Search found 1457 matches

by marcelo_malara
Sat Jul 23, 2022 3:12 am
Forum: The Ironclad & Pre-dreadnought Era (1860-1905)
Topic: The REAL first 'all big gun' battleship
Replies: 23
Views: 20669

Re: The REAL first 'all big gun' battleship

Was just reading 'The Design and Construction of the Battleship Dreadnought' by DK Brown in Warship Vol 4, and at the end, he mentions that after the trias of the 1881 battleship Inflexible, there was a proposal to build a 4 twin 16 inch gunned turret version of the Inflexible--sort of a combinatio...
by marcelo_malara
Wed Jun 22, 2022 2:44 pm
Forum: World War II
Topic: the Tallboy bomb
Replies: 1
Views: 587

Re: the Tallboy bomb

The sonic boom. Yes, every object moving at the speed of sound produces it. But you have to be behind the passing object to feel it. Sailors on board for sure did not.
by marcelo_malara
Sun Jun 19, 2022 8:43 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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

If target angle = 0 means the target is on a parallel course to the sub, than target angle = 80, means the target is moving almost directly away from the sub. If Target angle = 90 means that the target is on a parallel course with the sub, then target angle 80 means that the range is opening slowly...
by marcelo_malara
Sun Jun 19, 2022 7:14 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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 marcelo_malara
Sun Jun 19, 2022 7:10 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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 marcelo_malara
Sun Jun 19, 2022 5:53 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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
by marcelo_malara
Sun Jun 19, 2022 1:54 am
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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

Hi Marcelo, -target bearing -target speed -angle on the bow, inclination or target aspect angle, anyway you call it One can be measured the others are mere estimates. The estimates generate the future position to which the torpedo must travel. If the torpedo arrives too early or too late it's a mis...
by marcelo_malara
Sun Jun 19, 2022 1:50 am
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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 marcelo_malara
Sat Jun 18, 2022 8:03 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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

FC computer only needs:

-target bearing
-target speed
-angle on the bow, inclination or target aspect angle, anyway you call it

Optionally:

-for large gyro angle target range
-target length for dispersion
by marcelo_malara
Sat Jun 18, 2022 8:00 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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.
by marcelo_malara
Sat Jun 18, 2022 7:44 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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

Hi All, On these figures, Rio Tercero subtends only 0.22 of a degree at 4300m ( if beam on to the U-boat) so spreading by 2 whole degrees between shots as shown indicates how much luck was involved in this circumstance. I am sure I have read an account saying U-boat commanders frequently overrode a...
by marcelo_malara
Sat Jun 18, 2022 7:04 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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 marcelo_malara
Sat Jun 18, 2022 6:51 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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:

?
by marcelo_malara
Sat Jun 18, 2022 6:09 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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. Th...
by marcelo_malara
Sat Jun 18, 2022 3:21 pm
Forum: Naval History (1922-1945)
Topic: British submarines' torpedo hits compared to German u-boats'
Replies: 49
Views: 1153

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

Thanks! At first sight some numbers don´t look good, a salvo of 4 torpedoes at 1000 yards on a 6 kt target and hitting with only one is, I must say,...poor. It seems that the technique was firing the torpedoes as the selected parts of the ship were coming into the periscope pip, so the long delays b...