May 9, 2019
I added a new page explaining the problems of the 152mm gun data. Link
May 8, 2019
Trying to produce my own firing tables for the 152mm shells I find that Wiki has a lot of wrong data. I don't know how many times I had to make a redo on my Russian tables and PW tables. Finally had to rely on CIA pdfs of Russian data.
May 7, 2019
I came across two original documents on the Russian 152mm gun/howitzer. The earlier one of 1937 report of the ML-20 updated and released in 1944. This has a firing table of the BR-540 AP shell without striking velocities but with time-of-flights which are impossible as the time for the first 500m is the same as from 1500-2000 range. In effect the shell does not lose velocity in its first 2000 meters. This report has a penetration table based on the Demarre formula of the standard K=2400 type. Solving for velocity using this table gets some incredible numbers as well.
The other document is a 1943 report of the 152mm ML-10 updated and released in 1968. This has a firing table of the BR-540 AP shell with striking velocity as well as realistic time of flight. So this appears to have good numbers. I can use the ballistics of the ML-10 BR-540 for the BR-540 of the ML-20. The velocity difference is only 40 m/s. What I may do is run both of these shells through NAAB and see what I get.
April 19, 2019
NAAB has been updated.
April 13, 2019
I updated the tank gun tables for the German, Russian, USA, and UK. This reflects accuracy calculations of guns based on optics.
April 9, 2019
My run for the March Madness this year chose Gonzanga to win but Virginia to come in second. As they say missed it by that much.
March 20, 2019
March Madness 2019. I worked up the data for March madness computer program again this year. A couple of teams are to be determined but they are down the list.
March 5, 2019
There is an entertaining video on Youtube comparing the Panzer III with the early T-34. Link The problem is they got a few things wrong. Like the Soviets didn't use the 76.2mm Pzgr. 39 rot shell. That was a German manufactured shell meant for captured Soviet guns. Also German sights didn't give them much of an advantage when the ballistics of their gun is taken into account. The lighter 50mm shell lost velocity faster than the heavier 76,2mm projectile. With the dispersion of both guns and the ballistic curve taken into account both would have about a 40% chance to hit each other from 840 meters.
BTW - I have some videos on Youtube as well if you follow 501Mobius
Something I've been trying to find is the ballistics of the pre-Pzgr 39 50mm AP shell. This had an ogive nose. The newer Pzgr. 39 had an AP cap that had a chiseled shape. Going by the relative ballistic differences in British 6 pdr AP vs APC and US 37 AP vs APC the ballistic coefficient of the APC would have a very small advantage over the AP.
Jan. 23, 2019
A new version of NaaB2 has been released. It has examples of tank and AT guns in the gun list. Also, it is modified to have optional shell quality assigned to individual shells. The quality tries to match US Army Aberdeen ballistic graphs. Other guns and shells for other armies are matches from these. The results were for US WWII class 'B' non-cemented 237 BHN steel armor. This is then normalized to 270 BHN armor. The data is here: link
Jan. 21, 2019
I had to redo the French. Italian and Polish calculated tables as I based the values on US shells. But I found the US ballistic graphs I used to calibrate the ballistics had problems.. I guess the later year graphs updated early war graphs but I had used the earlier ones as a basis for the shell data. I had to modify Naab2 so that it can read the shell quality from the Projinfo file. Also, the AP cap of medium hardness is lowered a little. I haven't updated this version for download yet. I'm still trying to get the ballistic coefficients correct.
Jan. 15, 2019
British and American gun penetration data pages added.
Dec. 24, 2018
Added small program (Red Star DeMarre) to calculate armor penetration or determine striking velocity using DeMarre formula as the Russians used it during WWII. Link to download page.
Dec. 19, 2018
NaaB is updated to 2.27. I got rid of some bugs and added Elevation and time of flight to the Ballistics page.