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Flood Ports - Info rquired on TypeVII flood ports

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Postby Diane Paterson » Thu Feb 02, 2006 10:42 pm

I'm wondering about the mechanism by which the Type VIIs flooded the MBTs. Both Jeff LaRue and I agree that the ports had doors but we don't have any pix showing the doors in the open position.
Anybody out there who might shed some light on this?
I'm currently building a 1/72 U-552 and I want to understand as much as I can about how the boat functioned so I can build it as true to life as possible.




Edited By Diane Paterson on 1138934583
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Postby tabledancer » Fri Feb 03, 2006 4:30 am

You might want to look at the great article by Don Prince in the March 2005 Report to get some ideas on the problem.It looks to me like the intake of water into the b/ts was controlled by valves in the bottom of the tanks.
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Postby KOEZE » Fri Feb 03, 2006 5:39 am

Check out my [U]-995 gallery http://album.zoom.nl/user/KOEZE/U-995/ . It has high res closeups of the ballast tank flood valves. They're closed but you may be able to see how they worked. I believe the recess in the keel allowed them to hinge.

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Postby KOEZE » Fri Feb 03, 2006 5:40 am

You'll need a password "subcommittee" to get in.
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Postby Diane Paterson » Fri Feb 03, 2006 5:30 pm

Dear Koeze:

Thanks for the feedback. On closer inspection of your pix, I realized that what appeared as a grating under a rectangular plate was actually a series of bolt heads attaching the flood valve door frame to the hull. I agree that the hinges must have been along the inboard edges of the flood valve doors. I think that I will be able to model the arrangement quite well.


Diane Paterson :)
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Postby KOEZE » Sat Feb 04, 2006 3:10 pm

[url=http://]Flood door hinges[/url]


On this photo you can see the hinges quite clearly.

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Postby KOEZE » Sat Feb 04, 2006 3:12 pm

Sorry link does not work. Try this one.
http://album.zoom.nl/user/KOEZE/U-995/499685
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Postby Diane Paterson » Sat Feb 04, 2006 3:21 pm

Dear Koeze:

Unfortunately, I can't speak Greman so I can't negotiate the web site you provided. Can you place the image in question on the message board? :(

Diane P.
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Postby KOEZE » Sat Feb 04, 2006 4:13 pm

Drop me an email at ej.koeze(at)hccnet.nl and I'll mail them to you.

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Postby rokket » Mon Feb 06, 2006 5:03 am

Koeze, thanks for the pix...I've only seen the usual 995 shots, none with the great close-up details! Very nice.
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Postby JWLaRue » Mon Feb 06, 2006 12:51 pm

...whether or not they're bolt heads, I do think it is quite likley that there is some sort of grating beneath those hinged doors. It would make sense as a means to keep FOD out of the ballast tanks.

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Postby Mylo » Mon Feb 06, 2006 2:29 pm

I'm surprised how rough the pressure hull appears to be. It looks more like concrete. Is this a result of it's age or did the boats roll off the docks like that when they were new ?

Fantastic photos showing this kind of detail.

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Postby JWLaRue » Mon Feb 06, 2006 6:07 pm

Almost certainly a combination of age (pitting from rust) and possibly paint (repair/patches). When new, the steel was quite smooth.

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