Search found 1275 matches

by marcelo_malara
Fri Apr 17, 2020 11:43 pm
Forum: Naval History (1922-1945)
Topic: Monitors
Replies: 29
Views: 1838

Re: Monitors

The height of the turrets, as far as I know, was dictated by the shallow draft, the mountings were about the same as fitted to the 15" battleships, a shallower hull meant that some of the mounting would protude above upper deck.

Regards
by marcelo_malara
Fri Apr 17, 2020 11:39 pm
Forum: Naval History (1922-1945)
Topic: Monitors
Replies: 29
Views: 1838

Re: Monitors

In the 15" monitors the barbettes were 8" thick, not as thick as in a battleship, but as they were not intended to fight an enemy battleship that seems quiet good. A monitor chooses from where to fire, surely she would not close to a shore defended by a 15" coastal gun.
by marcelo_malara
Fri Apr 10, 2020 7:52 pm
Forum: Bismarck General Discussion
Topic: Wind Behavior: 0400 - 0600
Replies: 35
Views: 1621

Re: Wind Behavior: 0400 - 0600

Thanks Bill.
by marcelo_malara
Fri Apr 10, 2020 7:50 pm
Forum: Books and Reference
Topic: Anatomy of the Ship Iowa/Stefan Draminski
Replies: 15
Views: 1967

Re: Anatomy of the Ship Iowa/Stefan Draminski

May be the culprit is not the author, but the publishing house. Osprey will never be Conway, may be it had been better for Conway to have been taken over by Penn & Sword/Seaforth.

Regards
by marcelo_malara
Wed Apr 08, 2020 5:00 pm
Forum: Books and Reference
Topic: Anatomy of the Ship Iowa/Stefan Draminski
Replies: 15
Views: 1967

Re: Anatomy of the Ship Iowa/Stefan Draminski

There are many original scanned plans in the site www.hnsa.org, I think Iowa´s can be found there.

Regards
by marcelo_malara
Wed Apr 08, 2020 4:56 pm
Forum: Bismarck General Discussion
Topic: Wind Behavior: 0400 - 0600
Replies: 35
Views: 1621

Re: Wind Behavior: 0400 - 0600

Paul, that´s why the hit rate is so low, about 2% in the battle of Jutland for example. You can find many ballistic data in the navweaps site. Bill, thanks four your posting. " for a fairly typical big gun at a range of about 20000 yards, range might be expected to change about 7 yards per knot of h...
by marcelo_malara
Wed Apr 08, 2020 1:29 am
Forum: Bismarck General Discussion
Topic: Wind Behavior: 0400 - 0600
Replies: 35
Views: 1621

Re: Wind Behavior: 0400 - 0600

Don´t quiet understand. Is there any estimation of how much can vary the point of impact using/disregarding wind data?

Regards
by marcelo_malara
Tue Apr 07, 2020 4:47 pm
Forum: Bismarck General Discussion
Topic: Wind Behavior: 0400 - 0600
Replies: 35
Views: 1621

Re: Wind Behavior: 0400 - 0600

Well, I had opened a new threat about this, but we can deal with it here. So Bill, if the wind have no great effect, why it was used in the firing computers? Why not disregard it completely?
by marcelo_malara
Tue Apr 07, 2020 12:37 am
Forum: Naval Weapons
Topic: Wind correction in long range gunnery
Replies: 3
Views: 482

Re: Wind correction in long range gunnery

I think that the variation responds to the dynamic pressure formula: Q = 0.5 * rho * V^2 * S * C rho = air density V = velocity S = surface exposed to the flow C = a non dimensional coefficient related to the form Air density decreases with altitude, approximately linearly for the lower atmosphere, ...
by marcelo_malara
Sun Apr 05, 2020 5:47 pm
Forum: Bismarck General Discussion
Topic: Wind Behavior: 0400 - 0600
Replies: 35
Views: 1621

Re: Wind Behavior: 0400 - 0600

We cannot disregard "the human factor", may be at 6 am, just in the middle of the battle, the crew was a little busy and worried to assess correctly the wind direction. Anyway, there are some explanations that I can put forward: -changes in wind speed: they just happen at any moment, are very common...
by marcelo_malara
Sat Apr 04, 2020 11:08 pm
Forum: Naval Weapons
Topic: Wind correction in long range gunnery
Replies: 3
Views: 482

Wind correction in long range gunnery

Hi guys, a question related to wind. What was the effectiveness of putting the wind in the long range gunnery calculation? The firer can only measure the wind direction and speed at sea level, on firing the shell will climb many thousand meters, passing by atmospheric layers with different wind dire...
by marcelo_malara
Sat Apr 04, 2020 10:46 pm
Forum: Bismarck General Discussion
Topic: Wind Behavior: 0400 - 0600
Replies: 35
Views: 1621

Re: Wind Behavior: 0400 - 0600

Hi Bill. The sources are: https://www.netweather.tv/charts-and-data/gfs-archive https://www.metcheck.com/WEATHER/gfs_reanalysis_1871_now.asp# Don´t specify time of the charts. There is a third site: https://www.wetterzentrale.de/reanalysis.php?map=1&model=noaa&var=1&jaar=1941&maand=05&dag=21&uur=000...
by marcelo_malara
Sat Apr 04, 2020 5:42 pm
Forum: Bismarck General Discussion
Topic: Wind Behavior: 0400 - 0600
Replies: 35
Views: 1621

Re: Wind Behavior: 0400 - 0600

Added to the excel the corretion for gradient wind around a low. The gradient wind is the one that besides pressure gradient force and Coriolis effect, takes into account the centrifugal force provoked by the wind following a curved isobar. Using the same presure gradient as before, and measuring th...
by marcelo_malara
Sat Apr 04, 2020 4:26 pm
Forum: Warship Photos
Topic: Can anyone identify these cannon?
Replies: 2
Views: 4850

Re: Can anyone identify these cannon?

A little late, I would like to see the photos.

Regards
by marcelo_malara
Sat Apr 04, 2020 4:11 pm
Forum: Books and Reference
Topic: A strange occurance
Replies: 2
Views: 359

Re: A strange occurance

Like you said Paul, the pilot decided not to shot down an already heavily damaged and defenseless B-17, allowing it to return to UK. I think that we spoke about it in this forum years ago. Personally, I don´t think any lives were spared, because surely the crew flew again another bomber mission to k...