the window as just about every other airliner passed us up at different altitudes......BA 747-400, Swissair MD-11, Virgin 747-200, FedEx MD-11 while we lumbered along at something like 405mph accoring to the display, with 90kt headwinds..........adds at least an hour to the flight!
 
rj777
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Let's Race

Fri Mar 29, 2002 6:49 am

Why don't we have some planes race and find out?!
 
Racers22
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 7:04 am

The reason why we are stuck in the 500-600 mph range is because of the sonic boom. Contrary to popular belief, an object going faster than the speed of sound produces a sonic boom at all times that it is exceeding the speed of sound, not just when it first passes it. If the wavelength of the sound waves from the sonic boom happen to be at the natural frequency of any objects on the ground, those objects will most likely shatter and cause a lot of ppl to bitch.
 
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ATA L1011
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 7:24 am

Yes the twins just dont fly as fast as the 3 engined or 4 engined jets.
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777kicksass
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 7:32 am

Is it possible to exeed mach 1 ground speed but stay subsonic in comparison to the moving air? I suppose one hell of a tailwind would be required!!
 
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RayChuang
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RE: Fastest Comercial Jet

Fri Mar 29, 2002 7:42 am

Racers22,

Looks like your comment will soon be rendered obselete.  Big grin

This is because aerodynamicists have discovered a major breakthrough that revealed the sonic boom is primarily caused by the shape of the plane; certain plane shapes (e.g., the Concorde) causes a high-pressure area of air being moved around the plane that will generate a sonic boom. Indeed, Gulfstream right now is working on a Mach 1.8 business shaped so it diffuses that high-pressure zone, which reduces the sonic boom to negligible levels or even zero. And a joint US Air Force/DARPA research project working with Boeing, Lockheed Martin and Northrup Grumman have come to the same conclusions, too.

We may definitely see this new research applied to the Boeing Sonic Cruiser; imagine the final version of the Sonic Cruiser capable of flying Mach 1.6 to 1.8 with 200-225 pax at a range of 6,500 nautical miles, yet because of its shape will have no audiable sonic boom at full speed even flying over land. We're talking about the possibility of cutting LAX-NRT flight times from 12 hours to under 7 hours, or SIN-LHR in just over 10 hours even if the plane has to stop at DXB to refuel.