Search found 233 matches

by ontheslipway
Tue Sep 06, 2022 10:29 am
Forum: Naval History Post-1945
Topic: German warships found
Replies: 3
Views: 1629

Re: German warships found

A number of ships were found in the Donau (Danube)

https://www.newsweek.com/drought-europe ... er-1735263
by ontheslipway
Thu Aug 04, 2022 9:40 am
Forum: Bismarck General Discussion
Topic: bismark-after torpedo hit
Replies: 208
Views: 35800

Re: bismark-after torpedo hit

It has been so long I thought about Bismarck that I honestly could not remember if the shaft lines were converging or diverging (while running aft; the latter but barely). I found a few old(ish) papers in our archives trying to explain why HMS Nelson ran aground in 1934*. One article I found mention...
by ontheslipway
Wed Mar 10, 2010 5:39 pm
Forum: Ship Models, Plans and Drawings
Topic: 1/350 HMS Hood, scratchbuild
Replies: 12
Views: 11689

Re: 1/350 HMS Hood, scratchbuild

Two paravanes were mounted just aft of the conning tower, stowed to a bulkhead. Two others were stored in the lockers in the forward breakwater. There are many pictures of paravanes at The Vickers Photographic Archive . The size was determined from several Anatomy of the Ship series and estimates fr...
by ontheslipway
Thu Feb 11, 2010 4:27 pm
Forum: Ship Models, Plans and Drawings
Topic: 1/350 HMS Hood, scratchbuild
Replies: 12
Views: 11689

Re: 1/350 HMS Hood, scratchbuild

Main model kit? What main model kit? And I have 5 casts and no problems with my model. ;)
by ontheslipway
Thu Feb 11, 2010 4:07 pm
Forum: Bismarck General Discussion
Topic: Bismarck Speed
Replies: 624
Views: 73600

Re: Bismarck Speed

At least it's less confusing than for most navies, who give their speed in rpm. This rpm has nothing to do with the actual rpm, but it translates as a speed to them. Or so I've heard ;)
by ontheslipway
Thu Feb 11, 2010 11:34 am
Forum: Bismarck General Discussion
Topic: Bismarck Paint storage
Replies: 23
Views: 9119

Re: Bismarck Paint storage

More paint that fuel?
by ontheslipway
Thu Feb 11, 2010 10:51 am
Forum: Bismarck General Discussion
Topic: Bismarck Speed
Replies: 624
Views: 73600

Re: Bismarck Speed

The more I look at it the more likely I think the high numbers I read are due to someone translating the speed in knots to mph and subsequent sloppiness on the part of someone. This is well possible. A nautical mile is around one arc minute of the world's supposed circumference of 40,000 kilometers...
by ontheslipway
Thu Feb 11, 2010 10:05 am
Forum: Ship Models, Plans and Drawings
Topic: 1/350 HMS Hood, scratchbuild
Replies: 12
Views: 11689

Re: 1/350 HMS Hood, scratchbuild

I have updated My blog The etch set presented in Custom Photoetch Set Part II is now done. There was a slight delay as set received some minor adjustments as required by the etches and I felt I could add one more part. The set was etched by Saemann Ätztechnik in Germany, with excellent results. Here...
by ontheslipway
Tue Feb 09, 2010 5:04 pm
Forum: Bismarck General Discussion
Topic: Bismarck Speed
Replies: 624
Views: 73600

Re: Bismarck Speed

The hull speed is caused by either wave interaction of the hull wave components. If the wave is very slender, you have a small wave from the bow and stern, and you reach the hump speed when the wave from the bow reaches the length of the ship (Froude = 0.5). For some ships, waves from the forward an...
by ontheslipway
Tue Feb 09, 2010 4:23 pm
Forum: Bismarck General Discussion
Topic: Bismarck Speed
Replies: 624
Views: 73600

Re: Bismarck Speed

Very slender (multihull) ships don't have a lot of wave making resistance so that makes it easy to pass the hump speed. So, cruisers with an 1:10 beam-to-length ratio have less difficulty going to higher speeds than tankers. Fast catamarans are always very slender (double) hulls. Once over their hum...
by ontheslipway
Tue Feb 09, 2010 3:26 pm
Forum: Bismarck General Discussion
Topic: Bismarck Speed
Replies: 624
Views: 73600

Re: Bismarck Speed

That is correct, though not fully planing. When you go from Froude above 0.5, you are entering regions where dynamic lift is becoming important, going to semi-planing. From Froude 0.5 to 0.6., the resistance curve can even drop a little bit. You get full planing near Froude = 1. Using wiki data (yes...
by ontheslipway
Tue Feb 09, 2010 2:56 pm
Forum: Bismarck General Discussion
Topic: Bismarck Speed
Replies: 624
Views: 73600

Re: Bismarck Speed

Most destroyers can go to much higher speed regimes than large surface warships. That is, if they have the proper hull shape. WWII cruisers and battleships do not have this hull shape and usually stick around Froude numbers (ship speed / sqrt(g*L_waterline) ) of around 0.3-0.33. Destroyers can go to...
by ontheslipway
Tue Feb 09, 2010 2:12 pm
Forum: Bismarck General Discussion
Topic: Bismarck Speed
Replies: 624
Views: 73600

Re: Bismarck Speed

To claim that PE could do 40 knots makes this information quite anecdotal and unreliable. It's simply not realistic to make such a claim while mentioning that the records were deliberately misleading. At 40 knots, she'll generate waves longer than the ship itself which is prohibitively power-consumi...
by ontheslipway
Fri Feb 05, 2010 6:53 pm
Forum: Bismarck General Discussion
Topic: Bismarck Paint storage
Replies: 23
Views: 9119

Re: Bismarck Paint storage

IIRC, the paint store for Bismarck is just above the propeller shaft lines, deep within the hull.
by ontheslipway
Tue Feb 02, 2010 6:37 pm
Forum: Bismarck General Discussion
Topic: Bismarck Speed
Replies: 624
Views: 73600

Re: Speed - Bismarck versus Scharnhorst/Gneisenau

That is quite typical of any shipyard - shipowner relationship. The yard is subjected to contractual fines if the specs are not met within a certain margin. The owner can even reject the ship and leave the yard with a new yacht. This does happen, although I guess the owner will have a good standing ...