Dispatches from the Front  pg. 4

was, namely 289 BHN.  I guess I could keep on comparing different guns. 

October 28, 2015
In case you are curious on how I determine gun penetration.  I use a computer program that averages as many good data sets as I can find.   They have to be unique and are normalized to the US standard V50 criteria.   However the sets are also adjusted to an armor hardness of 270 BHN.  Which is close to the German test armor quality of 80-105 kg/mm2 of 244-303 BHN or avg. of 267 BHN. Unlike others I don't use DeMarre* nor some other formula to come up with my own values.  It is hard enough just trying to normalize the official data from different national tests and I don't want to come up with speculative factors to account for shell design or nose hardness.
   An example: the Soviet 85mm S-53 tank cannon. The colored lines represent a single data set, the black line represents the average of 5 sets.  The final values are rounded to the nearest centimeter and ranges given depending on what game they are for.
*Note - Each country may individually be applying DeMarre's formula to their test results to fill out their firing table data. Thus the average may be an average of how well this was accomplished.  I have no control of that.

September 28, 2015
Area Fire Artillery Templates are now in the form of a PDF.

September 17, 2015
I have logged a number of links to the reference pages from forum discussion sites dedicated to War Thunder and World of Tank games. Tracing these back to the links it now shows more informed discussions on those forums.  Which is one reason I made the pages.  Another good thing is this helps increase reference material.  In fact I found some new information on these pages which I can incorporate in a new page here.  See Russian Gun Accuracy 2 page 35.

June 17, 2015
We had a weird down time.  The domain disappeared from world servers for about 24 hrs.  Made me think about when this site ends.  June 8 2016 the registration name expires.  I don't think I'll renew so save your copies.
Plus we are a big source for references for War Thunder and World of Tanks.

May 18, 2015
In order to model the 122mm gun tables for the BR-471B D-25T and D-25 I had to add a ballistic coefficient taper function.  I don't know why but the 1960 DDR (Deutsche Democratic Republic aka East Germany) 781 m/s table needed to be tapered at 5.8 x that of the 795 m/s Soviet table.  It seems very odd that 14 m/s would require any change at all.  Regardless these firing tables can be modeled with my Ballistic Accuracy program.  link

Mar 31, 2015
I'm slowly making my way updating the gun charts.  I'm adding the "K" ballistic factor to the table so I know what I used to generate the data.  Right now I'm working through the German tables but haven't done all of the guns yet.

Mar 26, 2015
New Reference page of Aberdeen data on 75mm guns. Page 48.

Mar 24, 2015
The 2015 March Madness program for the final 16 is here.

Mar 21, 2015
I've been running some tests to double check the ballistics of some shells.  I have some data tables on Russian guns that look like they were made during WII or right after.  Working backwards from terminal velocities to get the ballistic coefficients I find that the only solution agrees with the 'Ingalls' ogive G1 G‚vre drag function.   Which is odd in that this is for the older shaped shells, not the aerodynamic ballistic APBC shells.  I wonder if the firing tables were calculated numbers and not actual test results.  Later tables like the 1964 DDR and 1972 US protection tables for the 122mm shells have G7 (tangent ogive) G‚vre drag function solutions.   I need more data to come to a conclusion.

Mar 8, 2015
Thanks again to
Jeff who sent me post WWII US documentation on Japanese guns.  I'm organizing the different types of guns, especially the 8 varieties of 37mm types.  Ballistics sources on Japanese weapons are a bit thin so this helps a great deal.  I'll make another update of Japanese guns in a few days.

Mar 5, 2015
Jeff sent a update to his Panzer War MS-Access program that automates game play.

February 1, 2015
Updated Japanese gun data table.

January  31, 2015
I made a quick update of some data on the Japanese tables.      Then realized I hadn't updated then in 10 years.  I have acquired new sources in that time.  Also I am now converting to the Ballistic formula that I use in other table.  This is on going as there still is conflicting data that I am sorting through.  This ought to take a week to complete.

November 25, 2014
Thanks to some posts on the Archives I found some additional information on some guns.  The introduction of Pzgr. 39 APHE shell was not a clear as we have it.  One test of the PaK 38 in 1941 against the T-34 shows it being used.  But in June 1942 the older Pzgr. 38 AP was used. It's just too complicated to have a load of both shells in the game we have to set a clear date even though it was probably introduced when existing stocks of the older shells were used up.  Note both of these were APHE but sometimes refer to early shells as AP to lessen confusion.

November 13, 2014
I'm looking into updating
some of the Airland files after all these years.  My German AFV data is a little behind the times.  It looks like there is not agreement even with the 1960 era tanks to what is out now.  I'll have to check if the old data is bad or there were modifications in the tanks.

November 6-7 2014
Main menu changes. 

November 3 2014
Doing some site cleaning around here.  I've deleted some images from some folders that aren't needed for site references but are linked to by various bots, forums and search engines. It is annoying a bit to see Google download Okun's naval armor slope multiplier table jpg in an Australian roof pitch slope search.  I don't need to support these with my bandwidth.

November 2 2014
I looked into finding the exact area of the cast girder that joins the front hull plates on the T-34.  I've fiddled with the values for this over years.  A US publication gives a cross-section of two types.  The older cast type is rounder and covers a larger area.  The newer type is has more of an angle but doesn't attribute much to the overall area protected.