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Tu-154 Pointy Thing  
User currently offlineScbriml From United Kingdom, joined Jul 2003, 14071 posts, RR: 45
Posted (9 years 10 months 3 weeks 6 days 19 hours ago) and read 4819 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. Fruit flies like a banana!
16 replies: All unread, jump to last
 
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17365 posts, RR: 66
Reply 1, posted (9 years 10 months 3 weeks 6 days 18 hours ago) and read 4795 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, 2534 posts, RR: 4
Reply 2, posted (9 years 10 months 3 weeks 6 days 17 hours ago) and read 4777 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 10 months 3 weeks 6 days 16 hours ago) and read 4754 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, 6844 posts, RR: 54
Reply 4, posted (9 years 10 months 3 weeks 6 days 16 hours ago) and read 4752 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
User currently offlineKevinl1011 From United States of America, joined Mar 2005, 2964 posts, RR: 45
Reply 5, posted (9 years 10 months 3 weeks 6 days 12 hours ago) and read 4698 times:

Maybe is a jackscrew faring?


474218, Carl, You will be missed.
User currently offlineTripleDelta From Croatia, joined Jul 2004, 1150 posts, RR: 6
Reply 6, posted (9 years 10 months 3 weeks 6 days 9 hours ago) and read 4667 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, 31796 posts, RR: 55
Reply 7, posted (9 years 10 months 3 weeks 6 days 9 hours ago) and read 4659 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, 1638 posts, RR: 3
Reply 8, posted (9 years 10 months 3 weeks 6 days 7 hours ago) and read 4645 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, 2679 posts, RR: 16
Reply 9, posted (9 years 10 months 3 weeks 5 days 17 hours ago) and read 4511 times:
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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, 31796 posts, RR: 55
Reply 10, posted (9 years 10 months 3 weeks 5 days 10 hours ago) and read 4452 times:

Do Models count  Smile










regds
MEL



Think of the brighter side!
User currently offlineGkirk From UK - Scotland, joined Jun 2000, 25278 posts, RR: 55
Reply 11, posted (9 years 10 months 3 weeks 4 days 21 hours ago) and read 4371 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, 14071 posts, RR: 45
Reply 12, posted (9 years 10 months 3 weeks 4 days 18 hours ago) and read 4333 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. Fruit flies like a banana!
User currently offlineA350 From Germany, joined Nov 2004, 1115 posts, RR: 21
Reply 13, posted (9 years 10 months 2 weeks 3 days 23 hours ago) and read 4095 times:

Isn't it a trim tank?  twocents 

A350


User currently offlineScbriml From United Kingdom, joined Jul 2003, 14071 posts, RR: 45
Reply 14, posted (9 years 10 months 6 days 21 hours ago) and read 3878 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. Fruit flies like a banana!
User currently offlineBEG2IAH From United States of America, joined Apr 2004, 1009 posts, RR: 19
Reply 15, posted (9 years 10 months 6 days 20 hours ago) and read 3877 times:

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, 31796 posts, RR: 55
Reply 16, posted (9 years 10 months 6 days 10 hours ago) and read 3808 times:

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



Think of the brighter side!
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