Vimanav
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Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 3:32 am

I once read of a B727-100 during the course of an uncontrolled descent (more of a nose dive) actually broke the sound barrier. Are there other such instances of commercial airliners (apart from Concorde and Concordeski) managing such a feat.

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pl4nekr4zy
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 3:37 am

I once read that a 747 (-200, I think) almost reached the speed of sound in a nose dive during a test flight.
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PW100
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 3:41 am

A specially modified DC-8 broke the sound barrier in a shallow dive before Concorde or TU-144 did so. I believe it actually was the first commercial transport to do so.

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suspen
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 6:56 am


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I thought there was also a DC-10 that broke the sound barrier in a controlled experiment with lots of ballast onboard?
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aa61hvy
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 6:59 am

You showed a SP not a DC10
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N766UA
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 7:06 am

Well maybe if AA61hvy would bother to read the caption he'd notice that the 747SP pictured actually broke the sound barrier....
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northstardc4m
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 9:54 am

actually it was an UNmodified Dc-8-43 that went past mach 1 in a controlled dive during flight testing. The aircraft was later delivered to Canadian Pacific as CF-CPG... so there, Canada had the worlds 1st supersonic airliner hehe.

The Cessna Citation X CAN go past mach 1, its certified to Mach 0.97 so it must have the capacity to exceed that by .06 mach, aka 1.03, to meet FAA certification standards.

A China Airlines 747SP may of gone past mach 1 in that uncontrolled dive, bu the aircraft was HEAVILY damaged, i say MAY because there were no external reliable information sources and the aircrafts own flight data recorder wasnt properly functioning at the time.
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 11:18 am

As someone already mentioned a DC-8 was the first airliner to exceed Mach 1. A Rolls-Royce-powered DC8 achieved fame in August 1961 by becoming the first commercial jetliner to exceed the speed of sound. The milestone was passed while a team was verifying the performance of a leading edge improvement in an aircraft destined for Canadian Pacific. Over Edwards Air Force base the DC-8 dived from 52,000 feet. It achieved a top speed of 660.6 MPH(Mach 1.012) at 41,088 feet.
 
767ALLTHEWAY
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 11:33 am

Hey what about the Convair 880/990? I know those were awfully fast jets, did they ever break it or ever come close?
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MxCtrlr
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 11:42 am

AFAIK, the B-707 (PA), B-727-200 (TW), DC-8 (as mentioned above) and B-747 (China Air) have all broken the sound barrier successfully. Of course, after they did this feat, they all spent extensive time in the hangar getting fixed but they at least held it together! I walsy said Boeing and Douglas build tanks and this proves it!

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suspen
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 12:22 pm

Sorry for the confusion, AA61hvy, I was in a hurry when I posted that. The SP is the "supersonic 747" and I said there was "also" a DC-10, but judging from the other comments in this thread, my memory was incorrect and it was actually a DC-8.  Smile
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 8:55 pm

That China Airlines 747SP was really bent after it went supersonic. I remember reading it was missing a whole lot of rivets, the wings and engine pylons were all bent and it was barely still intact when it landed.
 
FlySSC
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 10:50 pm

Hey...Come on !!!! Stop trying to find a Supersonic Boeing or Douglas or whatever...!  Wink/being sarcastic

There is ONE and olny ONE supersonic jetliner. We all know that. And there will probably never be another one.

The most beautiful flying creature ever made.

Her Majesty Concorde...!


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L-188
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RE: Airliners Breaking The Sound Barrier

Sun Aug 17, 2003 11:29 pm

FLYSSC....

You are going to get some zingers from the russians over that crack


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Didn't it also fly before it's western Copy also Big grin
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FlySSC
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RE: Airliners Breaking The Sound Barrier

Mon Aug 18, 2003 12:07 am

she maybe flew before...but not for a long time...and had a short career and sad destiny, as SHE was only a (bad) copy of the Concorde...!  Acting devilish
 
citationjet
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RE: Airliners Breaking The Sound Barrier

Mon Aug 18, 2003 12:13 am

NorthStarDC4M,
The Citation X has a Mmo = 0.92. The required pad for FAA requirements is 0.07. We had to fly to Md = 0.99 during envelope expansion and flutter testing. We used a T-38 as a chase plane (the one that was in the Pepsi commercials, N38CT owned by Chuck Thornton).
During the dive testing, we did exceed Mach 1.0, but were not required to by FAA regulation. As a result, we renamed a conference/meeting room at Cessna the "Mach 1". In it we have pictures of military/commercial supersonic aircraft. The Citation X is also pictured there.
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.
 
Jacques60
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RE: Airliners Breaking The Sound Barrier

Mon Aug 18, 2003 1:42 am

Coincidence ?
In july 1969 I flew a DC8 (sorry don't remember the type) on CP AMS/YUL
and (at that time it was easy) had a chat with crew in flight and they were positive that this very aircraft had broken sound barrier !
Too bad I did not notice the registration !!
 
FlySSC
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RE: Airliners Breaking The Sound Barrier

Mon Aug 18, 2003 3:41 am

----------------------------  Yeah sure...
 
ConcordeBoy
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RE: Airliners Breaking The Sound Barrier

Mon Aug 18, 2003 3:52 am

Sadly, SU-GAP also broke the sound barrier during its final death dive as well  Sad

It's seen here with another deceased supersonic aircraft... what a sad picture.  Sad

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