Search found 322 matches

by Bill Jurens
Tue Feb 08, 2005 4:56 pm
Forum: Naval Technology
Topic: Tirpitz plate results...
Replies: 63
Views: 23763

Reports

MIght I get a copy of these reports as well? I probably have them already, but do want to make sure that we are all looking at the same documentation.

e-mail is bjurens@shaw.ca

Thanks in advance...

Bill Jurens
by Bill Jurens
Sun Jan 30, 2005 10:08 pm
Forum: Naval Technology
Topic: Tirpitz plate results...
Replies: 63
Views: 23763

Armor tests

George, you seem to assume that the people doing the tests were a bunch of feeble-minded morons who couldn't (after uncounted thousands of tests) figure out how to adjust for edge and adjacency effects. Proof shooting wasn't just done "for fun", you know, and very often a great deal of money rode up...
by Bill Jurens
Sun Jan 30, 2005 12:03 am
Forum: Naval Technology
Topic: Tirpitz plate results...
Replies: 63
Views: 23763

Plate tests

The effects of shells striking near the edges of armor plates were well understood at that time, as many many test plates had been fired at and the results carefully observed. (as noted, the effects are really quite small with that type of armor/projectile combination we are talking about. The provi...
by Bill Jurens
Mon Jan 17, 2005 3:35 pm
Forum: Bismarck General Discussion
Topic: Re: "If 15" shell had exploded in POW Bridge"
Replies: 32
Views: 9970

Holes

The apparently dual exit holes was what suggested to me that the projectile itself did not detonate high order,or perhaps did not detonate at all, although two holes are certainly not incompatible with a high-order detonation.
by Bill Jurens
Mon Jan 17, 2005 6:31 am
Forum: Bismarck General Discussion
Topic: Re: "If 15" shell had exploded in POW Bridge"
Replies: 32
Views: 9970

Location of holes

I posted a reply on this several hours ago, but it seems not to have 'gone', so will rewrite. The exact position of the hit is described in various German sources, and -- as the angle of fall is known -- the position of the entrance and exit holes can be picked right off the ship's plans. From this,...
by Bill Jurens
Sun Jan 16, 2005 5:53 am
Forum: Bismarck General Discussion
Topic: Re: "If 15" shell had exploded in POW Bridge"
Replies: 32
Views: 9970

Damage

It's quite possible that the shell detonated low order. What appears to be the entrance hole is fairly clear -- I looked for it in 2001, and probably found it. I was able to inspect it again on the James Cameron tapes. The position and condition of the exit hole is somewhat less clear; although I do...
by Bill Jurens
Sat Jan 15, 2005 9:25 pm
Forum: Bismarck General Discussion
Topic: Re: "If 15" shell had exploded in POW Bridge"
Replies: 32
Views: 9970

Hits in bow

In general one tends to find little of real combat value in the bow sections of a battleship, i.e. in those sections forward of the foremost turret, less some anchor handling equipment. Occasionally, one also finds some fuel and paint stores in that area, which might constitute a minor hazard if ign...
by Bill Jurens
Wed Jan 12, 2005 6:31 am
Forum: Bismarck General Discussion
Topic: Stern section of the Bismarck - question
Replies: 116
Views: 46376

Hulls and vt fuzes

Comments to the effect that I am 'coming out to play' and or am 'now engaged' are entirely false. Honestly, I see little to no point in further pursuing this hull strength 'discussion' -- if that is indeed the appropriate word -- particularly when my repeated attempts at explanation at are clearly f...
by Bill Jurens
Wed Jan 12, 2005 1:17 am
Forum: Bismarck General Discussion
Topic: Stern section of the Bismarck - question
Replies: 116
Views: 46376

"lightly constructed Bismarck..."

The sometimes somewhat negative replies to my assessment of Bismarck as being somewhat lightly constructed with comparison to her contemporaries suggested that I should check some figures to see if they matched my intuition. Here, from a variety of sources and rounded to the nearest percent, are the...
by Bill Jurens
Tue Jan 11, 2005 3:46 pm
Forum: Bismarck General Discussion
Topic: Stern section of the Bismarck - question
Replies: 116
Views: 46376

Bismarck construction

Regarding Bismarck's construction, I can assure readers that no mirth or sarcasm, etc. was intended. I have been fortunate to have been able to visit and tour virtually all of the battleships still extant, have viewed a very large number of drawings of Bismarck and have also been extremely fortunate...
by Bill Jurens
Sun Jan 09, 2005 11:19 pm
Forum: Bismarck General Discussion
Topic: Stern section of the Bismarck - question
Replies: 116
Views: 46376

welding and impacts

Dave Saxton has, I think, done an excellent job in summarizing the situation just prior to and during the war. I've seen no better nor more accurate summary anywhere. To Javier and Ulrich: The impact speed is indeed taken to be about 20 mph, but as studies of sinking objects (albeit much smaller tha...
by Bill Jurens
Sun Jan 09, 2005 6:14 pm
Forum: Bismarck General Discussion
Topic: Stern section of the Bismarck - question
Replies: 116
Views: 46376

Welding and record keeping

I think that the problem revolving around differences in record keeping and record survival is a real one. It's likely, for example, that Japanese shipbuilders experienced welding failures too, but it's unlikely that many of the records of those failures now survives or is reasonably accessible to E...
by Bill Jurens
Sun Jan 09, 2005 1:04 am
Forum: Bismarck General Discussion
Topic: Stern section of the Bismarck - question
Replies: 116
Views: 46376

Hull problems

This topic seems -- either intentionally or accidentally -- to have be been diverted from a discussion regarding the design of stern joints on Bismarck to some sort of general investigation into the performance of USN designed hulls in typhoons, etc. There is really very little relationship here, an...
by Bill Jurens
Fri Jan 07, 2005 10:20 pm
Forum: Bismarck General Discussion
Topic: Stern section of the Bismarck - question
Replies: 116
Views: 46376

Green water

I would concur entirely with your observation. I might not have made myself entirely clear. My reference to green water was intended to refer to aircraft carriers only, where overhanging flight decks forward were in some cases pushed well out of alignment due to green water coming over the bows. Col...
by Bill Jurens
Fri Jan 07, 2005 3:58 pm
Forum: Bismarck General Discussion
Topic: Stern section of the Bismarck - question
Replies: 116
Views: 46376

Loss of Pittsburgh bow

In very brief summary, the loss of Pittsburgh's bow was attributed to a discontinuity in structural characteristics -- as I recall the keel aft of the break point was rivetted and the keel forward of the break point was welded -- and also due to poor quality welding and perhaps lack of maintenance a...