Search found 1360 matches

by marcelo_malara
Tue Sep 21, 2021 3:54 pm
Forum: Naval Technology
Topic: Von der Tann plans
Replies: 3
Views: 50

Re: Von der Tann plans

Thanks, I see, and there are more of that, on the panzer deck fore and aft, battery deck fore and may be aft too.
by marcelo_malara
Tue Sep 21, 2021 2:46 pm
Forum: Naval Technology
Topic: Von der Tann plans
Replies: 3
Views: 50

Re: Von der Tann plans

by marcelo_malara
Tue Sep 21, 2021 2:45 pm
Forum: Naval Technology
Topic: Von der Tann plans
Replies: 3
Views: 50

Von der Tann plans

Hi guys. I got this plans from a local forum. Two questions.

-anyone can say where they are from?

-those German speaking, can tell where the crew spaces are?





Image

Image
by marcelo_malara
Mon Sep 20, 2021 9:56 pm
Forum: Naval Technology
Topic: Radio direction finder, Samos
Replies: 6
Views: 160

Re: Radio direction finder, Samos

Yes, the powers of 10 should be decibels, a measure of signal power. The peilen scale should be related to bearing, but I can not imagine what the numbers are. A scale in any instrument should tell the physical magnitude it measures, in the case of the decibels they are not a magnitude in itself, be...
by marcelo_malara
Fri Sep 10, 2021 11:12 pm
Forum: Bismarck General Discussion
Topic: 150/152 mm gun turret locations
Replies: 11
Views: 352

Re: 150/152 mm gun turret locations

You mean putting one secondary turret in the center line. That is easier to do in Richelieu, it was done in the stern with no primary turrets around. To do this in Bismarck would mean that the 6" turret needs to super fire Bruno or Cesar, and that would put some weight high in the ship. Yes, it...
by marcelo_malara
Tue Sep 07, 2021 7:17 pm
Forum: Bismarck General Discussion
Topic: Bismarck range
Replies: 28
Views: 563

Re: Bismarck range

325 grams/hp/hour was just a contractually guaranteed maximum fuel consumption for 265 rpm at 3x46,000 SHP. In case of rpm and SHP didn't correlate in reality the guaranteed maximum fuel consuption had to be recalculate with the help of a special table. Hi! Do you have actual consumption numbers fo...
by marcelo_malara
Mon Sep 06, 2021 2:31 pm
Forum: Naval Propulsion
Topic: Charcoal Fueled Steamship in a Fantasy World
Replies: 14
Views: 339

Re: Charcoal Fueled Steamship in a Fantasy World

Mmmmm....electricity means copper, copper has to be cast too. There is also the problem of the heavy machinery for the construction of the dams, how would they be powered? By the way, there is a book, I have it in my wish list, Forests and Sea Power, describes the logistics and problems behind the s...
by marcelo_malara
Mon Sep 06, 2021 12:53 am
Forum: Naval Propulsion
Topic: Charcoal Fueled Steamship in a Fantasy World
Replies: 14
Views: 339

Re: Charcoal Fueled Steamship in a Fantasy World

So we end in the Medieval Age with some modern knowledge. Could we built steam engines and boilers with cast and wrought iron melted with charcoal? Would be available enough charcoal to produce iron for hulls? Or do we stay with steam propelled wooden ships?
by marcelo_malara
Mon Sep 06, 2021 12:47 am
Forum: Naval Propulsion
Topic: Charcoal Fueled Steamship in a Fantasy World
Replies: 14
Views: 339

Re: Charcoal Fueled Steamship in a Fantasy World

Your commentary made me think deeply. I doubt that your world is feasible. Basically you are speaking of Medieval Age with some improvements. If the only energy source is charcoal from forests, and that same forests are used for shipbuilding, they would be quickly depleted. Cast iron would need char...
by marcelo_malara
Sun Sep 05, 2021 10:57 pm
Forum: Naval Propulsion
Topic: Charcoal Fueled Steamship in a Fantasy World
Replies: 14
Views: 339

Re: Charcoal Fueled Steamship in a Fantasy World

Well, yes, turbine´s efficiencies has improved over the years, going from the direct acting ones, to single geared and double geared, you need this data to know about which one we are speaking about. Meanwhile triple expansion had ceased to be developed, there was even quadruple expansion, but at th...
by marcelo_malara
Sun Sep 05, 2021 8:52 pm
Forum: Naval Propulsion
Topic: Charcoal Fueled Steamship in a Fantasy World
Replies: 14
Views: 339

Re: Charcoal Fueled Steamship in a Fantasy World

I am not sure of the efficiencies posted, I don´t believe that the turbine is 3 times more efficient than triple expansion, remember that battleships were still being built with triple expansion engines when the turbine already existed (most notable by US and Germany). That numbers would make a turb...
by marcelo_malara
Sun Sep 05, 2021 5:49 pm
Forum: Naval Propulsion
Topic: Fletcher-class acceleration
Replies: 7
Views: 389

Re: Fletcher-class acceleration

You can have full pressure, but that would fall quickly if you full open the throttles without enough steam volume to replace the used one. I think that a slow sailing ship has some boilers out of line, and going to full speed requires lighting them (or at less allowing more fuel to the burners if t...
by marcelo_malara
Sun Sep 05, 2021 4:12 pm
Forum: Naval Propulsion
Topic: Fletcher-class acceleration
Replies: 7
Views: 389

Re: Fletcher-class acceleration

Hi Byron. You are thinking about the problem in Newton´s Second Law terms: F = m * a More specifically in this form: F/m = a But, that would be right if the excess of F (the propeller thrust) is instantly available, which is not so in a steam ship. So I would say that the ability to raise more steam...
by marcelo_malara
Sun Sep 05, 2021 1:32 am
Forum: Bismarck General Discussion
Topic: Bismarck range
Replies: 28
Views: 563

Re: Bismarck range

I want to share this numbers from Hood to illustrate the value of length (260 m, beam 30 m), from Northcott´s Hood. 41600 t 20.37 kt 29080 hp 41850 t 25.24 kt 58020 hp 42100 t 27.77 kt 89010 hp 42150 t 29.71 kt 116150 hp 42200 t 32.07 kt 151280 hp Compare this with: Warpite (lenght 196 m) 24 kt 7500...
by marcelo_malara
Sun Sep 05, 2021 1:21 am
Forum: Naval Propulsion
Topic: Fletcher-class acceleration
Replies: 7
Views: 389

Re: Fletcher-class acceleration

Hi guys. I would say that Fletcher´s longer hull and more extreme machinery would better the RN numbers.