Search found 787 matches

by Bill Jurens
Fri May 28, 2021 10:43 pm
Forum: Bismarck General Discussion
Topic: Famous picture showing Bismarck down by the bow
Replies: 9
Views: 362

Re: Famous picture showing Bismarck down by the bow

My own opinion is 'no'. There is some damage on the portside forward which appears as though some material might have been welded in place, and there are a few holes and damaged areas on the starboard side which may (or may not) correspond with an exit hole (or holes) close to what would have been t...
by Bill Jurens
Fri May 28, 2021 6:00 pm
Forum: Bismarck General Discussion
Topic: Famous picture showing Bismarck down by the bow
Replies: 9
Views: 362

Re: Famous picture showing Bismarck down by the bow

I just did a bit more photogrammetric work on the photo in question. If you take the horizon to be horizontal (a reasonable assumption given the sea conditions), you will find that the masts come out to all intents and purposes dead vertical, which would suggest the ship is hardly trimming at all. A...
by Bill Jurens
Fri May 28, 2021 5:13 pm
Forum: Bismarck General Discussion
Topic: Famous picture showing Bismarck down by the bow
Replies: 9
Views: 362

Re: Famous picture showing Bismarck down by the bow

I suspect that you are essentially correct. My feeling has always been that the photographer 'snapped' the photo when the ship was in one of its most extreme positions, i.e. one that was visually the most interesting, and that photos taken at random would not show nearly so much apparent trim by the...
by Bill Jurens
Thu Apr 22, 2021 8:46 pm
Forum: Bismarck General Discussion
Topic: Raumotters to the Rescue
Replies: 26
Views: 970

Re: Raumotters to the Rescue

Trying to synchronize propeller thrusts, rudder forces (which were probably uncertain and variable depending upon how much rudder was actually there, etc.), wind forces, sea forces, and paravane thrusts (which would seem to be difficult to regulate with precision) would probably be impossible, espec...
by Bill Jurens
Mon Apr 19, 2021 2:44 am
Forum: Bismarck General Discussion
Topic: bismark-after torpedo hit
Replies: 203
Views: 13770

Re: bismark-after torpedo hit

I haven't done any calculations, but my suspicion is that paravanes even if streamed at speed would not be able to exert enough transverse force to make any significant difference. They were, after all, only intended to move minesweeping wires outboard and to support a fairly light cable to cut the ...
by Bill Jurens
Tue Apr 13, 2021 1:25 am
Forum: Bismarck General Discussion
Topic: bismark-after torpedo hit
Replies: 203
Views: 13770

Re: bismark-after torpedo hit

The tug idea is interesting, but I doubt very much if even big salvage tugs could have made much difference. Towing speeds would be too slow. Most tug-work took place in still-water harbors at very slow speeds. Pushing on the bow of the Queen Mary at three-knots in harbor is very very different than...
by Bill Jurens
Fri Apr 09, 2021 8:21 pm
Forum: Bismarck General Discussion
Topic: bismark-after torpedo hit
Replies: 203
Views: 13770

Re: bismark-after torpedo hit

Actually, now that I think about it more, there was one set of cases where ships were expected (rarely) to operate astern. Some early U.S. Navy aircraft carriers were, for a brief time, equipped with arresting gear forward as well as aft, the idea being that if damage to the flight deck occurred aft...
by Bill Jurens
Fri Apr 09, 2021 5:24 pm
Forum: Bismarck General Discussion
Topic: bismark-after torpedo hit
Replies: 203
Views: 13770

Re: bismark-after torpedo hit

As a general rule, ships of that era were simply not designed to steam astern at any significant speed at for any significant time, so it's simply not a 'design case'. Basically, why would anybody want to do that? Even tugs, which spent a lot of time under astern power, never used that as any sort o...
by Bill Jurens
Fri Apr 09, 2021 5:23 pm
Forum: Bismarck General Discussion
Topic: bismark-after torpedo hit
Replies: 203
Views: 13770

Re: bismark-after torpedo hit

deleted duplicate post from myself

Bill Jurens
by Bill Jurens
Wed Apr 07, 2021 7:44 pm
Forum: Bismarck General Discussion
Topic: bismark-after torpedo hit
Replies: 203
Views: 13770

Re: bismark-after torpedo hit

I corresponded with the Baron, who lived here in Toronto, Canada, several times, and talked to him on the phone once regarding gunnery aspects and big-gun dispersion. A very nice gentleman indeed, but -- one must remember -- quite literally a professional diplomat who chose his words very carefully ...
by Bill Jurens
Fri Mar 26, 2021 11:23 pm
Forum: Naval Technology
Topic: Idiots guide to....
Replies: 13
Views: 1088

Re: Idiots guide to....

Mr. Mercer wrote: "In other threads some of you have very patiently explained to me why a one ton bomb dropping vertically from an aircraft is more likely to penetrate deck armour than a one ton shell arriving at an angle, I regret that I'm still a bit puzzled on this, at Pearl Harbour I believe it ...
by Bill Jurens
Tue Mar 23, 2021 7:22 pm
Forum: Naval Technology
Topic: Idiots guide to....
Replies: 13
Views: 1088

Re: Idiots guide to....

No 'blowing out of the water' required, or appropriate. Certainly the precise location of a particular shell hit, except in very unusual circumstances is largely a random process, which one might well characterize as being represented by 'luck'. What is little appreciated is the inherent variability...
by Bill Jurens
Mon Mar 22, 2021 1:55 am
Forum: Naval Technology
Topic: Idiots guide to....
Replies: 13
Views: 1088

Re: Idiots guide to....

I have to admit that I'm somewhat skeptical that the Naval Armor and Ballistics program "...is very useful and educational", at least for long-range naval gunfire. It appears to (still) be based on MCTRAJ, a small-arms ballistic program which, due to scaling issues, really doesn't model big artiller...
by Bill Jurens
Sun Mar 21, 2021 8:38 pm
Forum: Bismarck General Discussion
Topic: bismark-after torpedo hit
Replies: 203
Views: 13770

Re: bismark-after torpedo hit

I would tend to agree that the idea of using a hangar door as a rudder of some sort was also more or less a fantasy, especially if one were trying to fit such a device in heavy sea conditions, at night, and with the British in hot pursuit. It is barely possible that Bismarck might have been able to ...
by Bill Jurens
Sun Mar 21, 2021 1:43 am
Forum: Bismarck General Discussion
Topic: bismark-after torpedo hit
Replies: 203
Views: 13770

Re: bismark-after torpedo hit

I have the detailed rudder drawings of Bismarck here. As you mentioned, blowing off the rudder -- or rudder(s) represents a complete fantasy. How might one place the explosive? How much might be required? Where in the wreckage might the explosive charges be placed in order to assure separation, and ...