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Tornado Wing Sweep With Stores  
User currently offlineFlybaurLAX From United States of America, joined Oct 2008, 638 posts, RR: 0
Posted (4 years 11 months 1 week 15 hours ago) and read 6304 times:

I searched both military and technical forums, but couldn't find anything on this. I'm hoping this is the right place for this post.

I was wondering how the Tornado can swing it's wings back with stores on it, yet keep the stores aligned with the free stream airflow. I know the F-14 does not have any stores pods or mounts on the actual wing, and so the wing can move freely without any problems. How does the Tornado do it while having things attached to the wing? Is there a mechanism that pivots the mounts to keep the angle always parallel with the free stream airflow? I'd really like to know, as the Tornado is my favorite foreign fighter. Thanks


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9 replies: All unread, jump to last
 
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17039 posts, RR: 66
Reply 1, posted (4 years 11 months 1 week 14 hours ago) and read 6281 times:

The Tornado is unusual in this way. If I recall correctly the stores also swing as you have guessed.


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User currently offlineWingscrubber From UK - England, joined Sep 2001, 848 posts, RR: 0
Reply 2, posted (4 years 11 months 1 week 13 hours ago) and read 6276 times:

I'm curious about this too - searched but couldn't find anything on the pylon/hardpoint rotation, but I imagine they rotate either with their own mini-jackscrews like the main one which sweeps the wing, or with another kind of mechanical linkage and pivot. As an engineer I'd love to see drawings of how that design works...

Anyhow, one thing I did manage to turn up was a website with a little gallery of the actual wing-sweep jackscrew. Wikipedia has a nice pic of the pivot too.
http://www.tornado-data.com/Tid/galleries/wing_sweep.htm
http://en.wikipedia.org/wiki/File:To...o_variable_sweep_wing_Manching.JPG



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User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 3, posted (4 years 11 months 1 week 13 hours ago) and read 6270 times:



Quoting FlybaurLAX (Thread starter):
Is there a mechanism that pivots the mounts to keep the angle always parallel with the free stream airflow?



Quoting Starlionblue (Reply 1):
The Tornado is unusual in this way. If I recall correctly the stores also swing as you have guessed.

Just like the external stores (and fuel tanks) did on the FB-111.


User currently offlineFlybaurLAX From United States of America, joined Oct 2008, 638 posts, RR: 0
Reply 4, posted (4 years 11 months 1 week 13 hours ago) and read 6260 times:

Cool! Thanks for the replies. I had a feeling it was something like that, just wanted to hear it from the experts.

Quoting Wingscrubber (Reply 2):
As an engineer I'd love to see drawings of how that design works...

I completely agree.



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User currently offlineRwessel From United States of America, joined Jan 2007, 2351 posts, RR: 2
Reply 5, posted (4 years 11 months 1 week 10 hours ago) and read 6231 times:
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Quoting Wingscrubber (Reply 2):
I'm curious about this too - searched but couldn't find anything on the pylon/hardpoint rotation, but I imagine they rotate either with their own mini-jackscrews like the main one which sweeps the wing, or with another kind of mechanical linkage and pivot. As an engineer I'd love to see drawings of how that design works...

It could be as simple as a single push rod attached to the front of the hardpoint pivot and to a point on the fixed part of the aircraft the same distance forward from the wing pivot’s center as the hardpoint connection. Very crudely:

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User currently offlineFlybaurLAX From United States of America, joined Oct 2008, 638 posts, RR: 0
Reply 6, posted (4 years 11 months 1 week 9 hours ago) and read 6226 times:



Quoting Rwessel (Reply 5):
It could be as simple as a single push rod attached to the front of the hardpoint pivot and to a point on the fixed part of the aircraft the same distance forward from the wing pivot’s center as the hardpoint connection. Very crudely:

That makes complete sense, I was wondering if it was something that simple. I think this picture here shows possibly how it can pivot, sort of like a horizontal stab trim mechanism. If you look on the right wing of the aircraft (the left one in the pic as it's inverted) you can see a little arc towards the front of he pylon, which I believe would be a slit to allow the pylon to pivot.
http://archive.cs.uu.nl/pub/AIRCRAFT-IMAGES/Tornado.jpg



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User currently offlineGST From United Kingdom, joined Jun 2008, 932 posts, RR: 0
Reply 7, posted (4 years 11 months 1 week 4 hours ago) and read 6186 times:

This brings me back, havent thought about it since being a kid making a squadron of Airfix tornados, and wondering why the weapons looked silly when you pulled the wings back (the kits had the wings movable).

User currently offlineWingscrubber From UK - England, joined Sep 2001, 848 posts, RR: 0
Reply 8, posted (4 years 11 months 6 days 7 hours ago) and read 6067 times:



Quoting Rwessel (Reply 5):
It could be as simple as a single push rod attached to the front of the hardpoint pivot and to a point on the fixed part of the aircraft the same distance forward from the wing pivot’s center as the hardpoint connection.

That's got to be it, now I feel kind of stupid...  banghead  So it just swings like a parallelogram, simple!  idea  It'd work with two linkages as easily as one, that'd add redundancy - and thinking about it, the mechanism wouldn't have to be anything robust as a mini-jackscrew as I suggested because so long as the aircraft isn't side-slipping hard at Mach 2 those stores probably don't see much of a side load!

I've just been brain washed by working on the Citation X... nothing's simple on that bird, seems my basic geometry's gone out the window.  headache 



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User currently offlineAesma From France, joined Nov 2009, 6651 posts, RR: 11
Reply 9, posted (4 years 9 months 1 week 3 hours ago) and read 5190 times:

I was wondering that too, and the push-rod thing is a good possibility. There are Tornados with two wing mounts so a screw rotating them with a motor or a pump could also work. Thinking of it, there are far more complex engineering problems when designing a sweeping wing, like how the cables, hydraulics, controls, work with the sweeping, how the change in sweep changes the center of gravity and the center of lift, etc.


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