Search found 1033 matches

by Byron Angel
Sun Aug 11, 2019 2:21 am
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 1539

Re: 3-shaft propulsion

OK Marcelo, Found it – CB1516(A) REPORTS ON INTERNED GERMAN VESSELS Part 1 – Constructive Details and Machinery "Main Machinery – These ships appear to be very well built, and from the manner in which the ships are subdivided they would be very difficult to completely put out of action. They are all...
by Byron Angel
Sat Aug 10, 2019 3:11 am
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 1539

Re: 3-shaft propulsion

Hi Byron. So there was a HP turbine coupled to a LP one which in turn coupled to the shaft? All in the same line? Regards Hi Marcelo, I cannot confirm that detail without more homework. The four shaft German BCs had two sets of machinery, with the high pressure turbines running the inner shafts and...
by Byron Angel
Sat Aug 10, 2019 1:05 am
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 1539

Re: 3-shaft propulsion

Guys, how were the turbines arranged in WWI three shaft German´s battleships? Hi Marcelo, Typically, three sets of turbines abreast, with each separated from its neighbor(s) by a longitudinal bulkhead. Additionally, each turbine set had its respective high and low pressure turbines in separate fore...
by Byron Angel
Wed Aug 07, 2019 8:47 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 1539

Re: 3-shaft propulsion

Dear pasoleati, Wow ..... a great deal of fire and passion on your part. I'm just wondering why you are directing such ire toward Bill Jurens. Bill did not write the rules of the academic research game; all he has done is describe how they currently work. Without academic credentials connecting you ...
by Byron Angel
Wed Aug 07, 2019 1:35 am
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 1539

Re: 3-shaft propulsion

See DK Brown's "Design and Construction of British Warships" regarding fuel consumption and endurance. There could be dramatic differences between trials values and actual wartime service values.

B
by Byron Angel
Tue Aug 06, 2019 7:28 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 1539

Re: 3-shaft propulsion

Howe_endurance1.jpg What book is this from? Regards British Battleships of World War two , by Raven and Roberts. - - - Hi Thorsten, [ 1 ] Were any displacement data provided in connection with the above-mentioned Howe endurance figures? [ 2 ] If one already possessed Friedman's book on British BBs ...
by Byron Angel
Tue Aug 06, 2019 12:18 am
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 263

Re: Early RDF Type 284 Radar Performance

Thanks dunmunro.

Byron
by Byron Angel
Mon Aug 05, 2019 7:24 pm
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 263

Re: Early RDF Type 284 Radar Performance

dunmunro wrote:
Mon Aug 05, 2019 7:05 pm
According to Howse the first 5 operational type 284s fitted to Battleships were Hood, KGV, PoW, QE and probably Nelson.
Is it possible to ascertain with any confidence whether those ships were likely the first five ships on any class so fitted?

B
by Byron Angel
Mon Aug 05, 2019 5:44 pm
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 263

Re: Early RDF Type 284 Radar Performance

If we include ranges from light cruisers, whose DCT mounted radar antennae were ~33% lower in height than a battleship's, then the ranges make sense, but they are not representative of actual ranges obtained by battleships in trials or in combat. A couple of thoughts - > CB4112(4) mentions that its...
by Byron Angel
Mon Aug 05, 2019 12:24 am
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 263

Re: Early RDF Type 284 Radar Performance

Daft question....
Do atmospherics make a difference to radar performance?
Yes. Meteorological conditions and other anomalies (such as atmospheric ducting), even sea state to a degree, can influence radar performance.

Byron
by Byron Angel
Mon Aug 05, 2019 12:20 am
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 263

Re: Early RDF Type 284 Radar Performance

Hi Dunmunro, > Tovey's report CB 4112(4) dates about a year after the early Nelson and Hood tests and purports to specify "maximum usable ranges" as opposed to maximum possible ranges, which implies analysis of data accumulated from sea service and battle practices. For example, from what I have rea...
by Byron Angel
Sat Aug 03, 2019 2:54 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 1539

Re: 3-shaft propulsion

The RN looked at double reduction gearing and wasn't impressed - at that time the efficiency savings weren't great and the costs and maintenance increase weren't thought to be worth it. Post-war reports basically stated the same with the big regret being lack of reliable high pressure boilers. The ...
by Byron Angel
Sat Aug 03, 2019 2:36 pm
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 263

Re: Early RDF Type 284 Radar Performance

These sound like ranges obtained from cruisers. Testing from Hood and actual results from KGV were somewhat better than those shown above. RA Burt provides a lengthy quote from Hood's type 284 radar trials in March-April 1941 at Scapa flow, which can be summarized briefly that continuous ranging wa...
by Byron Angel
Fri Aug 02, 2019 9:58 pm
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 263

Early RDF Type 284 Radar Performance

Some interesting information on the performance capabilities of the early marks of RDF Type 284 in surface gunnery applications CB 4112 (4) (1942) HANDBOOK ON THE USE OF R.D.F. FOR GUNNERY PURPOSES TYPE 284 Admiralty Gunnery Branch, SW1 – Dated 19th July 1942. quote - RANGING CAPABILITIES 4. The res...
by Byron Angel
Fri Aug 02, 2019 1:27 am
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 1539

Re: Battleship Bismarck: A Design and Operational History

So the RN got a 250 t saving going from 4 to three shafts, that make sense. We can also say that the 10% lighter German machinery came from a reduction of shafts. I can no longer see the benefits of the high pressure of German design. I do recommend that you consider reading the book I referenced i...