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by Bill Jurens
Sun Apr 14, 2019 5:25 pm
Forum: Bismarck General Discussion
Topic: PoW shell splash
Replies: 46
Views: 1220

Re: PoW shell splash

So far as the height of shell splashes is concerned, having observed a few, I think it would be fair to say that they tend to be reasonably constant from shell to shell, but that the general average height seems to vary a bit depending upon conditions. So 'high' splashes might be common one day, wit...
by Bill Jurens
Sun Apr 14, 2019 6:07 am
Forum: Bismarck General Discussion
Topic: PoW shell splash
Replies: 46
Views: 1220

Re: PoW shell splash

The photograph is very poor from a photogrammetric standpoint, but assuming reasonable values for the heights of Bismarck and the shell splash, it would appear that the splash is about 1/3 of the way to Bismarck. Plus or minus quite a bit.

Bill Jurens
by Bill Jurens
Sat Apr 13, 2019 3:57 pm
Forum: Bismarck General Discussion
Topic: PoW shell splash
Replies: 46
Views: 1220

Re: PoW shell splash

The abbreviation "A&A", need not in any way be considered offensive; it's just an acronym. In order to save time, have used terms like "the B/V hypothesis" (where "B/V" = "Bonomi/Virtuani" ) myself, and can assure you no offense was intended. I honestly did not know what "D&S" referred to, which is ...
by Bill Jurens
Sat Apr 13, 2019 8:15 am
Forum: Bismarck General Discussion
Topic: PoW shell splash
Replies: 46
Views: 1220

Re: PoW shell splash

"D&S"?

Bill Jurens
by Bill Jurens
Thu Apr 11, 2019 6:13 pm
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

Wandinga wrote: It would be nice to hear from a somewhat wider selection of readers regarding their overall evaluations of the hypotheses presented my [sic] Mssrs. Bonomi and Virtuani. It is my assumption that their votes would be 'proven' and 'proven', but that's technically just speculation I do h...
by Bill Jurens
Wed Apr 10, 2019 7:07 pm
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

I would concur with immediately previous posts and suggest that, insofar we have now reached the stage where we simply seem to be arguing about what we are arguing about, this particular thread be closed. I would therefore propose a voluntary closure to take effect 24 hours from now, i.e. at 12 noon...
by Bill Jurens
Tue Apr 09, 2019 3:42 pm
Forum: Bismarck General Discussion
Topic: Hit on Bismarck's turret
Replies: 7
Views: 520

Re: Hit on Bismarck's turret

I am not certain why these splinters -- if they existed at all -- might be of any particular significance, i.e. I don't think I quite understand the question. Might you elaborate or rephrase, please?

Bill Jurens
by Bill Jurens
Tue Apr 09, 2019 3:38 pm
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

So far as effectiveness is concerned, I would again suggest the old 'Shots Per Gun Per Minute' (SPGPM) and 'Hits Per Gun Per Minute' (HPGPM) as something worth considering. Although at this stage what information of historical value might be extracted from these numbers remains problematical. Just n...
by Bill Jurens
Mon Apr 08, 2019 9:43 pm
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

I have had to again make rather extensive deletions and editorial changes to various comments. I would ask participants to refrain from using emojis, bolding, all-caps or underlining in postings, as in most cases these add little or nothing to the discussion and only serve to inflame other participa...
by Bill Jurens
Sun Apr 07, 2019 2:02 am
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

Without seeing the original negatives, etc., it's difficult to tell. Technically, we don't even know if the filming was done in 16mm or 35mm format, although these were (usually) about the same aspect ratio. (As I recall, one was about 1.34:1 while the other was about 1.37:1, but that's just recolle...
by Bill Jurens
Sat Apr 06, 2019 1:44 am
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

Northcape has suggested this thread be closed as futile. Because the discussion still seems fairly lively and has remained at least tolerably civil, I will allow it to remain open for now.

Bill Jurens.
by Bill Jurens
Fri Apr 05, 2019 11:26 pm
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

With respect to some of my previous analysis Mr. Virtuani wrote: Where is this value coming from, please ? AFAIK, the German 15" gun had a shell angle of fall of 10°-11°at 15000 meters. This would match very well with the PoW damage report, that estimated 9°. My statement was "Depending upon quibble...
by Bill Jurens
Fri Apr 05, 2019 8:14 pm
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

HMSVF wrote: "One last question if I may!? Would a say a 110 metre difference still constitute a straddle ? Or would the gunnery officer recalculate for 100 metres down?" Making some reasonable assumptions would suggest that Bismarck's expected average pattern size at the ranges we are talking about...
by Bill Jurens
Fri Apr 05, 2019 4:15 pm
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

HMSVF wrote: "Are the shell splashes short or long? If they are short doesn't that mean that the shell which went through the compass platform had a completely different angle of fall than the rest of the salvo, I mean the compass platform was way up high in the bridge structure, I'd imagine it didn...
by Bill Jurens
Fri Apr 05, 2019 3:37 am
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 14428

Re: PoW's gunnery VS BSM's gunnery

You may not be missing anything. It could be that the terms 'open' and 'closed' with respect to 'A-arcs' involved components of both a physical and operational nature. So although the A-might have been physically open, i.e. there was no danger of shooting off intervening superstructure, they might h...