Search found 13 matches

by garder
Sun Nov 10, 2013 9:00 pm
Forum: Naval Technology
Topic: British Fire-control and time of flight
Replies: 34
Views: 15512

Re: British Fire-control and time of flight

Interesting. Thanks for posting it.

Just to be clear. A 6M RuM is a rangefinder with a 6 m. basis, correct?
by garder
Sat Nov 09, 2013 2:30 pm
Forum: Naval Technology
Topic: British Fire-control and time of flight
Replies: 34
Views: 15512

Re: British Fire-control and time of flight

The above was an RN test. The problem with combat reports is that the gun is also being used as an RF, through the use of spotting corrections. From von Hase Kiel and Jutland page 132: “ the Bg. Officer will report the change of range per minute calculated from the difference of the range-finder re...
by garder
Fri Nov 08, 2013 11:29 am
Forum: Naval Technology
Topic: British Fire-control and time of flight
Replies: 34
Views: 15512

Re: British Fire-control and time of flight

So that represents about 7500 recorded observations for each RF (two stereo, two CI) and this was just one of 4 different trials. The number of recorded observations is a moot point. The design of the test is such, that we can learn nothing of the capability of the German wartime rangefinder system...
by garder
Thu Nov 07, 2013 1:47 pm
Forum: Naval Technology
Topic: British Fire-control and time of flight
Replies: 34
Views: 15512

Re: British Fire-control and time of flight

See: http://www.admirals.org.uk/records/adm/ ... 86-259.pdf , P.125 (P.49). That document tells us very little, if anything, about the capabilities of the German rangefinder system during the war. Firstly, though the stereoscopic range takers at the trial are described as having two years’ experien...
by garder
Tue Nov 05, 2013 7:43 pm
Forum: Naval Technology
Topic: British Fire-control and time of flight
Replies: 34
Views: 15512

Re: British Fire-control and time of flight

As to the Dreyer table having problems calculating the range rate, a good deal of that was due to the too narrow based range finders in British service and the poor visibility during the battle which made it difficult to obtain reliable range readings in the first place. Regarding the narrow base o...
by garder
Thu Oct 31, 2013 2:52 pm
Forum: Naval Technology
Topic: British Fire-control and time of flight
Replies: 34
Views: 15512

Re: British Fire-control and time of flight

According to the Handbook on Minor Fire Control Instruments, the Dumaresq instruments in fire control positions incorporated a deflection drum to give gun deflection without having to consult a table; this automatically allowed for times of flight and rotational drift. Thank you, I did not know tha...
by garder
Wed Oct 30, 2013 7:04 pm
Forum: Naval Technology
Topic: British Fire-control and time of flight
Replies: 34
Views: 15512

Re: British Fire-control and time of flight

Thanks for taking the time to respond to my question. one would use the Dumaresq calculator to obtain range rate or rate of change and gun order deflection from a built in range drum. The Vickers Range clock would be fed with range estimates from range finders, enemy course and speed estimates, own ...
by garder
Tue Oct 29, 2013 5:29 pm
Forum: Naval Technology
Topic: British Fire-control and time of flight
Replies: 34
Views: 15512

British Fire-control and time of flight

Hello I have a question that I hope someone can help me with. How did the British fire control system handle the time-of-flight of the grenade? Time of flight is probably the most important reason why gun range and clock range differ. But how did the British introduce time of flight into their syste...
by garder
Sat Mar 17, 2012 6:06 pm
Forum: Naval Technology
Topic: British v German rangefinders
Replies: 82
Views: 46438

Re: British v German rangefinders

Hi Regarding the accuracy of german v. british rangefinders it could be interesting to compare what degre of error was allowed to pass the british and german rangefinder courses. According to: Naval Staff Intelligence Department, German Gunnery Information Derived from the Interirogation of Prisoner...
by garder
Sat Jan 14, 2012 12:54 pm
Forum: Naval Technology
Topic: German rangefinders WWI
Replies: 8
Views: 4760

Re: German rangefinders WWI

Thanks Nillson and Wahl, very helpful references. Generally I think it is less complicated to establish the number and type of rangefinders on the later ships (Bayern class, Hindenburg) than the earlier classes, because they didn´t change so much doing the war. In the coming week I will order some g...
by garder
Wed Jan 11, 2012 11:13 pm
Forum: Naval Technology
Topic: German rangefinders WWI
Replies: 8
Views: 4760

Re: German rangefinders WWI

Hi Delcyros Thanks for your answer. I had not thought of that. I am danish and my german could be better so it is possible that I have misunderstod something. Turret RF of 28cm turrets in ww1 were typically 3m devices (possible exceptions are the battlecruisers), the GCT devices were 3m for these sh...
by garder
Wed Jan 11, 2012 10:58 pm
Forum: Naval Technology
Topic: German rangefinders WWI
Replies: 8
Views: 4760

Re: German rangefinders WWI

Thanks for answering Buron Angel. I agree that at least the Helgoland class the recieved larger rangefinders during the war. But from the photos I would say that even the new ones wouldn´t have a base-length of more than 4 m. Do you know of any sources that list which ships recieved longer rangefind...
by garder
Tue Jan 10, 2012 11:07 pm
Forum: Naval Technology
Topic: German rangefinders WWI
Replies: 8
Views: 4760

German rangefinders WWI

Hi I have been doing some research on german naval artillery and fire control from 1906-1918. Since this is a subject with very little english littearture, I hope you would like to discuss some dissimilarities I have found with me, concerning german rangefinders, there size (base-length) and numbers...