Search found 219 matches

by marty1
Mon Oct 03, 2005 7:59 pm
Forum: Bismarck General Discussion
Topic: Norfolk and suffolk in the Denmark strait!
Replies: 47
Views: 16909

Have you already looked through:

ADM 53/114810: NORFOLK, 1941 MAY

ADM 53/115099: SUFFOLK, 1941 MAY

?
by marty1
Thu Sep 15, 2005 8:56 pm
Forum: Bismarck General Discussion
Topic: Turret Armor
Replies: 35
Views: 13035

Re: George Elder

Paul L: Sounds good to me! I have toyed with a simplistic formula involving spaced armor effects. It seems to work well with smaller projectiles & APFSDS. The net additional resistance of a given spaced plate is t/d [spaced plate] ^0.5 * Penetrator velocity at impact. Plate hardness would increase ...
by marty1
Fri Sep 09, 2005 5:54 pm
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

Antonio: I was looking at your battle plot for Denmark Straits. http://www.kbismarck.org/photos/antonio_bonomi_map.jpg I assume the first photo we examined represents points 56 (5.56) for both the Bismarck & Prinz Eugen course plots. By the way I ran thru my range estimation calcs for the first phot...
by marty1
Fri Sep 09, 2005 6:24 am
Forum: Naval Technology
Topic: SAP & Common Shell Armor Penetration Estimation?
Replies: 0
Views: 1281

SAP & Common Shell Armor Penetration Estimation?

Has anyone ever come across a relationship for estimating armor penetration of SAP or common shell -- something akin to the DeMarre Equation for AP?

Thanks for any replies.

Regards
marty
by marty1
Thu Sep 01, 2005 5:55 pm
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

Hi Antonio: Ok – I think I am on the same page now. I can see there are a number of great advantages to this method. Simplicity and speed being chief amongst these advantages. My approach is much more complex and time consuming, and relies upon photo depth scaling of objects within the photo. Howeve...
by marty1
Wed Aug 31, 2005 8:39 pm
Forum: Naval Weapons
Topic: Questions about RDX and Torpex
Replies: 8
Views: 5785

Hi Tommy: Yes, I have also seen references to the medicinal use of Cyclonite. Perhaps it was something like taking nitroglycerin for a heart condition. Better health through the practical application of explosives. Do you have any thoughts on Soviet use of Amatol during this period? Did they have go...
by marty1
Wed Aug 31, 2005 8:24 pm
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

Focal Length & Scale Factor

Antonio: I think I understand your approach to the range estimation problem – “maybe”. The scale factor is simply the height of the Bismarck image on the 24mmx36mm negative divided by the actual height of the Bismarck. The range to Bismarck is than simply the focal length of the camera divided by th...
by marty1
Wed Aug 31, 2005 6:17 am
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

Lagemann's focal length???

Hi Ulrich Yes I recall from days of reading Hornblower, C.S. Forester's descritpion of down the Captian cabins walls and such whenever a ship cleared for action. It just seemed odd to haul down safety rails, but as you and Mac-One suggest, I'm sure there was a very good reason for this activity. Ant...
by marty1
Mon Aug 29, 2005 8:24 pm
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

At the risk of diverging further from the intent of the thread -- but why were the foldable handrails taken down when a ship clears for action?
by marty1
Mon Aug 29, 2005 7:18 pm
Forum: Naval Weapons
Topic: Questions about RDX and Torpex
Replies: 8
Views: 5785

Thanks Tommy. This is perhaps very obscure -- but I have been looking over Soviet/Red Naval AP projectiles from the mid-1930's up to the end of WWII. I have been unable to find anything reliable from this period regarding bursting charges and their composition. Much of the information I have stems f...
by marty1
Mon Aug 29, 2005 4:33 am
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

Whats up with the disapearing handrails?

I finally sat down and crunched through my numbers for the refueling photo. I get an angular height of Bismarck to be about 130-mils. I think Bismarck’s is ridding a bit higher out of the water than has been assumed previously. The waterline at the bow is fairly clear. I therefore obtained a vertica...
by marty1
Wed Aug 24, 2005 3:18 am
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

Hi IanKw: I think you’re right. It may be easier to measure from the deck edge to the top of the mast rather than guessing at the waterline and than measuring to the top of mast. Using my best guess at where the deck is, and using it as my lower Bismarck edge, and using the same location on the mast...
by marty1
Sun Aug 21, 2005 9:06 pm
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

My Guesstimate

Hi Antonio: Sorry – I didn’t have a chance to look over Bills comments aside from the issue associated with interpreting the edge contours of Bismarck. As we have already discussed earlier in this thread, this is indeed an issue. I developed an angular scale based upon the linear distance from Lagem...
by marty1
Sat Aug 20, 2005 7:48 pm
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

The second thing that popped into my head after looking at the higher quality shell casing image you sent to me was the aspect of the Bismarck. I had not noticed this before, but it looks like the Bismarck's bow is down -- plungging through a swell. I assume this would effect the presumed height of ...
by marty1
Sat Aug 20, 2005 7:41 pm
Forum: Bismarck General Discussion
Topic: Photo # NH 69722 distance evaluation
Replies: 80
Views: 34889

Thanks very much Antonio. I received the images -- all excellent. The much higer quality shell casing picture you sent, as well as the Philidephia images you forwarded along raise a couple of additional questions in my mind. The first question regards the location of the bollards. I think I am suffe...