UEST-80 - are you thinking maybe about some kind of speed/working mode dependance ? For example, if one launches 50kts USET it will always enable active, if low speed - active or passive as set. Or the other way - passive setting would force slow run ? Or we leave this for user to remember ? :-)
TEST-71 - I don't know, but maybe TEST can change speed during run... Or maybe not. I have to check what commands can be send by TEST-71 wire datalink. It is not said clearly that you can change torpedo speed by wire in my sources... But USET-80 had probably one speed setting. You could set it to different values, but once set, torpedo run all distance on that speed. When I readed all materials once again, I find this to be cited much more often and it makes more sense, as torpedo speed is reporded as 50, 48 or 45kts with little different ranges. The TEST-71 on the other hand, is clearly stated to have electric engine with two fixed speed settings, one 40kts and the second 24-26kts in different versions. USET-80 had no wire, all settings set before launch. TEST-71 has wire guidance, so I think it's quite possible that speed setting can be selected by wire command, switched between those two hard set values. I would make it two hard-set values (40 and 25kts) but changeable during run (so speed up on active enable and slow down on passive enable). On the other hand, the TEST-71 guidance is described as "2D" and I'm not sure what this means... would it be "course only" and not depth ? But why ? Grrrr... I know now that the PDF pages I have are from Russian Arms Catalog (relased by Military Parade Int?), but the source text is in Russian and the english text is just an automated translation and is translated so badly that I can't clearly understand what it means...
Something like: "
Designed to attack submarines, the TEST-71MKE torpedo is launched from submarines.
The warshot configuration of the torpedo comprises a homing system, impact and proximity fuzes, warhead section, disposable silver-zinc battery, control devices, electronic package, torpedo guidance wire reel, electric propulsion motor, and towed guidance wire reel. The torpedo remote guidance, homing, as well as course, depth and list control systems provide for a 2-D
maneuvering of the weapon, steer it to the proximity exploder activation zone or ensure a direct hit on the target. Two exploders detonate the weapon's explosive charge. The torpedo's propulsion plant is so designed that the weapon leaves no wake when it runs, and maintains permanent speed and range regardless of the running depth. The torpedo has two running speed modes."
If I knew how to paste Russian original text in readable form here, maybe someone could translate it correctly... O yeah, I know:
On chinese site there is: "The operator can manually switch the torpedo to an alternative target during midcourse, or control the torpedo to manoeuvre in two axes." Two axes would mean course AND depth, right ?? But what would be 3 axes then ??? course depth and speed ? Or maybe two axes means one plane (horizontal) so course only ? Grrr.. :-/