a quick reference sheet so you know what blueprints that island up ahead will give you.

torps move at about 50 m/s

Means that at radar max range of 10km, a 200 sec activation delay will have them activate just before they go out of range. Again at max zoom out, each 'ring' on the radar is about 50 seconds of delay.

at the 'default' radar range of 5km, each ring is 25 seconds of delay, with the max range being 100 seconds.

Inital turn takes time. about 20 seconds for a 90 degree turn.

Note that noisemaker torpedos stay active from the moment you fire untill the activation delay, so you will usually want the activation delay maxed out.