I was crusing down past Freetown in my IXC/40, on my way to my patrol grid at the southern tip of Africa. Like you I'd run submerged during the day, then I'd surface about midnight to re-charge and submege about 5am.
I had metox, it was a pitch black night, and not only was an aircraft spotted but it was heading straight for me. It must have had centrimetric radar (which metox couldn't pick up). I manned the flak guns and shot the sod down.
I know I should have dived again but my batteries needed re-charged so I stayed on the surface. Sure enough along came another aircraft - which I also shot down. I decided I'd risk recharging at daylight and stayed under.
I've noticed with the slower diving IXC's, and with my one and only patrol in a IX-D2, that you just don't have time to dive. The one time I did a crash dive a bomb destroyed all three of my flak guns!
I too prefer the IX boats. The areas you patrol have zero to no warships. They do have seemingly massive air coverage though, but with care they aren't as much a problem as convoy escorts.
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