"The
flying submarine was intended for ship destruction both
in the open sea and enemy harbors protected by minefields and obstacles. A low underwater
speed and limited action radius under water were not obstacles, because if there were no
targets in the assigned square (region of action)*, the LPL boat could find enemy targets
elsewhere by itself. After finding its targets from the air, the LPL would land beyond the
horizon, out of detection range from the enemy. It would immerse itself and track the
ship. Before the appearance of a target within firing range, the LPL would remain silently
at depth, without expending energy by excess motions.
In case of the enemy ships deviated from the path of the waiting LPL, it would slowly
pursue the ship. With the very large deviation of target boat, the LPL would pass over the
horizon from the ship, surface, take off and again prepare for attack
Repeated approaches to the target ship was considered as one of the essential advantages
the LPL flying submarine held over conventional submarines. Especially effective was the
action of flying submarines in a wolf pack, since theoretically three LPL's could blockade
an area up to nine miles wide."
More:
http://jg51.net/forums/viewthread.ph...tion=printable
SHV perhaps?