n9801f
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727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 1:31 am

Did Boeing consider further stretching the 727-200?

I have a hazy memory of a design with fuselage plug, tandem gear, uprated engines, etc.

Am I imagining things here, or can someone provide details?
 
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yyz717
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 2:05 am

Yes. Boeing offered a stretched 727-300 in the mid-70's. UA was the only airline that publically showed interest. The 723 never got beyond the drawing board.



I dumped at the gybe mark in strong winds when I looked up at a Porter Q400 on finals. Can't stop spotting.
 
Bluewave 707
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 3:09 am

The -300 was a proposal that is profiled in some books detailing the 727, 757, or the Boeing Co. as a whole. The 752 and 734 became replacements for the 722. Too bad the 727-300 never materialized.
"The best use of your life will be to so live your life, that the use of your life will outlive your life" -- D Severn
 
OldAeroGuy
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 3:17 am

The 727-300 did get a little further than the drawing board as flight testing was done on the Boeing owned 727 with the revised leading edge proposed for the -300. The new system replaced the outboard slats with variable camber Kruegers similar to those used on the 747.

The new leading edge devices allowed a higher stall angle of attack. Part of the flight tests evaluated the implications of this higher stall angle on h. tail entry into the wing wake and the subsequent loss of stall recovery capability (i.e. "deep stall"). The concern was accentuated by the larger diameter of the JT8D-217 engines proposed for the -300 compared to the standard JT8D.

Ultimately, the technology level of the -217 engine combined with the 727 three person flight crew could not over come the operating cost advantages of high bypass ratio Twins with two person crews, giving rise to the 737/CFM56 and the 757.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
n9801f
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 4:11 am

Very interesting, and thank you all for your replies.

With 3 -217's, it's easy to imagine that this thing would have had good takeoff performance and range, but perhaps would have looked more like a Tu-154...

Again, thank you for the information.
 
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Starlionblue
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 4:40 am

There was also this proposal:

"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
n9801f
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 5:37 am

Aha - so it's a twin!

Starlion, huge thanks for this.

It looks like it was really ahead of its time technologically - winglets, etc. Though it's easy to see how such a 3-crew plan would have been squeezed (un)economically between the MD-80 and 757.
 
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Starlionblue
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 5:56 am

Well, let's not get confused here. As far as I know, The 727-300 and the 787-300 were different proposals. The 727-300 was still a triplet with a modified wing, wide fan engines and bogie landing gear.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
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yyz717
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 1:38 pm

As far as I know, The 727-300 and the 787-300 were different proposals.

True. The 723 was a proposed simple stretch of the 722.

I dumped at the gybe mark in strong winds when I looked up at a Porter Q400 on finals. Can't stop spotting.
 
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F-WWKH
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 9:02 pm

Obviously this 787 is a recent proposal, at least not much older than plans for the B777. Oh how much I would love to see Boeing go ahead with this design, the B727 lines are still THE most elegant ones in aviation. But very likely this design is superseeded by the Dreamliner.
 
godbless
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 9:43 pm

The 727-300 and the 787-300 can't have anything to do with eachother. As you can see the 787 has the new Boeing logo beside the titles so it's a post-MDD-merger thing. Maybe it was an idea to keep the MDD people happy by having a plane looking similar to the MD-80...

Max
 
Aircellist
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RE: 727-400X - Never Flew Off The Drawing Board?

Sat Jan 08, 2005 10:38 pm

This 787-300...

What a nice looking fake! Reminds us that yes, the lines of the 727 were so elegant...
"When I find out I was wrong, I change my mind. What do you do?" -attributed to John Maynard Keynes
 
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RayChuang
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RE: 727-400X - Never Flew Off The Drawing Board?

Sun Jan 09, 2005 12:31 am

Actually, during the late 1970's Boeing seriously looked at designing a 727-300 that dispensed with the three JT8D engines in favor of two PW2037 engines. If that project had gone ahead it would have likely cause Airbus to lose a lot of A320 orders because airlines like IB, LH and AZ would have bought this plane en masse for parts commonality reasons and Boeing would likely have kept the 727 line going even today!
 
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N328KF
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RE: 727-400X - Never Flew Off The Drawing Board?

Sun Jan 09, 2005 1:01 am

That 787-300 design looks fake to me. Especially since it says "drawn by DKDesign." But the real clue is the fact that the Boeing typeface is screwed up.
When they call the roll in the Senate, the Senators do not know whether to answer 'Present' or 'Not guilty.' -Theodore Roosevelt
 
dennys
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RE: 727-400X - Never Flew Off The Drawing Board?

Sun Jan 09, 2005 1:04 am

cann't they make a new 707-800X ?????


707s lover .
 
srbmod
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RE: 727-400X - Never Flew Off The Drawing Board?

Sun Jan 09, 2005 1:13 am

There have been several plans that never went too far to turn the 727 into a twinjet with the #2 engine removed, as well as the intake. I remember seeing a picture on here a few years back of a model of a twin-engine 727 in Delta colors. It looked liked the chubby brother of the MD-80...