Dispatches from the Front pg. 2

whether or not they are in error or not.  It just requires more work to get my ballistic calculator to match the firing tables of these guns.  This is outside the equations of Robert McCoy who came up with the original programming of the ballistic program.  See page 52.

September 5, 2016
Since the Equivalent armor protection study may be a big deal I'm going to release my BHN Equivalent Armor Protection calculator.  See page 36.

September 2, 2016
A revelation. It looks like all US tables of captured German guns penetration and ballistics were done by the British.  The criteria and target armor specs changed in late war to coincide with US needs and maybe with US cooperation.   But tables once thought to originate at Aberdeen now appear to be copies of British Ordnance Board test data.  link

June 25, 2016
A new page on the German 50mm gun has been added.  Some problems I found in data   link

Jan 10, 2016
I updated Enigma 2 program to generate new Powerball number scheme  here. [zip]

December 15, 2015
My friend Joe (a contributor to Panzer War) has made his own set of rules that could be called Panzer War featherweight.   Free PDF of Kampfgruppe rules here. [zip]

December 2, 2015
Updated page 48 with two graphs of 75mm/L70 KwK 42 ballistics.  I compare Aberdeen data to German data for this gun.  Though there are questions with both data sets this is the best comparison that can be done with available sources.

November 14, 2015
For awhile it looked like the  Germans normalized their gun penetrations. That is adjusting the numbers by multiplying by a ratio factor depending on armor hardness quality.  If the 75mm/L70 table data is compared to the 75mm penetration graph it seemed like the armor hardness was normalized to 243 BHN.  But, when the data for the 75mm KwK 40 was compared in the same way the data showed that no normalizing took place.  The armor was what it 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