Search found 20 matches

by Siegfried
Fri Dec 30, 2016 5:54 am
Forum: Naval Weapons
Topic: Plunging fire
Replies: 18
Views: 15096

Re: Plunging fire

By "belt" I presume you are both talking about the 320mm portion of Bismarck's main belt: http://www.kbismarck.com/proteccion6.gif The majority of the belt was located above the waterline (3.0/1.8 meters as designed, but 2.6/2.2 meters in practice), with the reasoning that shells are more likely to...
by Siegfried
Fri Dec 30, 2016 5:32 am
Forum: Naval Weapons
Topic: Tirpitz' Radar
Replies: 60
Views: 27962

Re: Tirpitz' Radar

Could a FuMO 26 have picked up a squadron of Lancasters at 150km? Most likely. We have a base line for Seetakt picking up aircraft from the Dec 1939 air raid against the Wilhelmshaven anchorage. Seetakt picked up the bombers at 113 km. At that time the power output for Seetakt was only 2 kilowatts ...
by Siegfried
Fri Dec 30, 2016 4:43 am
Forum: Naval Weapons
Topic: Modern AAA
Replies: 5
Views: 5031

Re: Modern AAA

Gentlemen, I wonder about modern AAA effectiveness and I'm looking about data to guesstimate it. In 'Naval Antiaircraft Guns& Gunnery', Norman friedman states that - A simple, optic director improves the effectiveness fo Bofors and Oerlikon by 50%. - Late-war fire control and radar improve the effe...
by Siegfried
Thu Dec 29, 2016 3:41 pm
Forum: Naval Weapons
Topic: Tirpitz' Radar
Replies: 60
Views: 27962

Re: Tirpitz' Radar

but I didn't know that they made radar sets late in the war that actually outperformed the late war allied sets so comprehensively. ☺ Snip Fritz Trenkle was of the opinion that the FuMO26 sets on Tirpitz were actually FuMO34 sets with 125kw of power. I'm not so sure. For one thing the modulators fo...
by Siegfried
Thu Dec 29, 2016 3:40 pm
Forum: Naval Weapons
Topic: Tirpitz' Radar
Replies: 60
Views: 27962

Re: Tirpitz' Radar

but I didn't know that they made radar sets late in the war that actually outperformed the late war allied sets so comprehensively. ☺ Snip Fritz Trenkle was of the opinion that the FuMO26 sets on Tirpitz were actually FuMO34 sets with 125kw of power. I'm not so sure. For one thing the modulators fo...
by Siegfried
Wed Dec 28, 2016 4:59 pm
Forum: Naval Weapons
Topic: Modern AAA
Replies: 5
Views: 5031

Re: Modern AAA

Gentlemen, I wonder about modern AAA effectiveness and I'm looking about data to guesstimate it. In 'Naval Antiaircraft Guns& Gunnery', Norman friedman states that - A simple, optic director improves the effectiveness fo Bofors and Oerlikon by 50%. - Late-war fire control and radar improve the effe...
by Siegfried
Wed Dec 28, 2016 7:47 am
Forum: Naval Weapons
Topic: Best and Worst Torpedo WW2
Replies: 23
Views: 9208

Re: Best and Worst Torpedo WW2

The Km had issues with their torpedoes early on as well. The German torpedoes during the Narvick campaign (British operation Wilfred, the invasion of Norway at Narvick to cut of German iron ore supplies in 1940) were very unsatisfactory. 1 Magnetic pistol was unreliable. 2 Mechanical pistol was unr...
by Siegfried
Thu Feb 14, 2013 8:27 pm
Forum: Hypothetical Naval Scenarios
Topic: Could the Type XXI U-boat have won the war?
Replies: 64
Views: 18299

Re: Could the Type XXI U-boat have won the war?

I might add to the discussion that if the Type XXI was operational in 1943 then its impact would not be confined to the Atlantic or Arctic convoy battles, though those would be the critical battle areas. It is likely that a number of these subs would be sent further afield, into the Indian Ocean an...
by Siegfried
Thu Feb 14, 2013 8:16 pm
Forum: Hypothetical Naval Scenarios
Topic: Could the Type XXI U-boat have won the war?
Replies: 64
Views: 18299

Re: Could the Type XXI U-boat have won the war?

Thanks Dave, A.O.Bauer a Historian of German Electronics (including WW2) has written a paper in which he argues that the Germans produced between 500 and 1000 microwave radars. He notes that bombing severely damaged the Hareous Vacuum Schmelze works cutting of the supply of permanent magnets materia...
by Siegfried
Wed Feb 13, 2013 8:24 pm
Forum: Hypothetical Naval Scenarios
Topic: Could the Type XXI U-boat have won the war?
Replies: 64
Views: 18299

Re: Could the Type XXI U-boat have won the war?

If the TypE XXI could have been advanced two years, by which we mean entering trials service in early 1943, being debugged by mid to late 1943 with a large wave of production line u-boats entering service at that time it is in my opinion that the Arctic routes to Murmansk as well as the US to UK Atl...
by Siegfried
Sun Jan 20, 2013 5:51 pm
Forum: Naval Weapons
Topic: Question about RPC firing while turning the ship
Replies: 37
Views: 12455

Re: Question about RPC firing while turning the ship

Yes indeed, the gyroscopes via pickoffs passed their signal to magnetic amplifiers which operated electro hydraulic valves to operate the gun elevation via hydraulics (and presumably yaw as well) and controlled variable speed electric drives to operate the traverse. The gun mount was fully power con...
by Siegfried
Sat Jan 19, 2013 8:22 pm
Forum: Naval Weapons
Topic: Question about RPC firing while turning the ship
Replies: 37
Views: 12455

Re: Question about RPC firing while turning the ship

The distinction between gyro stabilising a gun mount and RPC (Remote Power Control) must be made, they are distinct. For instance the 10.5cm FLAK gun mounts on German capital ships were tri-axially stabilised and articulated. The gun mount could not only traverse and elevate but the guns could yaw i...
by Siegfried
Sat Dec 17, 2011 8:56 am
Forum: Bismarck General Discussion
Topic: Impact of dead radar on Bismarck's defence against Sworfish
Replies: 2
Views: 1667

Impact of dead radar on Bismarck's defence against Sworfish

On occaision much has been written on the impact on the Battle of the Denmark Straights of Bismarcks radar/s being out of action due to shock damage from a short battle with HMS Suffolk. Prinz Eugen took the lead to provide forward coverage since it was Bismarcks forward radar that had failed thus l...
by Siegfried
Sat Dec 10, 2011 11:42 pm
Forum: Naval Weapons
Topic: Fire Control in WWI
Replies: 3
Views: 2483

Re: Fire Control in WWI

It's worth looking at Carl Joesph August Michalke of Chorlotenbrug Germany 1897 patent for the selsysn.
These were used to transmit bearings within German ships. US Paten 684 579 was received.

http://www.google.com/patents/about/684 ... 5lAAAAEBAJ
by Siegfried
Wed Nov 30, 2011 11:48 pm
Forum: Naval Weapons
Topic: World War II Japanese radar
Replies: 47
Views: 39579

Re: World War II Japanese radar

The article Japanese Radar development prior to 1945 by "Shigeru Nakajima" has photographs of the M312 magnetron used in the type 22. These were water cooled magnetrons in glass tubes. There are also photographs of all metal magnetrons developed in 1941 (not fielded due to metals shortages) and an a...