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New Tail Cones For AA MD-80's  
User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Posted (8 years 3 weeks 1 day 3 hours ago) and read 7835 times:

Periodically the topic of AA's low and high drag tailcones comes up on the forums. Well folks the older high drag tailcones will soon be a thing of the past.

When Jet A was cheap and AA was making money hand over fist replacing the older style cones was never a priority. However given the current price of Jet A and market conditions AA is looking to save money anywhere it can. One area obviously is aerodynamic improvements to it's fleet. We have already seen that with winglets on it's 757's and 737's. AA looked into buying MD-80 tailcones from Boeing. Unfortunately the price tag was $278,000. On the surplus market there were only two available. So AA decided to make their own low drag MD-80 tailcones at it's TUL facility.

Starting June AA started producing approximately eight a month in order to replace the 105 high drag tailcones in it's fleet. The cost to make them will be around $30,000. The old style tailcones burn up to $28,000 a year more in fuel. In little over a year AA will recoup the costs of production. Total fuel savings will be around $3 million. They will be installed when the aircraft makes a visit to TUL for light and heavy checks.

17 replies: All unread, jump to last
 
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 1, posted (8 years 3 weeks 1 day 2 hours ago) and read 7832 times:
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Any word on the percentage of drag reduction offered by the new tailcones?




2H4





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User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 3 weeks 1 day 2 hours ago) and read 7817 times:

Quoting 2H4 (Reply 1):
Any word on the percentage of drag reduction offered by the new tailcones?

From what I have heard it offers about a 1% reduction in fuel consumption.


User currently offlineHighFlyer9790 From United States of America, joined Jul 2005, 1241 posts, RR: 0
Reply 3, posted (8 years 3 weeks 1 day 1 hour ago) and read 7795 times:

Any pics of the high drag vs. low drag tail cones?


121
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17002 posts, RR: 67
Reply 4, posted (8 years 3 weeks 1 day 1 hour ago) and read 7785 times:

Quoting HighFlyer9790 (Reply 3):
Any pics of the high drag vs. low drag tail cones?

It's not really fair to call the pointy type "high drag". It's not like a drift anchor  Wink But yes, the flathead screwdriver AKA beavertail produces less drag.

Cone:

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Click here for bigger photo!

Photo © Damon Marcus Lewis



Screwdriver:

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Click here for bigger photo!

Photo © Stefan Sjögren - Stockholm Arlanda Photography




"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Reply 5, posted (8 years 3 weeks 1 day 1 hour ago) and read 7774 times:

They can replace the tailcone, just like that? How is that possible for a technical point of view? How do you proceed to replace the cone tail with the screwdriver tail?

This is another part of Douglas design that has truely surprised me. Too bad they're gone now.

BTW, just for the sake of a discussion, could it be possible to outfit for example NW's DC-9s with the screwdriver? Or is anything that is a DC-9-10 to -50 not designed for a change of tailcone? I know financially, NW might not be able to afford it, but hypothetically, is a tail swap like what AA will do on the MD-80, also possible on the classic DC-9s?


User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 6, posted (8 years 3 weeks 1 day ago) and read 7745 times:

Quoting LTU932 (Reply 5):
They can replace the tailcone, just like that? How is that possible for a technical point of view? How do you proceed to replace the cone tail with the screwdriver tail?

The tailcone on the MD-80 was designed to be jetisoned in the event of an emergency. It's quite easy to replace them. All you have to do is release the latches and off it comes. In the picture below you see the tail on an AA MD-80. The part that's painted grey, composite material, is the part that's being replaced.


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Photo © Dan Brownlee



Quoting LTU932 (Reply 5):
BTW, just for the sake of a discussion, could it be possible to outfit for example NW's DC-9s with the screwdriver? Or is anything that is a DC-9-10 to -50 not designed for a change of tailcone?

Since an MD-80 is nothing more than a stretched DC-9 I believe you could. I know that you can use the same radome on a DC-9 as on a MD-80.


User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Reply 7, posted (8 years 3 weeks 1 day ago) and read 7742 times:

Quoting LMP737 (Reply 6):
All you have to do is release the latches and off it comes.

OK, thanks.

Quoting LMP737 (Reply 6):
The tailcone on the MD-80 was designed to be jetisoned in the event of an emergency.

In which emergency situations do they do this? And what's the purpose of having to jettison the tailcone?


User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 8, posted (8 years 3 weeks 1 day ago) and read 7738 times:

Quoting LTU932 (Reply 7):
In which emergency situations do they do this? And what's the purpose of having to jettison the tailcone?

Anytime you have to get off that aircraft in a hurry. By having the tailcone jettionsable is just another added measure of safety. More ways off the aircraft increases chances of survival.


