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zippyjet
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Why No "Clarinet Look" On The 787?

Wed Aug 31, 2005 10:19 am

Ok, so cast me into the eye of Hurricane Katrina if this has been covered before: Some MD 80 series, the 717 and of course the 777 have in place of a tail cone, a squared off Clarinet back. How come the 787 has deep sixed the Clarinet ending?


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aeroweanie
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RE: Why No "Clarinet Look" On The 787?

Wed Aug 31, 2005 12:37 pm

We call them screwdriver tails. The problem is that the rear end of the fuselage is also a good place to put the APU exhaust. On the 777 Boeing put the APU exhaust on the side of the screwdriver. It was found that this created a lot of ramp noise. On the 787, the APU exhaust placement and noise concerns won out and the fuselage won't end in a screwdriver tail.
 
videns
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RE: Why No "Clarinet Look" On The 787?

Wed Aug 31, 2005 12:49 pm

Isn't the screwdriver tail much better in terms of drag? I thought that's why modern airliners had them. (Of course A320, A330, and A340 aircraft don't).
I would have thought that fuel burn would win over ramp noise...
Obviously I'm wrong... Anybody care to explain?

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HAWK21M
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RE: Why No "Clarinet Look" On The 787?

Wed Aug 31, 2005 6:15 pm


Any Latest Actual pics on the B787.Apart from the Nose section.
regds
MEL
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aeroweanie
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RE: Why No "Clarinet Look" On The 787?

Wed Aug 31, 2005 8:34 pm

Quoting Videns (Reply 2):
Isn't the screwdriver tail much better in terms of drag?

The screwdriver tail provides a 1% drag reduction on the MD80.
 
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VirginFlyer
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RE: Why No "Clarinet Look" On The 787?

Wed Aug 31, 2005 9:30 pm

MEL - take a look at http://www.boeing.com/commercial/7e7/photos.html which has a side on view of the 787 in its final configuration, complete with the 767 style tailcone...

V/F
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Starlionblue
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RE: Why No "Clarinet Look" On The 787?

Wed Aug 31, 2005 11:01 pm

Quoting AeroWeanie (Reply 4):
Quoting Videns (Reply 2):
Isn't the screwdriver tail much better in terms of drag?

The screwdriver tail provides a 1% drag reduction on the MD80.

Aeroweanie is of course better versed in aerodynamics, but I would think the 767 and 330/340 tailcones are a bit more advanced than the original DC-9 ones.
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aeroweanie
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RE: Why No "Clarinet Look" On The 787?

Wed Aug 31, 2005 11:40 pm

Quoting Starlionblue (Reply 6):
Aeroweanie is of course better versed in aerodynamics, but I would think the 767 and 330/340 tailcones are a bit more advanced than the original DC-9 ones.

Yes, the 1% is comparing the original DC-9 tailcone, which wasn't too great, with the MD80 screwdriver tail. The 767 style contraction to the APU exhaust is probably pretty decent too. The idea of the screwdriver tail is that you need a bit less contraction vertically and you provide an unambiguous trailing edge.
 
N766UA
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RE: Why No "Clarinet Look" On The 787?

Thu Sep 01, 2005 9:44 am

Clarinet? That one's new to me. I've always known it as the screwdriver. To answer the question, though, all airplanes are different. The 787 is probably designed in such a way that, aerodynamically, it doesn't need the screwdriver. I'm not an engineer so I can't say why but... that's the most likely reason.
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MD-90
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RE: Why No "Clarinet Look" On The 787?

Thu Sep 08, 2005 8:45 am

I play clarinet, and I've never thought of it that way before. (a lovely French product, the LeBlanc Concerto). It does sort of look like a clarinet mouthpiece, if you discount the top of the cone (under the tail).

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