studentflyer
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Concorde's "bulge" On The Vertical Fin Question

Wed Sep 29, 2004 10:19 pm

I noticed that there is a "bulge" on the vertical fin stabilizer in Concordes. One on port side being lower than that to the starboard side. Has anyone noticed this before? What does this "bulge" acheive - what purpose? -. Also, what is the actual name for these things called?


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Photo © Paul Ashenden


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Photo © David Goose


Notice the "bulge" on the tail fin...

I apologise if someone has asked this question before in this forum...

Thanks,
AK

[Edited 2004-09-29 15:24:31]
 
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Starlionblue
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RE: Concorde's "bulge" On The Vertical Fin Question

Wed Sep 29, 2004 10:29 pm

The fin is so thin that the actuators for the rudders wouldn't fit on the inside. So they put them on the outside inside the fairings you see.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
studentflyer
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RE: Concorde's "bulge" On The Vertical Fin Question

Wed Sep 29, 2004 10:34 pm

Thanks Starlionblue.

So they are just housing to the rudder actuators? Do they cause any aerodynamic improvements at all?

Regards,
AK
 
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Starlionblue
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RE: Concorde's "bulge" On The Vertical Fin Question

Wed Sep 29, 2004 11:00 pm

So they are just housing to the rudder actuators? Do they cause any aerodynamic improvements at all?


Well, yes and no. the best solution would of course have been a smooth rudder, so in that way the fairings are not an improvement. However it's of course better to have an aerodynamic fairing that just putting the mechanism in the open air  Big grin. Compare to flap track fairings on the wings of airliners.

"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
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lapper
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RE: Concorde's "bulge" On The Vertical Fin Question

Thu Sep 30, 2004 1:12 am

If you look at the vertical fin in profile, you'll also see that the "bulges" are in different places on each side.

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Photo © Daubagna Vincent


(Sorry, couldn't find any profile shots!)
 
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Starlionblue
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RE: Concorde's "bulge" On The Vertical Fin Question

Thu Sep 30, 2004 3:29 am

Thx for the pics Lapper.

The reason for the fairings being at different heights is that the left one is for the lower rudder and the right one is for the upper rudder (Concorde has two rudders). Putting them one on each side is of course a matter of balance.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
studentflyer
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RE: Concorde's "bulge" On The Vertical Fin Question

Thu Sep 30, 2004 5:10 pm

But putting one higher than the other does not make any imbalance does it?? Also, why do they have 2 rudders? This also applies to other airliners doesn't it?

BTW, thanx for the pics too Lapper! It looks much clearer than the ones I found  Smile

Thanks,
AK
 
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Starlionblue
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RE: Concorde's "bulge" On The Vertical Fin Question

Thu Sep 30, 2004 9:18 pm

But putting one higher than the other does not make any imbalance does it?? Also, why do they have 2 rudders? This also applies to other airliners doesn't it?

A little imbalance yes, but the fin needs to be the same weight and have the same drag on each side. And that is pretty much achieved. Beyond that, the little imbalance has little effect.

The 2 rudders are for redundancy. Many aircraft have two rudders, for example the 747:


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"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
studentflyer
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RE: Concorde's "bulge" On The Vertical Fin Question

Thu Sep 30, 2004 10:26 pm

Thanks for the info and your time, Starlionblue. It's very much appreciated  Smile

Regards,
AK
 
miamiair
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RE: Concorde's "bulge" On The Vertical Fin Question

Thu Sep 30, 2004 10:51 pm

Not to mention independent hydraulic systems (Sys A & Sys B).
Molon Labe - Proud member of SMASH
 
studentflyer
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RE: Concorde's "bulge" On The Vertical Fin Question

Fri Oct 01, 2004 1:23 pm

Thanks for the further info, Miamiair  Smile

Regards,
AK
 
GDB
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RE: Concorde's "bulge" On The Vertical Fin Question

Sat Oct 02, 2004 6:53 am

There were in fact three hydraulic systems, Blue Green and Stby (Yellow).

Operated at 4000 p.s.i. using M2V rather than the usual Skydrol, more viscous and designed to operate at higher temps and pressures.

Green System;
Nos.1 and 2 engine intakes.
Flying controls.
Landing gear. including wheel brakes and steering.
Droop nose and visor.
Fuel transfer pump.
Emergency A.C. generator.

Blue System;
Nos.3 and 4 engine intakes.
Flying controls.
Fuel transfer pump.

Yellow System;
Nos. 1, 2, 3 and 4 engine intakes.
Flying controls.
Wheel Brakes.
Landing gear.
Droop nose and visor.

The fairings were for the P.F.C.U. an electro-hydraulic system with two jacks.

 
 
studentflyer
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RE: Concorde's "bulge" On The Vertical Fin Question

Sun Oct 03, 2004 7:40 pm

GDB, Thanks for the in-depth explanations. It's very much appreciated  Smile

Regards,
AK

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