determining target speed when abeam

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greyrider! All that said: I generally just aim the boat within 1000 meters; dredge up some ol' pheasant-hunting wing it techniques and use steam eels on high speed generally from within the convoy with a good overlap so if I miss one it often hits another. Down-the-throat and directly-aft shots are useful too; no calculations needed...other than recollecting the eel's arming-travel distance...300 meters. In SHV I did get 'put to it' though against a speedy Battle-cruiser at 4,000+ meters off the Spanish Coast and put a 4-eel salvo to it at 30 knots; one eel was electric so I downed the steamers' speed to 30 accordingly. BEHOLD! two out of four hits crippled the beast sufficiently to allow follow-on shots to finish her. By put to it; I was out of time for the mission requirement and so took a shot I would not otherwise consider. &gets it done when put to it (key to enlarge diagrams)