Right just looking in my Military Parade book from 2005 which is in effect a catalogue of the main naval weapons the APR series of weapons do a circle search pattern only.
The interesting feature is that they are dropped into the water and descend in a corkscrew patterwit the motor switched off, only engaging the motor once it has detected the target. So based on that I would leave the Stallion with the current payload and if you alter the APR series take into account what I have just written.
Also all sources seem to state the Type 82R torpedo as the payload for which I can't find much info or a recognisable name.
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