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Originally Posted by Bubblehead Nuke
IPlanes in the sail, which we called 'fairwater' planes are closer to the ships center of bouyancy and mass, Thus they exert a more up/down force rather than a rotational force. The bow planes are farther away from the center of rotation and thus move the whole bow up or down. It is easier to maintain depth with fairwater planes as you have less hull rotation with control surface movement.
With that being said, bow planes are more useful in a stern plane casualty situation as they CAN provide a counterforce. With fairwater planes a jam dive situation is BAD as there is not enough control authority (do to the LACK of hull rotation) to use the fairwater planes to bring the angle off the boat.
This is the primary reason they went BACK to bow planes as you have increased control authority in a casualty situation
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Then why not bow planes AND fairwater planes? Bow planes for casulties and fairwater for dept control and you have your backup if the other breaks...
