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Tu-154 Pointy Thing  
User currently offlineScbriml From United Kingdom, joined Jul 2003, 12866 posts, RR: 46
Posted (9 years 2 months 1 week 2 days 10 hours ago) and read 4439 times:
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Does the "pointy thing" at the top of the tail of a Tu-154 have a proper name?

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Does anyone have any history on the "pointy thing"? I have some shots of very early 154s that I took in Russia in August where the "pointy thing" is very different.


Time flies like an arrow, but fruit flies like a banana! #44cHAMpion
16 replies: All unread, jump to last
 
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17166 posts, RR: 66
Reply 1, posted (9 years 2 months 1 week 2 days 9 hours ago) and read 4415 times:

It's to poke holes in A380s!!! Big grin

No seriously I think it's some sort of counterweight for the stab. Or something.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineCorey07850 From United States of America, joined Feb 2004, 2528 posts, RR: 5
Reply 2, posted (9 years 2 months 1 week 2 days 8 hours ago) and read 4397 times:

Looks like an HF antenna??? Maybe, perhaps???

User currently offline320tech From Turks and Caicos Islands, joined May 2004, 491 posts, RR: 5
Reply 3, posted (9 years 2 months 1 week 2 days 8 hours ago) and read 4374 times:

Well, the name is "bullet fairing" for the obvious reason. What it houses, I don't know. It might also just be aerodynamic.


The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6534 posts, RR: 54
Reply 4, posted (9 years 2 months 1 week 2 days 8 hours ago) and read 4372 times:

No, Stallionblue, the pointy thing cannot house a tailplane balance weight. The pointy shape would not allow enough movements up and down. But it is almost sure that the top of the leading edge of the fin - where the sweep-back ends - contains a tailplane anti-flutter balance weight.

I think that the pointy thing has two purposes:

1. It gives some drag reduction by "area ruling" the otherwise rather draggy tailplane / fin intersection.

2. It houses the VHF antenna.

Looking at the MD-80 we see that area ruling thing done in a somewhat different way. In front of of the tailplane the leading edge of the fin is excessively thick and seems to slim down - or at least not get thicker - at the tailplane leading edge.

I am pretty sure that this feature produces a slight drag reduction compared to the DC-9 which seems to have a more or less unchanged fin airfoil section from root to tip. But only at high cruising speed where the DC-9 has a widening fin profile combimed with widening tailplane profile and that way may produce high, local transsonic drag.

MD-80

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Photo © Vasanth Dharmarajan


DC-9

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Photo © Remi Dallot




Always keep your number of landings equal to your number of take-offs, Preben Norholm
User currently offlineKevinl1011 From United States of America, joined Mar 2005, 2964 posts, RR: 47
Reply 5, posted (9 years 2 months 1 week 2 days 3 hours ago) and read 4318 times:

Maybe is a jackscrew faring?


474218, Carl, You will be missed.
User currently offlineTripleDelta From Croatia, joined Jul 2004, 1124 posts, RR: 7
Reply 6, posted (9 years 2 months 1 week 2 days ago) and read 4287 times:
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PHOTO SCREENER

As far as I know, it's an HF antenna, similar to the one on the 707, but faired in. Some other Russian aircraft, notably 60s-80s civil jets, have it as well:

Tu-134:

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Photo © Alan Lebeda


Il-62:

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Photo © Roel van der Velpen


Il-76 and Il-78:

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Photo © Christian Waser
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Photo © Voortmans Dirk




No plane, no gain.
User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 7, posted (9 years 2 months 1 week 2 days ago) and read 4279 times:


Most likely an HF Antenna.
BTW How would the Horizontal Stablizer Srewjack rod be mounted.
regds
MEL



Think of the brighter side!
User currently offlineJush From Germany, joined Apr 2005, 1636 posts, RR: 3
Reply 8, posted (9 years 2 months 1 week 1 day 22 hours ago) and read 4265 times:

no no HF antenna.! Defenitely the new anti missile system Big grin


There is one problem with airbus. Though their products are engineering marvels they lack passion, completely.
User currently offlineSovietjet From Bulgaria, joined Mar 2003, 2648 posts, RR: 17
Reply 9, posted (9 years 2 months 1 week 1 day 8 hours ago) and read 4131 times:

HF antenna but on the initial production Tu-154(before the Tu-154A, B, B-1, B-2 and M) it is smaller like on this one here


Now please....post those pics of the old Tu-154s!!!!  Smile  Smile  Smile  Smile


User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 10, posted (9 years 2 months 1 week 1 day 1 hour ago) and read 4072 times:

Do Models count  Smile










regds
MEL



Think of the brighter side!
User currently offlineGkirk From UK - Scotland, joined Jun 2000, 24964 posts, RR: 56
Reply 11, posted (9 years 2 months 1 week 13 hours ago) and read 3991 times:

Quoting Scbriml (Thread starter):
Does the "pointy thing" at the top of the tail of a Tu-154 have a proper name?

Well you know how daddy planes and mummy planes make baby planes?  duck 



When you hear the noise of the Tartan Army Boys, we'll be coming down the road!
User currently offlineScbriml From United Kingdom, joined Jul 2003, 12866 posts, RR: 46
Reply 12, posted (9 years 2 months 1 week 10 hours ago) and read 3953 times:
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Thanks for the input guys - apart from Kirky!  wink 

I'm not sure I'm any the wiser.



Time flies like an arrow, but fruit flies like a banana! #44cHAMpion
User currently offlineA350 From Germany, joined Nov 2004, 1101 posts, RR: 22
Reply 13, posted (9 years 1 month 4 weeks 1 day 15 hours ago) and read 3715 times:

Isn't it a trim tank?  twocents 

A350



Photography - the art of observing, not the art of arranging
User currently offlineScbriml From United Kingdom, joined Jul 2003, 12866 posts, RR: 46
Reply 14, posted (9 years 1 month 2 weeks 4 days 12 hours ago) and read 3498 times:
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Quoting Sovietjet (Reply 9):
Now please....post those pics of the old Tu-154s!!!!

Took a while, but here you go:

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Photo © Steve Brimley
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Photo © Steve Brimley




Time flies like an arrow, but fruit flies like a banana! #44cHAMpion
User currently onlineBEG2IAH From United States of America, joined Apr 2004, 980 posts, RR: 18
Reply 15, posted (9 years 1 month 2 weeks 4 days 12 hours ago) and read 3497 times:
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This is what you need:


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Photo © Milan Vladisavljevic



BEG2IAH



FAA killed the purpose of my old signature: Use of approved electronic devices is now permitted.
User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 16, posted (9 years 1 month 2 weeks 4 days 2 hours ago) and read 3428 times:

So what Exactly is It Finally.Anyone having worked on them.
regds
MEL



Think of the brighter side!
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