Mk 37 swim out?
 

So I've noticed when launching torpedoes at close range vessels when not in their baffles they tend to hear the launch transients and immediately go evasive, makes sense except for the Mk 37... While I believe it can be launched conventionally the torpedo is 2" smaller than the tube to facilitate swim out in which case there shouldn't be any transient, right?

Currently in game all torpedoes seem to launch at cruise velocity, which in a way suggests that the Mk 37 is swimming out since a standard launch would eject it at high speed and then it would slow to cruise.

Am I crazy or does this make sense to you guys? If so, and if implemented in the game, this could add an advantage to the otherwise sad performance of the early wire-guided weapon.

--PS, I suppose it's also possible they're hearing the torpedo screws in cruise rather than the launch itself. Not sure how quiet those props are...

Correct, Mk37 is a swim-out fish. Here are the stats from the weapon config file.

WeaponObjectReference=usn_mk37
WeaponSprite=weapons/sprites/usn_mk37_sprite
WeaponType=TORPEDO
Warhead=225
SurfaceLaunched=FALSE
SwimOut=TRUE
WireGuided=TRUE
WireBreakOnLaunchProbability=0.1
WireBreakSpeedThreshold=15
RangeInYards=23000
RunSpeed=17
ActiveRunSpeed=26
TurnRate=20
SensorAngles=60,15
SensorRange=950
WeaponNoiseValues=120,230
MaxPitchAngle=25
HomeSettings=PASSIVE,ACTIVE
AttackSettings=SNAKE,LEFT,RIGHT
DepthSettings=LEVEL,SHALLOW,DEEP
MinCameraDistance=0.5

So I guess they're just hearing the torpedo itself?

I think it might be the launch and Mk 37's swim out isn't working properly though I'm not entirely sure.

I've had a Mk37 on a wire in a stern chase with a November which is just fast enough to outrun it. I had the torpedo on active so I switched it to passive and the November immediately began to turn allowing the torpedo to catch up and hit it.

That would assume the November could only hear it in the baffles when it was active. Having said that it was a pretty dumb thing to do. Active or not I wouldn't be turning my sub till I heard it detonate.