Search found 71 matches

by Brad Fischer
Thu Sep 11, 2008 5:25 pm
Forum: Hypothetical Naval Scenarios
Topic: RFC equipped Yamato vs. Iowa
Replies: 462
Views: 57599

Re: RFC equipped Yamato vs. Iowa

Wow, I’m surprised that this thread is still active. I think I’ll pass on the main topic of discussion but I’d like to comment on the hit probability model from Navweaps.com that Mr. Malara commented on above. That probability model comes from the Princeton University Statistical Research Group (SRG...
by Brad Fischer
Tue Dec 11, 2007 8:36 pm
Forum: Naval Weapons
Topic: Mk3 and Type 284 radar
Replies: 35
Views: 12273

Re: Just to spell things out

Brad, Both our Unit of Error tables appear to be extrapolated values derived through the magnification factors etc. Presumeably experiments were carried out to support this assumption. Because performance varies from individual to individual and within the same individual over time due to fatigue o...
by Brad Fischer
Tue Nov 20, 2007 4:31 pm
Forum: Bismarck General Discussion
Topic: Is Bismarck the best
Replies: 55
Views: 11294

Thank's Brad that's good to know. So the switch over was from mid 43. This was about one year ahead of when the British began phasing in Type 274. So the Mk3 alluded to was part of the MK40 director? What was it's purpose? A photo of New Jersey in the typhoon looks to show a Mk3 forward of the conn...
by Brad Fischer
Tue Nov 20, 2007 6:36 am
Forum: Bismarck General Discussion
Topic: Is Bismarck the best
Replies: 55
Views: 11294

There are refrences in BB62 documents to "the Mk3" radar in use as late as March 1944. This looks like a transitional period, as I'm sure that the forward unit was a Mk8 by this time. Nonetheless, Mk8 is also used in singular context at this time, as it reads "the Mk8", alluding to it as having fai...
by Brad Fischer
Mon Nov 19, 2007 7:37 pm
Forum: Bismarck General Discussion
Topic: Is Bismarck the best
Replies: 55
Views: 11294

I’m not certain that most large ships were still using the Mk 3. Almost all new construction received the Mk 8 although there were a couple Brooklyns and Clevelands that were still using the Mk 3 into late 1943. All the fast battleships had the Mk 8s by mid 1943 except Washington which had only one ...
by Brad Fischer
Mon Nov 19, 2007 7:19 pm
Forum: Naval Weapons
Topic: Mk3 and Type 284 radar
Replies: 35
Views: 12273

I have had the great pleasure of corresponding with Master Chief Skelley over the past few years. He was instrumental in our research and was great assistance for our Fast Battleship gunnery article that was in WI a couple issues ago. The letter to the editor that MC Skelley wrote was during his ear...
by Brad Fischer
Tue Nov 13, 2007 9:03 pm
Forum: Naval Weapons
Topic: Mk3 and Type 284 radar
Replies: 35
Views: 12273

Re: Just Read the Warship Int article again- Oh thaat Brad F

What does seem clear is that by 1945 radar has become the primary source of information for both functions. I am still trying to home in on the relative performance of the two techniques, as I think Brad's examples suggest at least the Mk 3 was no better at 20,000yds than optical rangefinding with ...
by Brad Fischer
Sun Nov 04, 2007 1:58 pm
Forum: Naval Weapons
Topic: Mk3 and Type 284 radar
Replies: 35
Views: 12273

Re: Excellent posts from very knowledgeable posters

Tiornu wrote:How does a scartometer differ from a rangefinder?
I’m not sure. Who used them besides the Italians? Russians perhaps?

Brad
by Brad Fischer
Sun Nov 04, 2007 2:27 am
Forum: Naval Weapons
Topic: Mk3 and Type 284 radar
Replies: 35
Views: 12273

The radar displays and the operators were located inside the directors in USN practice. With Mk3 for example, the radar operator for bearing controled the traverse of the director. This way he could control the lobe switching procedures. In the Royal Navy, the radar office and the operators for the...
by Brad Fischer
Fri Nov 02, 2007 12:35 am
Forum: Naval Weapons
Topic: Mk3 and Type 284 radar
Replies: 35
Views: 12273

Re: Excellent posts from very knowledgeable posters

Gentlemen, Can I just clarify my understanding on one or two items? For radar ranging on a hard, good return target like a ship, +/- 40 yards sounds about right, because we are talking about transmission and re ception timing on a very accurate basis, related of course to frequency. Once we start b...
by Brad Fischer
Wed Oct 31, 2007 4:06 pm
Forum: Naval Weapons
Topic: Mk3 and Type 284 radar
Replies: 35
Views: 12273

The USN also rated “reliable ranges” as an S:N ratio of 4:1 or 2/3rds of maximum, quite similar to the RN. BuOrd’s assessment of the Mk 3’s spotting ability is mixed. The initial assessment was quite glowing particularly from the ships themselves with its introduction. However as the war progressed,...
by Brad Fischer
Tue Oct 30, 2007 10:31 pm
Forum: Naval Weapons
Topic: Mk3 and Type 284 radar
Replies: 35
Views: 12273

Hi Dave, Are you working off of theoretical calculations or source documentation? I have two Type 284 manuals covering the basic Type 284 and the Type 284M/P (HANDBOOK on the USE OF RADAR FOR GUNNERY PURPOSES G.S. SET – TYPE 284. 1944). Both documents state clearly that the bearing resolution is +/-...
by Brad Fischer
Tue Oct 30, 2007 9:56 pm
Forum: Hypothetical Naval Scenarios
Topic: RFC equipped Yamato vs. Iowa
Replies: 462
Views: 57599

I agree strongly with Dave Saxton in that this thread has spiraled beyond the point of relevant discussion but I will interject at least once more to give a more accurate account. When discussing failure of the Mk 8 radar, the latest account is at but one event. Battleships equipped with Mk 8 radars...
by Brad Fischer
Wed Oct 17, 2007 2:54 am
Forum: Hypothetical Naval Scenarios
Topic: RFC equipped Yamato vs. Iowa
Replies: 462
Views: 57599

Skulski´s quotation: Yamato was equipped with a Type 98 low angle fire control system - the ultimate in Japanese low angle fire control installation and specially designed for the Yamato class battleships. The principal parts of this installation were as follows: Four 15m rangefinders, one on top o...
by Brad Fischer
Tue Oct 16, 2007 5:38 pm
Forum: Hypothetical Naval Scenarios
Topic: RFC equipped Yamato vs. Iowa
Replies: 462
Views: 57599

It´s 15m rangefinders were stereoscopic and the one over the bridge was a triple one. But the important feature is the quality of these rangefinders, which were the best, allowing exceptional range estimation and a high degree of accuracy in shooting, "usually bracketing the target with EARLY SALVO...