User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Reply 9, posted (8 years 3 weeks 1 day ago) and read 7736 times:

Quoting LMP737 (Reply 8):
Anytime you have to get off that aircraft in a hurry. By having the tailcone jettionsable is just another added measure of safety. More ways off the aircraft increases chances of survival.

OK, I understand that now. Thanks.


User currently offlineMD-90 From United States of America, joined Jan 2000, 8502 posts, RR: 12
Reply 10, posted (8 years 3 weeks 22 hours ago) and read 7715 times:

This DC-9-14 shows the jettisoned tail cone after an emergency evacuation.


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Photo © Juan Carlos Guerra - APM



User currently offlineStarlionblue From Greenland, joined Feb 2004, 17002 posts, RR: 67
Reply 11, posted (8 years 3 weeks 21 hours ago) and read 7665 times:

Quoting LTU932 (Reply 7):
Quoting LMP737 (Reply 6):
The tailcone on the MD-80 was designed to be jetisoned in the event of an emergency.

In which emergency situations do they do this? And what's the purpose of having to jettison the tailcone?

The aft slide is deployed through the hole left by the jettisoned tailcone. Faster than lowering the airstairs. Also, if the plane is lying on the ground the airstairs won't work.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineL-188 From United States of America, joined Jul 1999, 29791 posts, RR: 58
Reply 12, posted (8 years 3 weeks 19 hours ago) and read 7622 times:

Quoting Starlionblue (Reply 11):
Quoting LTU932 (Reply 7):
Quoting LMP737 (Reply 6):
The tailcone on the MD-80 was designed to be jetisoned in the event of an emergency.

In which emergency situations do they do this? And what's the purpose of having to jettison the tailcone?

The aft slide is deployed through the hole left by the jettisoned tailcone. Faster than lowering the airstairs. Also, if the plane is lying on the ground the airstairs won't work.

Anybody remember the movie "Cliffhanger"

That was one of the stunts. The tailcone is popped off a MD-80 and the bank robbers then rappel in to a trailing westwind..

All at 400 kts and 35,000 feet of course.



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User currently offlineDalmd88 From United States of America, joined Jul 2000, 2534 posts, RR: 14
Reply 13, posted (8 years 3 weeks 12 hours ago) and read 7560 times:

The "Cliffhanger" stunt looked cool, but it is impossible. The tail cone will not fall off while in flight. You can release it, but aerodynamic drag will keep it sucked up to the end of the plane.

User currently offlineAvConsultant From United States of America, joined Feb 2006, 1360 posts, RR: 3
Reply 14, posted (8 years 3 weeks 6 hours ago) and read 7500 times:

As a young kid in the 70's, I thought I remember hearing about a DC-9 tailcone separating in flight.

User currently offlineHighFlyer9790 From United States of America, joined Jul 2005, 1241 posts, RR: 0
Reply 15, posted (8 years 2 weeks 4 days 19 hours ago) and read 7299 times:

If the "flathead screwdriver" tail "cap" is high-drag, is it just me or does it look similar to the 777's tail cap. does this infer that the 777 has a high drag tail cap? (i didn't use "tail cone" because cone refers to the new low drag, does it not?)

so called "high drag" MD-80 tail:

View Large View Medium
Click here for bigger photo!

Photo © Stefan Sjögren - Stockholm Arlanda Photography



777 tail:

View Large View Medium
Click here for bigger photo!

Photo © Danny Fritsche - Airplanespotters




121
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17002 posts, RR: 67
Reply 16, posted (8 years 2 weeks 4 days 19 hours ago) and read 7297 times:

Quoting HighFlyer9790 (Reply 15):
If the "flathead screwdriver" tail "cap" is high-drag, is it just me or does it look similar to the 777's tail cap. does this infer that the 777 has a high drag tail cap? (i didn't use "tail cone" because cone refers to the new low drag, does it not?)

You got it turned around. The screwdriver is the lower drag, improved variant. The pointy one is the older variant.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineHighFlyer9790 From United States of America, joined Jul 2005, 1241 posts, RR: 0
Reply 17, posted (8 years 2 weeks 4 days 18 hours ago) and read 7286 times:

Quoting Starlionblue (Reply 16):
Quoting HighFlyer9790 (Reply 15):
If the "flathead screwdriver" tail "cap" is high-drag, is it just me or does it look similar to the 777's tail cap. does this infer that the 777 has a high drag tail cap? (i didn't use "tail cone" because cone refers to the new low drag, does it not?)

You got it turned around. The screwdriver is the lower drag, improved variant. The pointy one is the older variant.

oops, guess i did.  banghead  it makes much more sense to me now! thanks Starlionblue!



121
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