Search found 1260 matches

by marcelo_malara
Mon Oct 07, 2019 2:51 pm
Forum: Bismarck General Discussion
Topic: Bismarck´s paravanes
Replies: 13
Views: 1058

Re: Bismarck´s paravanes

Yes, I had read the 2006 discussion, but nothing was mentioned in deep on the attachment method.

Anyway, the chains were permanently in place?

Regards
by marcelo_malara
Mon Oct 07, 2019 12:23 am
Forum: Bismarck General Discussion
Topic: Bismarck´s paravanes
Replies: 13
Views: 1058

Re: Bismarck´s paravanes

Thanks Wadinga.
Most ships have two continuous loops of chain passing down from either side of the bow through a ring at the forefoot of the bow.
Don´t quiet understand this, these loops are permanently rigged? Do you have any photo?

Regards
by marcelo_malara
Sun Oct 06, 2019 6:12 pm
Forum: Bismarck General Discussion
Topic: Bismarck´s paravanes
Replies: 13
Views: 1058

Bismarck´s paravanes

Hi guys. I just saw this image of the paravane system used on Bismarck:

Image

Can someone explain how the system worked? The pole is somehow pull out of the stem? How is the towing cable attached?

Regards
by marcelo_malara
Sun Oct 06, 2019 5:54 pm
Forum: Ship Models, Plans and Drawings
Topic: Help finding a book
Replies: 3
Views: 1818

Re: Help finding a book

Seems to be a very interesting book! Will be tranlated to English?
by marcelo_malara
Wed Oct 02, 2019 8:16 pm
Forum: Naval History Post-1945
Topic: Falkland war
Replies: 15
Views: 11623

Re: Falkland war

The gravest negligence was sending that TF to the zone of war, or even initiating a war without the material needed. If the TF would have made 22 knots it would have made the attack more difficult, but not impossible, Conqueror war diary mentions that in case of difficulty with straight runners she ...
by marcelo_malara
Sat Sep 21, 2019 4:44 pm
Forum: Naval Propulsion
Topic: Weihe - Austrian torpedo boat 1888
Replies: 1
Views: 9175

Re: Weihe - Austrian torpedo boat 1888

The number is correct. I just found 400 rpm for RN destroyers of the day.

Regards
by marcelo_malara
Sat Sep 14, 2019 5:08 pm
Forum: Naval Propulsion
Topic: Lurrson effect rudders for Bismarck?
Replies: 2
Views: 447

Re: Lurrson effect rudders for Bismarck?

Hi, it seems an effect applicable to small vessels, the stern is lifted a little and this reduces resistance. Nowadays we have trim tabs for the same. Don´t think that a ship of the Bismarck size would benefit from it.

Regards
by marcelo_malara
Sat Sep 14, 2019 5:06 pm
Forum: Books and Reference
Topic: Axis ships damage reports
Replies: 0
Views: 619

Axis ships damage reports

Hi guys. I have a document titled Ships Damaged or Sunk by Enemy Action which contains brief descriptions of the damage received by the RN ships in WWII. In the Hyperwar web site I can find the same for the USN.

Is there anything like this for Italians and Japanese vessels?

Regards
by marcelo_malara
Sun Aug 25, 2019 2:15 am
Forum: Bismarck General Discussion
Topic: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940
Replies: 28
Views: 2141

Re: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940

Guys, I made some rough and very simplified calculations. Length...Beam..Diagonal...Water plane 250...…..36......126,29......4500 ……...t...…….Density....Volume dspl…..Draught...……..Wetted area....Resistance SW...40000...1,025....39024,39024.....8,672086721...8880,791328....9102,811 FW...40000...1,00...
by marcelo_malara
Sat Aug 24, 2019 11:01 pm
Forum: Bismarck General Discussion
Topic: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940
Replies: 28
Views: 2141

Re: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940

The difference in density from 1.025 to 1.008 traduces in 13 cm in the draught, don´t know it would make much difference in speed.

Regards
by marcelo_malara
Fri Aug 23, 2019 10:01 pm
Forum: Bismarck General Discussion
Topic: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940
Replies: 28
Views: 2141

Re: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940

There are some writings of D.K.Brown about this, shallow waters (meaning about 10-20 m) allows more speed, I think that 65 m is out of the effect.

Regards
by marcelo_malara
Fri Aug 23, 2019 3:23 am
Forum: Bismarck General Discussion
Topic: Battleship Bismarck: A Design and Operational History
Replies: 59
Views: 11565

Re: Battleship Bismarck: A Design and Operational History

What was the wind direction and speed that day?


Regards
by marcelo_malara
Thu Aug 22, 2019 12:12 am
Forum: Bismarck General Discussion
Topic: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940
Replies: 28
Views: 2141

Re: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940

Yes, with a little algebra you can reorder the original formula to mine. The system seems to have worked well, because the contemporary Jane´s gave 28 feet draught for Bismarck and 24 for Scharnhorst. My theory is that it would not have been difficult for the would-be Allies to assess the correct di...
by marcelo_malara
Tue Aug 20, 2019 3:35 pm
Forum: Bismarck General Discussion
Topic: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940
Replies: 28
Views: 2141

Re: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940

Let me try to understand this. There are 13 bars, I count how many are above water line, I take the next below water, in the photo would be number 9, so I start with 9 m, and add the decimeters to this. Right?
by marcelo_malara
Tue Aug 20, 2019 2:08 am
Forum: Naval Technology
Topic: Question For Bill Jurens & All Re Barrel Length
Replies: 8
Views: 1367

Re: Question For Bill Jurens & All Re Barrel Length

I think that you can see a PIAT in action in the movie "A bridge to far". Anyway, I don´t follow much tank developments, but I believe that the guns have the upper hand here, with velocities in excess 5500 fps an APFSDS dart would penetrate about 80 cm of armour, far beyond any practical thickness. ...