Search found 3905 matches

by dunmunro
Fri Aug 09, 2019 9:39 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 2570

Re: 3-shaft propulsion

Just for the record, where is this data from? Regards The Design and Construction of British Warships, 1939-1945: The Official Records : Major Surface Warships by DK Brown. Hello Duncan did DK Brown mentioned the heating value/ density of the used fuel oil for instance the german fuel oil used to c...
by dunmunro
Tue Aug 06, 2019 7:48 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 2570

Re: 3-shaft propulsion

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 and Burt's updated b...
by dunmunro
Tue Aug 06, 2019 7:09 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 2570

Re: 3-shaft propulsion

marcelo_malara wrote:
Tue Aug 06, 2019 6:47 pm
Thorsten Wahl wrote:
Tue Aug 06, 2019 6:46 am
Howe_endurance1.jpg
What book is this from?

Regards
British Battleships of World War two, by Raven and Roberts.
by dunmunro
Tue Aug 06, 2019 7:07 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 2570

Re: 3-shaft propulsion

marcelo_malara wrote:
Tue Aug 06, 2019 6:46 pm
dunmunro wrote:
Mon Aug 05, 2019 7:12 pm

KGV recorded .715 lb/shp during trials and 111700shp = 35.65 tons/hr.
Just for the record, where is this data from?

Regards
The Design and Construction of British Warships, 1939-1945: The Official Records : Major Surface Warships by DK Brown.
by dunmunro
Mon Aug 05, 2019 8:19 pm
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 401

Re: Early RDF Type 284 Radar Performance

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 According to Howse these cruisers had been fitted wi...
by dunmunro
Mon Aug 05, 2019 7:12 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 2570

Re: 3-shaft propulsion

marcelo_malara wrote:
Fri Aug 02, 2019 10:26 pm
Can you post those numbers from KGV?

Regards
KGV recorded .715 lb/shp during trials and 111700shp = 35.65 tons/hr.
by dunmunro
Mon Aug 05, 2019 7:05 pm
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 401

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 dunmunro
Mon Aug 05, 2019 2:09 am
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 401

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 re...
by dunmunro
Sat Aug 03, 2019 5:58 pm
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 401

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 dunmunro
Sat Aug 03, 2019 3:02 am
Forum: Bismarck General Discussion
Topic: Early RDF Type 284 Radar Performance
Replies: 15
Views: 401

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 was...
by dunmunro
Fri Aug 02, 2019 8:51 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 2570

Re: Battleship Bismarck: A Design and Operational History

Thanks, I will give a look to that book. Anyway, consumption numbers do not look good either. According to a table on Koop´s, page 28 of the English edition, Bismarck at 138000 hp, 265 rpm, attained 29 knots with a consumption of 325 g/hp/hr, that would be 44.85 metric t per hour. USS Massachusetts...
by dunmunro
Thu Aug 01, 2019 5:08 am
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 2570

Re: Battleship Bismarck: A Design and Operational History

marcelo_malara wrote:
Thu Aug 01, 2019 3:15 am
So it would be lighter than KGV´s?

Regards
Yes, and it directly compares the weight of a 3-shaft versus a 4 shaft powerplant with the same output.
by dunmunro
Thu Aug 01, 2019 2:28 am
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 2570

Re: Battleship Bismarck: A Design and Operational History

There are three items in the destroyer´s weights labeled machinery/auxiliary machinery in Whitley´s book, don´t know exactly what is each. For a proper comparison I would turn to battleship´s machinery. According to Burt KGV´s machinery weighted 2700 t, for 110.000 hp at 400 psi (27 kg/cm2). Garzke...
by dunmunro
Mon Jul 29, 2019 6:34 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 2570

Re: Battleship Bismarck: A Design and Operational History

marcelo_malara wrote:
Mon Jul 29, 2019 5:31 pm
Brooklyn class for example, 100.000 hp could be achived with two shafts.
USS Brooklyn (CL-40) had 4 shafts.
by dunmunro
Thu Jul 25, 2019 7:56 pm
Forum: Bismarck General Discussion
Topic: Battleship Bismarck: A Design and Operational History
Replies: 59
Views: 8881

Re: Battleship Bismarck: A Design and Operational History

Since Mr. Jurens is a member of this board, I wonder if he could interject here and explain the reasons for the above-mentioned shortcomings? I do find it odd that with authors of such engineering backgrounds the end result is not THE engineering bible on the ship. I'm not sure it is fair to ask qu...