Search found 219 matches

by marty1
Sun Apr 16, 2006 12:16 am
Forum: Naval Weapons
Topic: 38,1cm Range Tables
Replies: 4
Views: 3049

Thanks Ulrich. Check your email. Let me know if you can figure out was the"/50" means.

regards
marty
by marty1
Sat Apr 15, 2006 7:44 pm
Forum: Naval Weapons
Topic: 38,1cm Range Tables
Replies: 4
Views: 3049

38,1cm Range Tables

I have a question regarding the range table image posted below. The 50% Dispersion Zone is as the "50%ige Langenstreuung" curve. There is a backslash followed by a 50 in the title of the curve that has me scratching my head. What if anything is the / 50 supposed to imply? Or -- let me try asking it ...
by marty1
Mon Mar 06, 2006 3:26 pm
Forum: Bismarck General Discussion
Topic: Photo Nh 69729 Evaluation
Replies: 39
Views: 14909

Thanks Antonio. I would like to see the uncropped versions so I can make a better range estimate. By the way your battle plot is an excellent way to convey information. I like the way you have put it together. I took a few measurements of the small photos shown on your Denmark Straights battle map. ...
by marty1
Sat Mar 04, 2006 7:36 pm
Forum: Bismarck General Discussion
Topic: Photo Nh 69729 Evaluation
Replies: 39
Views: 14909

Sorry -- just one more note about cropping. The negative is supposed to be 24mmx36mm -- see Antonio's post: http://kbismarck.org/forum/viewtopic.php?t=273&start=75 So the height to width ratio of the negetive is 24/36 = 0.6667 Both the NH 69729 & NH 69730 photos posted by Antonio have height to widt...
by marty1
Sat Mar 04, 2006 7:12 pm
Forum: Bismarck General Discussion
Topic: Photo Nh 69729 Evaluation
Replies: 39
Views: 14909

NH 69729 I used the same method for NH69729 as I just did for NH69730. The Bismarck is now a bit further away. Is this the salvo right before, or right after the salvo seen in NH 69730? Does the photo numbering tell us that NH69729 was taken before NH69730? What is the typical timing one might expec...
by marty1
Sat Mar 04, 2006 4:39 pm
Forum: Bismarck General Discussion
Topic: Photo Nh 69730 evaluation
Replies: 47
Views: 12265

I can’t do a distance measurement based upon on angular scale method, as there are insufficient numbers of foreground objects to develop a scale. However I did develop a distance estimate based upon the focal length method I detailed on another thread on this forum. First: I printed the image out. S...
by marty1
Mon Feb 13, 2006 1:57 am
Forum: Naval Weapons
Topic: Distribution of fire
Replies: 4
Views: 2574

Re: Distribution of fire

How does the distribution of fire worked? As a matter of fact how someone flotaing on a warship at certain speed and course and looking thru a fire director can hit an object at another speed and direction? No digital computers in WWI and WW2: all manual? Hi Karl: If you have not already poked arou...
by marty1
Mon Jan 30, 2006 11:13 pm
Forum: Bismarck General Discussion
Topic: Determining Distances from Photographs
Replies: 57
Views: 23935

The attached image was something I sent to Ulrich a couple months back. It is basically a solved example of the method detailed in FM21-26 & NAVFAC manuals for developing appropriate photo scales. This isn’t my “mil” scale method -- but I think I have already detailed my approach to developing a rad...
by marty1
Thu Jan 26, 2006 4:42 pm
Forum: Bismarck General Discussion
Topic: Determining Distances from Photographs
Replies: 57
Views: 23935

I agree with Mr. Jurens – particularly regarding using multiple methods to verify that one’s boundary conditions and/or problem assumptions are reasonable. I came across methodologies for determining distance and scale within photos in both a NAVFAC Manual, and an Army Field Manual – FM 21-26. These...
by marty1
Fri Dec 23, 2005 6:13 pm
Forum: Naval Weapons
Topic: Naval guns and...
Replies: 7
Views: 3164

marcelo_malara wrote:I came to the info (don´t remeber where) that the run was 400.
Has the book technical info?
Hi Marcelo:

Not so much raw technical information as much as it is an explanation of the various tools used by the RN for developing firing solutions.

Regards
Marty
by marty1
Wed Dec 21, 2005 2:04 am
Forum: Naval Weapons
Topic: Naval guns and...
Replies: 7
Views: 3164

Hi Marcelo: I am actually in the middle of reading "Dreadnought Gunnery at the Battle of Jutland". A very scholarly work. Yes I broke down and paid $115. It's good -- but I wouldn’t pay $115 for it unless I was very interested in the topic (which I am). It is -- as the title suggests -- focused excl...
by marty1
Tue Dec 20, 2005 9:03 pm
Forum: Naval Weapons
Topic: Naval guns and...
Replies: 7
Views: 3164

If you are interested in WWI era naval gunnery -- how things were done by the Royal Navy at Dogger Bank or Jutland -- you should check out Tony Lovell's "The Dreadnought Project"

http://www.dreadnoughtproject.org/sim/

Excellent work(!!!) on the Dumaresq and the Dreyer fire control table.
by marty1
Mon Nov 21, 2005 8:13 pm
Forum: Naval Technology
Topic: German 600-lbs KC N/a?
Replies: 0
Views: 1690

German 600-lbs KC N/a?

Post War Trials of German KC N/a Did the Germans produce a 600-lbs KC plate? If not what is the closest comparable plate thickness? I came across a document that summarizes post-WWII USN and RN trials of German KC N/a armor. Armour Technical Committee, 22-July 1948 (I’ll call it the ATC report as I...
by marty1
Thu Nov 03, 2005 4:44 pm
Forum: Books and Reference
Topic: DK Brown & "Nelson to Vanguard" -- Is it any g
Replies: 1
Views: 1589

DK Brown & "Nelson to Vanguard" -- Is it any g

So I am in the process of reading "Grand Fleet: Warship Design and Development 1906-1922" by D. K. Brown. The book is enjoyable for me. I was considering buying another of Brown's books: "Nelson to Vanguard: Warship Design 1923-1945 (Chatham Pictorial Series)". However I thought I would ask for opin...
by marty1
Wed Nov 02, 2005 10:30 pm
Forum: Bismarck General Discussion
Topic: Turret Armor
Replies: 35
Views: 13035

Dave: I have seen the same sort of conclusions that both pre-date and post date the US Army findings you refer to. One theory I have reviewed suggests that part of the reduction in limit velocity seen in spaced array tests is a result of fragmentation and high velocity spalling from the first plate ...