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Intermediate ballistics of 120 mm calibre mortar projectile is investigated experimentally by SL-520PE Weibel’s Doppler radar system and described theoretically. The complex has such technical characteristics: measured velocity value is from 30 to 10,000 m/s; measured relative precision is 0.05%. Programme application WinDopp 2017 is used. The study uses data obtained during 14 months MP-120 mortar field tests at surrounding temperature from −12 °C to +24 °C. The mortar shots daily number varied from 10 to 110. The intense fire rate for the first, second and third tests minute was 7 rounds per minute on some days. Average fire rate was one shot per minute by mortar projectiles. A theoretical method to calculate changing muzzle velocity v0/v0tab relative value dependently on shot number is proposed. It was found according to field tests results and analysis of literature sources that mortar projectiles in a new barrel “whistle” at frequency of about 5,000 Hz and they “buzz” at a frequency of about 400 Hz in an unusable one. The lateral stabilization force begins to act when the hot gunpowder gases muzzle velocity is approximately twice the muzzle velocity of the mortar projectile. It is estimated that the lateral stabilization force range is about 60 m and the time is about 0.2 s.

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Mortar Projectile Intermediate Ballistics Experimental Investigations by SL-520PE Weibel System

  • 会议论文

  • 发表日期：

    2026年

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  • Mykhaylo Yarmolenko,
  • Viktor Nikitchenko,
  • Viktor Kuzmenko,
  • Yurii Veklenko

摘要

Intermediate ballistics of 120 mm calibre mortar projectile is investigated experimentally by SL-520PE Weibel’s Doppler radar system and described theoretically. The complex has such technical characteristics: measured velocity value is from 30 to 10,000 m/s; measured relative precision is 0.05%. Programme application WinDopp 2017 is used. The study uses data obtained during 14 months MP-120 mortar field tests at surrounding temperature from −12 °C to +24 °C. The mortar shots daily number varied from 10 to 110. The intense fire rate for the first, second and third tests minute was 7 rounds per minute on some days. Average fire rate was one shot per minute by mortar projectiles. A theoretical method to calculate changing muzzle velocity v0/v0tab relative value dependently on shot number is proposed. It was found according to field tests results and analysis of literature sources that mortar projectiles in a new barrel “whistle” at frequency of about 5,000 Hz and they “buzz” at a frequency of about 400 Hz in an unusable one. The lateral stabilization force begins to act when the hot gunpowder gases muzzle velocity is approximately twice the muzzle velocity of the mortar projectile. It is estimated that the lateral stabilization force range is about 60 m and the time is about 0.2 s.