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Concorde's "bulge" On The Vertical Fin Question  
User currently offlineStudentFlyer From Australia, joined Sep 2004, 688 posts, RR: 3
Posted (10 years 2 months 3 weeks 3 days 8 hours ago) and read 4554 times:

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]

13 replies: All unread, jump to last
 
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17173 posts, RR: 66
Reply 1, posted (10 years 2 months 3 weeks 3 days 8 hours ago) and read 4526 times:

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."
User currently offlineStudentFlyer From Australia, joined Sep 2004, 688 posts, RR: 3
Reply 2, posted (10 years 2 months 3 weeks 3 days 7 hours ago) and read 4519 times:

Thanks Starlionblue.

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

Regards,
AK


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17173 posts, RR: 66
Reply 3, posted (10 years 2 months 3 weeks 3 days 7 hours ago) and read 4495 times:

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."
User currently offlineLapper From United Kingdom, joined Mar 2002, 1568 posts, RR: 7
Reply 4, posted (10 years 2 months 3 weeks 3 days 5 hours ago) and read 4362 times:

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 © Peter Unmuth - VAP
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Photo © Daubagna Vincent


(Sorry, couldn't find any profile shots!)


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17173 posts, RR: 66
Reply 5, posted (10 years 2 months 3 weeks 3 days 3 hours ago) and read 4213 times:

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."
User currently offlineStudentFlyer From Australia, joined Sep 2004, 688 posts, RR: 3
Reply 6, posted (10 years 2 months 3 weeks 2 days 13 hours ago) and read 3944 times:

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


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17173 posts, RR: 66
Reply 7, posted (10 years 2 months 3 weeks 2 days 9 hours ago) and read 3934 times:

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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Photo © Michael Catchpole
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Photo © Willem Honders




"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineStudentFlyer From Australia, joined Sep 2004, 688 posts, RR: 3
Reply 8, posted (10 years 2 months 3 weeks 2 days 8 hours ago) and read 3914 times:

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

Regards,
AK


User currently offlineMiamiair From , joined Dec 1969, posts, RR:
Reply 9, posted (10 years 2 months 3 weeks 2 days 7 hours ago) and read 3907 times:

Not to mention independent hydraulic systems (Sys A & Sys B).

User currently offlineStudentFlyer From Australia, joined Sep 2004, 688 posts, RR: 3
Reply 10, posted (10 years 2 months 3 weeks 1 day 17 hours ago) and read 3810 times:

Thanks for the further info, Miamiair  Smile

Regards,
AK


User currently offlineGDB From United Kingdom, joined May 2001, 13253 posts, RR: 77
Reply 11, posted (10 years 2 months 3 weeks 23 hours ago) and read 3696 times:

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.



User currently offlineGDB From United Kingdom, joined May 2001, 13253 posts, RR: 77
Reply 12, posted (10 years 2 months 3 weeks 23 hours ago) and read 3695 times:

More pics and diagrams;

http://www.concordesst.com/flightsys.html

http://www.concordesst.com/inside/7.html

http://www.concordesst.com/model101/taster/sd9.jpg


User currently offlineStudentFlyer From Australia, joined Sep 2004, 688 posts, RR: 3
Reply 13, posted (10 years 2 months 2 weeks 6 days 10 hours ago) and read 3604 times:

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

Regards,
AK


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