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by Bill Jurens
Thu Nov 18, 2021 6:53 pm
Forum: Bismarck General Discussion
Topic: Range of Bismarck's guns
Replies: 17
Views: 1220

Re: Range of Bismarck's guns

You are correct, but the range difference is usually of practical insignificance, as one can easily adjust for ship motion effects by simply adjusting the angle of departure. At extreme ranges, when the angle of departure (at least in theory) approaches 45 degrees, it might be possible for this to m...
by Bill Jurens
Sun Nov 14, 2021 5:19 pm
Forum: Bismarck General Discussion
Topic: Range of Bismarck's guns
Replies: 17
Views: 1220

Re: Range of Bismarck's guns

Tactical issues indeed. So long as the firing ship is engaging off the beam or nearly so, getting a good solution on a target ship on any approaching constant course and speed -- which is the most likely case -- should be relatively straightforward. (the target ship usually remains on a steady cours...
by Bill Jurens
Fri Nov 12, 2021 4:26 pm
Forum: Bismarck General Discussion
Topic: Range of Bismarck's guns
Replies: 17
Views: 1220

Re: Range of Bismarck's guns

I'll take these figures as written, thought it's worth noting that it's generally quite difficult to hit an end-on target in a stern chase, much easier to hit a broadside target at the same range. So, had targets been broadside, hits at longer ranges might have been expected.

Bill Jurens
by Bill Jurens
Mon Nov 01, 2021 4:51 am
Forum: Bismarck General Discussion
Topic: Bismarck - 24 Hours to Doom
Replies: 8
Views: 397

Re: Bismarck - 24 Hours to Doom

I haven't seen this particular treatment, but can certainly confirm that the historical accuracy of many of these recent 'documentaries' -- if one can dignify them as such in the first place -- is often abysmally low. One problem is that we are now entering a rather brief historical 'window' where m...
by Bill Jurens
Thu Oct 21, 2021 4:22 pm
Forum: Naval History (1922-1945)
Topic: Gun range for 8' British cruiser guns?
Replies: 57
Views: 2021

Re: Gun range for 8' British cruiser guns?

When track chart reconstruction is being attempted, two other factors -- especially in 'chases' should be kept in mind, particularly with respect to WWII technology. One is that visual interference by 'own smoke' can be of some consequence, particularly if firing directly astern or nearly so, insofa...
by Bill Jurens
Sun Oct 17, 2021 8:38 pm
Forum: Naval History (1922-1945)
Topic: Gun range for 8' British cruiser guns?
Replies: 57
Views: 2021

Re: Gun range for 8' British cruiser guns?

Kev D wrote on Sat Oct 16, 2021 10:21 am. I have inserted my own replies in italics between his quotes and questions... "First and foremost, thank your very much for your input, it is much appreciated!" You are more than welcome... "Re your above, given she lost all power upon the fat...
by Bill Jurens
Sat Oct 16, 2021 5:50 am
Forum: Naval History (1922-1945)
Topic: Gun range for 8' British cruiser guns?
Replies: 57
Views: 2021

Re: Gun range for 8' British cruiser guns?

It is extremely unlikely that the bearing of the turrets as found on the wreck has much to do with the final bearing of targets during the last phases of the surface action. It is likely, almost certain, that the ship would have lost all -- or nearly all -- way just before sinking, and in such situa...
by Bill Jurens
Sat Oct 16, 2021 5:46 am
Forum: Naval History (1922-1945)
Topic: Gun range for 8' British cruiser guns?
Replies: 57
Views: 2021

Re: Gun range for 8' British cruiser guns?

While the final bearing of the turret may be correct, it's unlikely to be correlated with the actual geometry of the action as the ship, as it lost way and sank in what was probably a nearly stationary situation, would likely have rotated considerably from it's original path. So far as the elevation...
by Bill Jurens
Thu Oct 14, 2021 6:10 pm
Forum: Naval History (1922-1945)
Topic: Gun range for 8' British cruiser guns?
Replies: 57
Views: 2021

Re: Gun range for 8' British cruiser guns?

Earlier in this thread, I wrote: "It is honestly hard (for me) to conceive of any situation where guns would be elevated to 50-70 degrees for surface targets c. 18000 yards away. The same range can be reached quite easily at much lower angles of departure, much more efficiently. Bill Jurens.&qu...
by Bill Jurens
Wed Oct 13, 2021 11:06 pm
Forum: Naval History (1922-1945)
Topic: Gun range for 8' British cruiser guns?
Replies: 57
Views: 2021

Re: Gun range for 8' British cruiser guns?

It is honestly hard (for me) to conceive of any situation where guns would be elevated to 50-70 degrees for surface targets c. 18000 yards away. The same range can be reached quite easily at much lower angles of departure, much more efficiently.

Bill Jurens.
by Bill Jurens
Wed Oct 13, 2021 4:36 pm
Forum: Naval History (1922-1945)
Topic: Gun range for 8' British cruiser guns?
Replies: 57
Views: 2021

Re: Gun range for 8' British cruiser guns?

My apologies for the confusion. My mistake; as I suspected I might, I made a typing error. Variables are Angle of Departure (deg), Range(yds), Striking Velocity (f/s), Angle of Fall (deg),Time of Flight(sec), and Maximum Ordinate (ft). I am wondering what this information might be used for, as refin...
by Bill Jurens
Tue Oct 12, 2021 11:29 pm
Forum: Naval History (1922-1945)
Topic: Gun range for 8' British cruiser guns?
Replies: 57
Views: 2021

Re: Gun range for 8' British cruiser guns?

This post seems to be 'drifting' a bit, and it seems a previous posting of mine seems to have gone astray. The ballistics are relatively easy to calculate in simple form, i.e. neglecting the probable inability of the projectile to properly 'trail' at the summit. These calculations can be done, but w...
by Bill Jurens
Mon Oct 11, 2021 9:24 pm
Forum: Bismarck General Discussion
Topic: Range of Bismarck's guns
Replies: 17
Views: 1220

Re: Range of Bismarck's guns

Maximum ranges can be somewhat tricky to define, as they can vary depending upon atmospheric conditions, the direction the gun is fired (due to earth rotation effects), and gun wear, which slowly reduces initial velocity. Also, the range in miles can be measured in both statute miles (5280 feet) or ...
by Bill Jurens
Sun Oct 10, 2021 5:59 pm
Forum: Naval Weapons
Topic: Questions regarding to the performance of German 20.3cm guns
Replies: 6
Views: 794

Re: Questions regarding to the performance of German 20.3cm guns

My thanks and appreciation for the last few postings here, which have helped to considerably clarify some of the points under discussion.

Bill Jurens
by Bill Jurens
Thu Oct 07, 2021 5:22 pm
Forum: Naval Technology
Topic: TDS of HMS Hood
Replies: 16
Views: 993

Re: TDS of HMS Hood

While the discussion is interesting, I'd caution correspondents to exercise caution in posting extensive scans, etc. of specifically copyrighted material, especially if the source is not mentioned. In this case the material is clearly from John Roberts' "Anatomy of the Ship -- Hood. One scan ma...