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Re: Control surface configurations (was: Typhoon)

On Sun, 11 Jul 1999 16:56:16 -0700 michaelbholt writes:
>On Sun, 11 Jul 1999 14:22:58 -0400 "Allan Gaines" writes:
>>    I *think* I've seen pics of some foreign (non-US) subs
>>whose tailplanes were "cruciform" (an "X") instead of a
>>"cross" when viewed from the rear.  Is this why?  To
>>avoid turbulence caused by the sail/conning tower?
>
>You've seen the photos.   I think it's a Dutch boat that has
>the X-planes.  
>
>I have a book that explains why X-form works well.  Right now I can't 
>find the book (my Other Half has been on a cleaning rampage, and she 
>might have filed it somewhere).   But I do recall that one very real 
>advantage is that the sub can bottom without danger to the controls.
>
>As soon as the book surfaces, I'll provide a complete report.

OK, the book surfaced.   But now, in my search, I've collected a pile
of books for which I must now find shelves.   And she thinks I',
engaged on a cleanup, which makes her smile a lot.

Not only have I dug a couple of holes for myself domestically, I've
also been reduced to replying to my own post.    There's a lesson
of some sort here.

The book is "Submarine Design Concepts," by Burcher and Rydill.

Anyway, the X-stern has a number of advantages.  There are TWO 
surfaces submerged when the sub is surfaced.   If one pair of fins 
jams, you've not lost control because the other pair is still functional,

and in the same plane.    

Disadvantages are complexity and overcrowding of hardware at the
stern and an interaction when turning which produces a vertical 
movement when only horizontal movement is desired.

Pages 181- 186, inclusive.


Mike Holt
-- 

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