[jorgegonzalito]

Originally Posted by Aktungbby

AS I recollect, 7 knots under water on batteries is top speed attainable. If your on the schnorkel and only at a similar speed that's because 6 knots is the limit! https://en.wikipedia.org/wiki/Submarine_snorkel Bottom line: if SH IV is doing 6 knots that's realistic immersion in the game BBY... Twixt brökken tubes, eardrüms, and telltale 'schnorkel feathers': orders from BdU! Additionally, anything above seven knots would cause a raised periscope vibrate so badly as to be unuseable. As IXD2's were used exclusively in the far Southern Atlantic and Indian ocean, far from home, a cracked periscope tube would spell doom to the long-range mission .
Keep it at 6 and 'mind yer six' when using the schnorkel. https://www.uboat.net/allies/documents/usaaf_asw3.htm THE FIRST ATTACK ON YOUR BOAT, WITH 'SCOPE AND SCHORKEL RAISED, WILL LIKELY BE UP YOUR '6' BY A LIBERATOR AT 50' OFF THE
SURFACE...'

I was unaware of everything you tell me about the subject. Snorkels were obviously not the panacea that solved the problem, but at least they could perhaps recharge the batteries while diving without attracting too much attention. How to know (in SH4) if at 6 knots the submarine is sailing submerged with diesel or electric engines? I suppose that with the option of limited batteries you could check if they recharge, or on the contrary they discharge. Thank you very much for your detailed answer! It's amazing what I'm learning here every day about submarines!