Search found 3911 matches

by dunmunro
Sun Nov 10, 2019 7:15 pm
Forum: Naval Weapons
Topic: Fuze delay in aerial antiship bombs
Replies: 5
Views: 145

Re: Fuze delay in aerial antiship bombs

Hi guys. I am looking for delay times. Contrary to artillery shells, which activated on impact and had a delay of about 10 milliseconds to the explosion, aerial bombs seemed to have a very long 8-15 seconds delay, don´t even know if the delay is post impact or post launching. Does anyone have info ...
by dunmunro
Fri Nov 08, 2019 7:57 pm
Forum: Bismarck General Discussion
Topic: Alan Raven comment re PoW @ Denmark Strait
Replies: 4
Views: 195

Re: Alan Raven comment re PoW @ Denmark Strait

In the course of leafing through my hoary old 1972 copy of "ENSIGN 1 - King George the Fifth Class Battleships" by Alan Raven, I ran across an odd comment that I do not recall having been discussed. If I'm wrong, please update me. If not, here is the passage from "page 4" (book is actually not pagi...
by dunmunro
Thu Nov 07, 2019 12:58 am
Forum: Bismarck General Discussion
Topic: New Winklareth book on Bismarck
Replies: 5
Views: 219

Re: New Winklareth book on Bismarck

Go here - https://www.amazon.com/Battle-Denmark-Strait-Critical-Bismarcks-ebook/dp/B00AA0BVE4/ref=cm_cr_arp_d_product_top?ie=UTF8 Received a decent and detailed review in the latest Mariner's Mirror (review is worth reading if you are a subscriber - much better than most Amazon "reviews"). Byron Th...
by dunmunro
Tue Oct 08, 2019 2:46 am
Forum: The Age of Sail (1571-1860)
Topic: The USN vs. the Royal Navy
Replies: 9
Views: 392

Re: The USN vs. the Royal Navy

I am NOT trying to start a flame war here gents. In combat vs. each other, both sides gained plenty of laurels. Both sides were the best (ship v. ship) that the other ever faced. Why did the USN do so much better vs. the RN than anyone else? You would think that the French (with their money, histor...
by dunmunro
Thu Sep 19, 2019 10:43 pm
Forum: Bismarck General Discussion
Topic: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940
Replies: 28
Views: 1191

Re: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940

That's an interesting question. In practical terms, I don't think that fuel oil quality would have affected trial results at all, or at least not in any meaningful fashion, as -- provided one is willing to equate 'quality' with 'efficiency' -- all that would happen would be that poorer quality fuel...
by dunmunro
Thu Sep 19, 2019 7:55 pm
Forum: Bismarck General Discussion
Topic: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940
Replies: 28
Views: 1191

Re: FYI: meaning of the notation of the draft measurements during Bismarck’s trial runs, fall 1940

I wonder if anyone can present more information regarding the fuel oil quality used during Bismarck's trials?
by dunmunro
Fri Aug 09, 2019 9:39 pm
Forum: Bismarck General Discussion
Topic: 3-shaft propulsion
Replies: 115
Views: 3855

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: 3855

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: 3855

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: 3855

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: 638

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: 3855

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: 638

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: 638

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: 638

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...