Search found 319 matches

by Bill Jurens
Sat Jan 05, 2013 12:50 am
Forum: Naval Weapons
Topic: Triple and quatruple turrets
Replies: 54
Views: 8351

Re: Triple and quatruple turrets

To Alecsandros: Thank you for this. I am glad to know that my papers are still of interest; sorry to be reminded that I have nearly forgotten some of them. There is indeed a slight misinterpretation I think; although all ships were to fire in this practice, a little later on it is noted that this wa...
by Bill Jurens
Fri Jan 04, 2013 6:03 pm
Forum: Naval Weapons
Topic: Triple and quatruple turrets
Replies: 54
Views: 8351

Re: Triple and quatruple turrets

To Alecsandros: I read your post regarding USN gunnery exercises with considerable interest. I have the the reports on all or most of the inter-war exercises here, but don't recall these particular ones; certainly a large number of battleships simultaneously firing at a single target would be unusua...
by Bill Jurens
Sun Oct 21, 2012 8:43 pm
Forum: Naval Propulsion
Topic: Fuel consumption Bismarck
Replies: 74
Views: 17277

Re: Fuel consumption Bismarck (correction)

The last line of my previous should, of course, say that the Midway class layout was derivitave of, but not identical to, the MONTANA layout...

Bill Jurens
by Bill Jurens
Sun Oct 21, 2012 8:33 pm
Forum: Naval Propulsion
Topic: Fuel consumption Bismarck
Replies: 74
Views: 17277

Re: Fuel consumption Bismarck

An interesting and informative graph. All other issues aside, this presentation clearly illustrates the US design preference -- at least from c. 1930 on -- to design hulls for maximum efficiency at cruising speed rather than for maximum top speed. This is also reflected in USN destroyer designs, whe...
by Bill Jurens
Tue Jul 24, 2012 10:43 pm
Forum: Hypothetical Naval Scenarios
Topic: Washington
Replies: 229
Views: 17660

Re: Update on paper etc.

Hello Alecsandros: I see where you are coming from now. My apologies if I came across as a bit defensive; I was fairly severely 'burnt' by the forward magazine explosion fiasco some years ago, and am certainly reluctant to revisit those sorts of speculations (including "Prinz Eugen did it" and "It w...
by Bill Jurens
Sat Mar 17, 2012 10:42 pm
Forum: Naval Technology
Topic: Comparing Montana's bomb deck armor to Yamato's Question?
Replies: 5
Views: 3411

Re: Comparing Montana's bomb deck armor to Yamato's Question

For what it is worth, the actual weather deck plating for the Montana design consisted of two 45# STS plates with no substrate below. The entire weather deck was covered except for a portion forward of the muzzles of the guns of Turret I. There was an irregular transition in thickness for a space of...
by Bill Jurens
Fri Sep 30, 2011 2:54 am
Forum: Naval Technology
Topic: Frame Spacing
Replies: 9
Views: 5858

Re: Frame Spacing

For a variety of reasons you will generally find that the shell construction of merchant ships tends to be somewhat more robust than that of warships of similar size. Hood's side shell plating was typically 25#, about 0.625" thick, about the same at that used on the Iowa class ships and on Bismarck/...
by Bill Jurens
Wed Sep 28, 2011 1:54 am
Forum: Naval Technology
Topic: Question for Bill Jurens on his South dakota pic
Replies: 2
Views: 1875

Re: Question for Bill Jurens on his South dakota pic

This drawing is one of a series I did in suport of Strafford Morss' articles in Warship International magazine a few years ago. Part I of "The Washington Naval Treaty and the Armor and Protective Plating of USS Massachusetts" was published in Warship International No 3, 2006 on pages 273-309. Part I...
by Bill Jurens
Tue Sep 27, 2011 4:17 am
Forum: Naval Weapons
Topic: Projectile fire questions
Replies: 28
Views: 5519

Re: Projectile fire questions

Cuttlefish wrote: "I am here with some questions, as I think there will probably be someone here who knows this matter. The subject is (roughly) the venerable Royal Navy 15" gun. What altitude did the shell reach at the top of its loft, if fired at about a 22º elevation angle, for example? What migh...
by Bill Jurens
Sun Apr 10, 2011 1:59 am
Forum: Bismarck General Discussion
Topic: Bismarck: Scuttled or Sunk?
Replies: 206
Views: 62126

Re: Bismarck: Scuttled or Sunk?

Herr Nilsson has it right. I found this particular failure quite confusing when I first examined the wreck in 2001; the stern was broken off very cleanly, but there was a narrow 'shelf' running around the entire perimeter of the break, i.e. the break actually took place a short distance abaft the af...
by Bill Jurens
Mon Feb 21, 2011 3:06 am
Forum: Naval Weapons
Topic: Ranging of guns
Replies: 7
Views: 1450

Re: Ranging of guns

A good point. This is commonly referred to as an error resulting from "trunnion tilt". It's quite difficult to correct for, which is one reason why ships tended to have such low hitting rates in stern chases when the range, if it was changing at all, was typically changing only very slowly. Almost a...
by Bill Jurens
Mon Feb 21, 2011 2:50 am
Forum: Bismarck General Discussion
Topic: Searchlight Use
Replies: 16
Views: 3142

Re: Searchlight Use

The USN found that seachlights were almost useless in firing against a target that was firing against you; the haze of spray thrown up by enemy 'shorts' quickly reduced one's own visibility to near-zero. And, of course, they also provided an excellent aiming point for the enemy. If an enemy ship usi...
by Bill Jurens
Fri Feb 18, 2011 6:55 pm
Forum: Naval Weapons
Topic: Ranging of guns
Replies: 7
Views: 1450

Re: Ranging of guns

Dispersion in range could be reduced in a number of ways. Dispersion in deflection was rarely large enough to represent a serious concern. In some systems, individual turrets were driven in azimuth so as to converge upon a target at a given range, but this meant slewing the entire turret, not adjust...
by Bill Jurens
Thu Jan 20, 2011 5:03 pm
Forum: Naval History (1922-1945)
Topic: Battleship Vittorio Veneto
Replies: 100
Views: 18350

Re: Battleship Vittorio Veneto

Regarding dispersions, etc., I would recommend reading the lengthy two-part article Brad Fischer and myself did for Warship International about four years ago, which specifically covers the gunnery of the 'fast battleships) (BB-57 onwards). These papers were specifically written to extend my previou...
by Bill Jurens
Sat Nov 06, 2010 4:23 pm
Forum: Naval Weapons
Topic: sectional drawings major naval projectiles
Replies: 4
Views: 1155

Re: sectional drawings major naval projectiles

The 16" Mark 8 was manufactured by three different companies, Midvale, Crucible, and Bethlehem, and was provided in at least eight different 'mods', each of which varied slightly from the others, especially in internal geometry. (External geometry and weight etc. had to be maintained for ballistic c...