Jan, interesting pic of the underside of the hatch. It seems to be a late-war boat much like U-995.
The sideways opening hatches nearest the stern look about what I had surpmised, with one diagonal brace although it's not possible from the pic to tell if the brace is wood or steel. I'd guess steel but does anybody know?
Further forward there seems to be a hatch that is solid, but in a position that would stop them accessing the spare torpedo at the same time as the torpedo loading hatch is open. That doesn't make sense! Or am I looking at it wrong?
Again, there's those rectangular extensions on either side of the casing. Does anybody know what they are? I've never seen a pic of them on U-711 (the one I'm building) but they would be very hard to cut off and remake the casing underneath without showing.
Another question. On this boat, as on U-995, the domed pressure hatches for the inflatables are exposed on top of the deck. But on U-711, even though the domes aren't there, there are wooden hatches in about the same locations. Are these wooden hatches just an older version of the stowage for the inflatables? And if so, why did the hatches move up to the open deck later on? Was the reason that the early inflatables were smaller?
Also, FYI for people, I've seen a couple of pix of the portside at the bow (sorry, I can't find them again) where there seems to be a flat sheet of metal behind the drainage holes going from the start of theinflatable hatches to the back end of the inflatable hatches. (holes 10-17). I have not seen anything similar on the stbd side. The only thing I can think of is that this flat sheet must be a sort of container for the inflatable pressure canisters, probably as something to make it slightly more hydrodynamic under the deck.
The flat sheet seemed to be the same colour as the outside casing, because it would be very easy to see.
However, I've seen other boats that do not show this flat piece of fairing. Either it just painted a darker colour on some boats (the same as the underwater parts of the hull?) and thus didn't show up on photos, or it was something that not all boats had for some reason. (Maybe the inflatable canisters were all separate and less hydrodynamic in those boats?)
Any comments?