[PSUBS-MAILIST] MIR aft planes

["Joseph Perkel" <joeperkel@hotmail.com>]

Can someone please explain to me the precise function and mechanics of the 
aft planes / stabilizer on the MIR submersibles?

In this image, you can see it rotated at an exaggerated angle, which makes 
me wonder if this was done  mechanically by the pilot from within, or the 
unit is "free pivoting" for some reason which escapes me.

http://www7430.nrlssc.navy.mil/7432/hydrates/images/Muir_1.jpg

Why then I also wonder, the extreme sweep-back of these planes? You see this 
in aircraft for aerodynamic purposes in the transonic flight envelope 
(airliners) but, why here? This is repeated in both MIR's as well as the 
proposed Alvin replacement.

Any info is most appreciated, even an educated guess.


Joe





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