Search found 4018 matches

by dunmunro
Wed May 12, 2021 8:33 pm
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

There was nothing ground breaking about Mk37, as the Mk33 had all the same features ..... OD3147 – DEFENSE AGAINST DIVE BOMBERS USING GUN DIRECTORS Mk. XIX, Mk. XXVIII, Mk. XXXIII and MK. XXXVII 14 September 1939 OBJECT 1. The object of this pamphlet is to p[resent the various methods of defense ag...
by dunmunro
Wed May 12, 2021 7:53 pm
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

It not possible to add ~4 tons at the director level (~55ft AWL) and not have it cause serious issues for ship stability. As the BuOrd history makes clear, one of the design goals of Mk37 was to reduce topweight, and this goal was not met. Hi dunmunro, Apparently, Bureau of Ships did not share your...
by dunmunro
Wed May 12, 2021 9:07 am
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

The Fletcher class was the largest class of destroyers built during WWII. Subsequent classes also used the Mark 37. If it was too heavy for previous classes I think that's actually kind of irrelevant. Hi Steve, The Farragut Class (followed by the pre-war Mahans, Gridleys, Dunlaps, Bagleys, Benhams ...
by dunmunro
Tue May 11, 2021 4:16 am
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

There was nothing ground breaking about Mk37, as the Mk33 had all the same features ..... OD3147 – DEFENSE AGAINST DIVE BOMBERS USING GUN DIRECTORS Mk. XIX, Mk. XXVIII, Mk. XXXIII and MK. XXXVII 14 September 1939 OBJECT 1. The object of this pamphlet is to p[resent the various methods of defense ag...
by dunmunro
Tue May 11, 2021 4:11 am
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

Please advise where this figure of 127 AA kills has come from in connection with the Battle of Santa Cruz. I am at a bit of a loss to understand why you made this statement: In the first eight months of the war (Dec 1942 through Jul 1942) 1,033 IJNAF aircraft were listed as combat losses, of which ...
by dunmunro
Mon May 10, 2021 5:53 pm
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

The Fletcher class was the largest class of destroyers built during WWII. Subsequent classes also used the Mark 37. If it was too heavy for previous classes I think that's actually kind of irrelevant. The weight of Mk37 was very relevant to the classes prior to the Fletcher class, considering that ...
by dunmunro
Mon May 10, 2021 3:35 am
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

Why is it that none of the drawbacks of USN AA FC are never mentioned? I was under the impression that is what you have been doing. In fact, your latest claim is that Mk 37 was worse than Mk 33. Why is it that none of the drawbacks of RN AA FC are never mentioned? What armament was removed from the...
by dunmunro
Mon May 10, 2021 2:39 am
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

There was nothing ground breaking about Mk37, as the Mk33 had all the same features and Mk37 was not fitted with 'autotracking radar'. The MK4 FD radar was manually tracked. I'm sorry to say, dunmunro, that you have some things rather wrong here. Design of the Mk37 was undertaken only two years aft...
by dunmunro
Mon May 10, 2021 2:13 am
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

Didn't british cruisers with the 5"/38 and Mark 37 combo like it a lot? Did they get infected with US enthusiasm for the system? Yes indeed, Iville Porteous (father of "Flyplane") and Hugh Clausen (then Chief Technical Advisor to DNO) went aboard HMS Delhi to inspect its 5in/38 Mk37GFCS in February...
by dunmunro
Mon May 10, 2021 2:08 am
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

The USN claimed 127 AA kills at Santa Cruz, this is in addition to USN CAP, Escort and strike aircraft claims, and the AA numbers. alone, are far in excess of the total number of IJN strike sorties at Santa Cruz, not all of which were shot down. Similar USN overclaims were made in almost all naval ...
by dunmunro
Sun May 09, 2021 8:03 pm
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

1) Right, so since we don't have comparable info for the RN guns, you assume they were superior. A few of things are apparent to me: If you have an aircraft approaching the TF and every gun in the force is encouraged to fire on it at maximum rate, you are going to expend a lot of ammo to kill one a...
by dunmunro
Sun May 09, 2021 6:33 pm
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

So what perceived advantages does the 4.5" gun have over the 5"/38? What is it about British AA kill claims that makes them more accurate? The British have better eyesight? It isn't likely genetic, since there is a common origin. Didn't british cruisers with the 5"/38 and Mark 37 combo like it a lo...
by dunmunro
Sun May 09, 2021 6:46 am
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

An important and less well understood technical advance for the heavy AA in 1942 was introduction of the fully stabilized Mk37 + new Computer Mk 1 GFCS + auto-tracking radar + RPC for the 5in/38 mounts. The ground-breaking Mk37 GFCS (gunfire control system) was only just being introduced into the f...
by dunmunro
Sun May 09, 2021 6:40 am
Forum: Naval Weapons
Topic: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12
Replies: 32
Views: 442

Re: British 4.5"/45 (11.4 cm) vs American 5"/38 (12.7 cm) Mark 12

The USN based their AA studies on USN AA kill claims. These claims were inevitably inflated (probably by a factor of 2 to 3) due to multiple claims per aircraft shot down, as aircraft were almost invariably being engaged by multiple ships. The statement for the 5in/38 being effective as an AA weapo...