Search found 429 matches

by Bill Jurens
Wed Jan 02, 2008 4:15 pm
Forum: The Wreck of the Bismarck
Topic: Bismarck Wreck: Main Gun Barrels
Replies: 16
Views: 17006

My job in 2001

I visited the wrecks of both Hood and Bismarck as part of the 2001 ITN expedtion to locate the wreck of Hood. I had, some years before, written and published a fairly long paper analyzing the loss of Hood, and in addition had edited and illustrated several paper on the loss of Bismarck. My status as...
by Bill Jurens
Sun Dec 30, 2007 2:44 am
Forum: The Wreck of the Bismarck
Topic: Bismarck Wreck: Main Gun Barrels
Replies: 16
Views: 17006

hump in mud

I can try to find a couple of turret images, but it may take a while. The forward part of the turret was usually not very visually interesting, and so was passed over quite a bit.

Bill Jurens
by Bill Jurens
Sat Dec 29, 2007 10:23 pm
Forum: The Wreck of the Bismarck
Topic: Bismarck Wreck: Main Gun Barrels
Replies: 16
Views: 17006

No trouble at all...

I think you may have misunderstood (which means that I did not write clearly enough...) One does not see a gun barrel six to ten feet long, one sees a 'hump' in the mud -- and sometimes the actual exterior of the gun tube -- extending outward from six to ten feet from the faceplate. The rest of the ...
by Bill Jurens
Thu Dec 27, 2007 5:14 pm
Forum: The Wreck of the Bismarck
Topic: Bismarck Wreck: Main Gun Barrels
Replies: 16
Views: 17006

To Martin French

Hello Martin: My general views on debris field analysis -- or attempts at same -- are given in the previous memo. That being said, if you would like to send me pictures of the items you are trying to identify, I might be able to help. The ROVs give you a lot more bottom time than the MIRs do, which ...
by Bill Jurens
Thu Dec 27, 2007 5:04 pm
Forum: The Wreck of the Bismarck
Topic: Bismarck Wreck: Main Gun Barrels
Replies: 16
Views: 17006

Debris fields and Turret Backs

There has been, so far as I know, no real attempt to map the debris fields. I don't think that such a survey would reveal anything of real value; even if one could identify and locate each piece in the debris field individually, it remains unclear -- at least to me -- exactly what useful information...
by Bill Jurens
Thu Dec 27, 2007 5:06 am
Forum: The Wreck of the Bismarck
Topic: Bismarck Wreck: Main Gun Barrels
Replies: 16
Views: 17006

Gun turrets and gun tubes

I don't have any good images of the gun tubes at hand, although I could probably find something by plowing through five or six hours of videotape. Honestly, there is nothing much to be seen; one sees at best perhaps the upper (actually lower) quarter of the tube for a distance of perhaps six to ten ...
by Bill Jurens
Sun Dec 23, 2007 4:34 pm
Forum: The Wreck of the Bismarck
Topic: Bismarck Wreck: Main Gun Barrels
Replies: 16
Views: 17006

Gun Barrels

The lower portions of some of the gun tubes close to the turret proper can be seen above the mudline on one or two of the turrets. All four turrets have been found.

Bill Jurens
by Bill Jurens
Fri Dec 21, 2007 7:31 pm
Forum: The Wreck of the Bismarck
Topic: Secondary Turret, Forward Turret, Starboard side
Replies: 14
Views: 11539

Hits on gun mounts

Yes, each of the secondary gunmounts has at least one 'clean' hit, often through the face plate. Some have exit holes while others do not. Some have been hit more that once.

Bill Jurens
by Bill Jurens
Fri Dec 21, 2007 5:29 pm
Forum: The Wreck of the Bismarck
Topic: Secondary Turret, Forward Turret, Starboard side
Replies: 14
Views: 11539

Caption and photo source...

Your description of images of a particular mounting with an associated caption do not indicate exactly where you saw the material in question. Sometimes these things are not very reliable. The source counts for a lot. I've looked at most -- actually all -- of the Bismarck tapes in detail over the ye...
by Bill Jurens
Thu May 10, 2007 1:50 pm
Forum: The Wreck of the Bismarck
Topic: Bismarck's Holding Bulkhead
Replies: 1
Views: 7610

Bismarcks holding bulkhead

I examined parts of the holding bulkhead etc. during the 2001 expedition, and was able to examine that same area in much more detail using tapes from the Cameron expedition, once in 2003 and once in 2006. The Cameron tapes are much more detailed, as his small 'bots' could swim right inside the side ...
by Bill Jurens
Thu May 03, 2007 5:10 am
Forum: Bismarck General Discussion
Topic: Bismarck: Scuttled or Sunk?
Replies: 206
Views: 65555

citation

The referenced paper, though now some what out of date, remains a fairly good summary. Many of the drawings are incorrectly attributed to Thomas G. Webb, when I actually did them myself. This includes the detailed plan of the inside of the conning tower.

Bill Jurens
by Bill Jurens
Wed May 02, 2007 1:48 pm
Forum: Bismarck General Discussion
Topic: Bismarck: Scuttled or Sunk?
Replies: 206
Views: 65555

Magazine flooding

Why would the magazines be flooded BEFORE an impending action?

Bill Jurens
by Bill Jurens
Wed May 02, 2007 3:17 am
Forum: Bismarck General Discussion
Topic: Bismarck: Scuttled or Sunk?
Replies: 206
Views: 65555

Armor Penetrations, etc.

The Ballard expedition never really got a close look at the conning tower of Bismarck, primarily because he was towing a sled which obtained mostly vertical or near vertical views while the real damage was on the sides. There are at least two heavy caliber hits on the conning tower. They did not pen...
by Bill Jurens
Fri Apr 27, 2007 2:02 pm
Forum: Bismarck General Discussion
Topic: Bismarck: Scuttled or Sunk?
Replies: 206
Views: 65555

Pointer errors, etc...

In response to the two previous questions: The "pointer" in this context can be either human or automatic. In any case, there will be some error involved in firing at exactly the right time while the gun is moving vertically, both due to delays in the sensors and the mechanisms. Exactly what this er...
by Bill Jurens
Fri Apr 27, 2007 4:51 am
Forum: Bismarck General Discussion
Topic: Bismarck: Scuttled or Sunk?
Replies: 206
Views: 65555

Dispersion in height

It is very difficult to hit a target close aboard with a big gun when the ship is rolling. Some "back of the envelope" calculations might help. Assume that the ship is rolling 5 degrees to each side and that the period of roll is 12 seconds. This corresponds to an average roll rate of about 0.833 de...