Search found 4231 matches

by dunmunro
Thu Jun 30, 2022 7:33 am
Forum: Bismarck General Discussion
Topic: Was the battleship Bismarck really the best of its time?
Replies: 161
Views: 10626

Re: Was the battleship Bismarck really the best of its time?

ut based on the the data from the Saacke burners (two per boiler) they are listed with fuel consumption of 3950 kgs /per hour per unit at "Äußerster Last", wich is about 3,750 m³ (density 0,95 t/m³)per hour per unit I made a mistake here the fuel Consumption at äußerste Last was for boile...
by dunmunro
Tue Jun 28, 2022 6:47 pm
Forum: Bismarck General Discussion
Topic: Was the battleship Bismarck really the best of its time?
Replies: 161
Views: 10626

Re: Was the battleship Bismarck really the best of its time?

understanding questions regarding fuel consumption of Tirpitz. the data point for 31,7 kn lists a consumption per hour from about ~68 m³ of fuel oil per hour. but based on the the data from the Saacke burners (two per boiler) they are listed with fuel consumption of 3950 kgs /per hour per unit at &...
by dunmunro
Thu Jun 23, 2022 5:15 pm
Forum: Bismarck General Discussion
Topic: Was the battleship Bismarck really the best of its time?
Replies: 161
Views: 10626

Re: Was the battleship Bismarck really the best of its time?

Hood made 28.8 knots with paravanes streamed (= ~29.5 knots 'clean') on post refit trials in March 1941.
by dunmunro
Wed Jun 22, 2022 3:13 am
Forum: Bismarck General Discussion
Topic: Was the battleship Bismarck really the best of its time?
Replies: 161
Views: 10626

Re: Was the battleship Bismarck really the best of its time?

Thank you dunmunro for pointing me to PoW's Gunnery Aspects Report (GAR). The report says: "3. The rangefinders failed to develop a satisfactory range plot before opening fire; the fore D.C.T. 15-ft rangefinder was the only rangefinder which had a reasonable chance; the closing rate was very h...
by dunmunro
Tue Jun 21, 2022 7:52 pm
Forum: Bismarck General Discussion
Topic: Was the battleship Bismarck really the best of its time?
Replies: 161
Views: 10626

Re: Was the battleship Bismarck really the best of its time?

PoW's DCT optics did not suffer spray issues during her engagements with Bismarck nor any loss of 14in output due to water ingress. She did suffer a loss of Radar however. Bismarck had Anton turret RFs removed due to spray issues, IIRC. Concerning the spray and water in the turret I am referring to...
by dunmunro
Tue Jun 21, 2022 3:10 pm
Forum: Bismarck General Discussion
Topic: Was the battleship Bismarck really the best of its time?
Replies: 161
Views: 10626

Re: Was the battleship Bismarck really the best of its time?

3. Seaworthiness: Some claimed the great metacentric height of Bismarck made her unstable, but we should not forgt the stabilizing effect of the heavy armor at the far outsides of her very wide beam which made her a very stable gun platform. During hard over rudder turns she heeled only 3 degrees. ...
by dunmunro
Sun Jun 19, 2022 8:51 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 654

Re: British submarines' torpedo hits compared to German u-boats'

The USN's Arma Mk3 TDC was an excellent WW2 torpedo fire control system. Many argue that a valid argument can be made that it was the finest such device of the war. The Mark XIV torpedo, not so much. Multiple design flaws plagued it until 1943 - bad depth sensor design, badly designed contact fuze,...
by dunmunro
Sun Jun 19, 2022 8:13 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 654

Re: British submarines' torpedo hits compared to German u-boats'

That doesn't make sense. What does make sense is that target angle = 80deg actually states that the target is moving rapidly away from the Uboat. Forget the U202 KTB and the Rio Tercero sinking. Generically speaking, could you draw the geometry of an 80° angle on the bow and explain how in this sit...
by dunmunro
Sun Jun 19, 2022 6:51 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 654

Re: British submarines' torpedo hits compared to German u-boats'

UNITED STATES SUBMARINE OPERATIONS IN WORLD WAR II, Theodore Roscoe, page 54 "Throughout the war the percentage of hits was more or less constant for track angles between 60deg and 120deg and ranges between 1,000 and 3,000 yards. Within the region the scored hits averaged 36%. The percentage o...
by dunmunro
Sun Jun 19, 2022 6:47 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 654

Re: British submarines' torpedo hits compared to German u-boats'

That doesn't make sense. What does make sense is that target angle = 80deg actually states that the target is moving rapidly away from the Uboat. Could you draw the geometry of this and explain how an angle on the bow/inclination/target aspect angle of 80° means a retiring vehicle? Regards Again, t...
by dunmunro
Sun Jun 19, 2022 2:10 am
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 654

Re: British submarines' torpedo hits compared to German u-boats'

This is the KTB entry: Three fan from tube I, II, IV fire! Shooting data: Bow right, target angle 80°, speed 11 knots, range = 2000 meters , spread angle 2, depth 3 meters, aim point center. Hit after 4 minutes 43 seconds = 4350 meters. Hit center. High detonation cloud, afterwards white smoke from...
by dunmunro
Sat Jun 18, 2022 8:15 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 654

Re: British submarines' torpedo hits compared to German u-boats'

Nooo, do you think that an 11 knot ship would sail 2300 m in 4 minutes? Moreover, look at the geometry of the attack, there is no way range could have changed so much during runtime. This is the KTB entry: Three fan from tube I, II, IV fire! Shooting data: Bow right, target angle 80°, speed 11 knot...
by dunmunro
Sat Jun 18, 2022 8:10 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 654

Re: British submarines' torpedo hits compared to German u-boats'

A crude estimate: Germany fired: 7000 G7e 2300 G7a 640 T5 Total 9940 (Naval weapons of WWII) Ship sunk with them: 2673 (https://uboat.net/special/analysis.htm) Effectivity 27% UK fired: 5121 (presumably all Mk VIII) (Naval weapons of WWII) Ship sunk with them: ? These numbers have to be taken with ...
by dunmunro
Sat Jun 18, 2022 7:52 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 654

Re: British submarines' torpedo hits compared to German u-boats'

In the case of the Rio Tercero (nothing special with this case except that it was a neutral vessel) the shot was at 4300 m and was steaming at 11 knots, it may rank high between the longest ranged torpedo hits in the war. The running time was 4 min 43 sec. The range at the moment of firing was ~200...
by dunmunro
Sat Jun 18, 2022 6:42 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 654

Re: British submarines' torpedo hits compared to German u-boats'

Director angle, yes, I should have known, as the RN computer was so called. In the case of the Rio Tercero (nothing special with this case except that it was a neutral vessel) the shot was at 4300 m and was steaming at 11 knots, it may rank high between the longest ranged torpedo hits in the war. T...