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scbriml
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Tu-154 Pointy Thing

Wed Oct 12, 2005 6:11 am

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.
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Starlionblue
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RE: Tu-154 Pointy Thing

Wed Oct 12, 2005 7:04 am

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

No seriously I think it's some sort of counterweight for the stab. Or something.
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corey07850
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RE: Tu-154 Pointy Thing

Wed Oct 12, 2005 7:40 am

Looks like an HF antenna??? Maybe, perhaps???
 
320tech
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RE: Tu-154 Pointy Thing

Wed Oct 12, 2005 8:18 am

Well, the name is "bullet fairing" for the obvious reason. What it houses, I don't know. It might also just be aerodynamic.
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prebennorholm
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RE: Tu-154 Pointy Thing

Wed Oct 12, 2005 8:23 am

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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DC-9

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KevinL1011
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RE: Tu-154 Pointy Thing

Wed Oct 12, 2005 12:35 pm

Maybe is a jackscrew faring?
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TripleDelta
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RE: Tu-154 Pointy Thing

Wed Oct 12, 2005 3:51 pm

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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Il-62:

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Il-76 and Il-78:

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HAWK21M
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RE: Tu-154 Pointy Thing

Wed Oct 12, 2005 4:13 pm


Most likely an HF Antenna.
BTW How would the Horizontal Stablizer Srewjack rod be mounted.
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MEL
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jush
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RE: Tu-154 Pointy Thing

Wed Oct 12, 2005 6:02 pm

no no HF antenna.! Defenitely the new anti missile system Big grin
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sovietjet
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RE: Tu-154 Pointy Thing

Thu Oct 13, 2005 7:47 am

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
 
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HAWK21M
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RE: Tu-154 Pointy Thing

Thu Oct 13, 2005 2:45 pm

Do Models count  Smile










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MEL
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gkirk
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RE: Tu-154 Pointy Thing

Fri Oct 14, 2005 3:27 am

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 
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scbriml
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RE: Tu-154 Pointy Thing

Fri Oct 14, 2005 6:25 am

Thanks for the input guys - apart from Kirky!  wink 

I'm not sure I'm any the wiser.
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A350
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RE: Tu-154 Pointy Thing

Sat Oct 22, 2005 1:27 am

Isn't it a trim tank?  twocents 

A350
 
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scbriml
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RE: Tu-154 Pointy Thing

Wed Nov 02, 2005 4:04 am

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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BEG2IAH
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RE: Tu-154 Pointy Thing

Wed Nov 02, 2005 4:16 am

This is what you need:


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BEG2IAH
 
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HAWK21M
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RE: Tu-154 Pointy Thing

Wed Nov 02, 2005 2:14 pm

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