Wednesday 22 January 2014

ML-20 Artillery Tables

Continuing my collection of artillery tables, the model 1937 ML-20 gun-howitzer, which found a home in the SU-152 and ISU-152 Soviet SPGs. The ML-20 could fire several different types of ammunition. Here is the table for the BR-540 armour piercing shell:


The table confirms the impressive dispersion results from the test I posted: 20 cm vertical and 30 cm horizontal at 1000 meters. 

The next shell type is the naval high explosive semi-AP shell. At 1000 meters, it has the same dispersion as the AP shell.



Next is the OF-540 high explosive fragmentation long range steel gun grenade. Its scattering is much greater: 30 cm vertical and 70 cm horizontal at 1000 meters. This table has much greater ranges than the AP ones, capping out at over 17 kilometers.


Next is the concrete penetrating G-53 shell. It shares its table with the OF-530 high explosive fragmentation long range steel howitzer grenade and O-530A long range steel-iron grenade.


A little better, 20 cm vertically and 70 cm horizontally at 1000 meters. With the G-545 concrete penetrating shell, the dispersion gets even better: 20 cm and 50 cm respectively. 

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6 comments:

  1. Anonymous22 January 2014 at 20:39

    Any table like these on the Lend-Lease US 76mm?

    ReplyDelete
    Replies
    1. Peter23 January 2014 at 00:21

      Sadly, no. You might find this data in DTIC.

      Delete
  2. keshavkrishnamurty23 January 2014 at 00:13

    Could you translate the headings of each column? The last two are the vertical and horizontal dispersion, but what are the rest for?

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    Replies
    1. Peter23 January 2014 at 00:29

      AP: Range, sight, trajectory height, 6 columns of corrections, change in distance of where the shell lands per one thousandth tick, impact angle, flight time, dispersion.

      Half-AP: same.

      HE: Range, sight, detonator setting, trajectory height, 8 columns of corrections, range again, change in distance of where the shell lands per one thousandth tick, impact angle, narrow "fork", change in detonation height per one tick of the detonator, impact angle, flight time, dispersion for impact fire, dispersion for timed fire.

      Delete
    2. Anonymous23 January 2014 at 08:12

      Dispersion columns go vertical first then horizontal, right?

      Delete
  3. Mobius5 May 2019 at 16:03

    There seems to be an error in the first firing table (BR-540). It takes exactly the same amount of time for the shell to travel 0-500m as it does compared to 1500-2000m.
    Other shells slow down with range.

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