Influence of cartridge charge and air temperatures on the kinematic parameters of movement of the bullet released from the SVD

Authors

  • P. P. Tkachuck Національна академія сухопутних військ імені гетьмана Петра Сагайдачного, Львів, доктор історичних наук, професор, начальник Академії, Ukraine
  • L. D. Velychko Національна академія сухопутних військ імені гетьмана Петра Сагайдачного, Львів, кандидат фізико-математичних наук, доцент, професор кафедри інженерної механіки (ОТІВ), Ukraine https://orcid.org/0000-0003-0191-4843
  • I. V. Horchynskyi Національна академія сухопутних військ імені гетьмана Петра Сагайдачного, Львів, начальник факультету підготовки спеціалістів бойового (оперативного) забезпечення, Ukraine https://orcid.org/0000-0001-8133-8174

DOI:

https://doi.org/10.33577/2312-4458.20.2019.42-47

Keywords:

exterior ballistics of the bullet, influence of temperature both air and cartridge charge, crosswind, SVD

Abstract

In the paper, the effect of cartridge charge and air temperatures on the kinematic parameters of movement of  the bullet released in the air is investigated. It is established that an increase in the temperature of the charge of a cartridge or air contributes to a significant increase in the range of flying bullets, a slight increase in its speed and time of flight. Preferably, the air and charge temperatures are not the same; therefore, the effect of the change in the temperature of only the air or only the charge on the dynamics of the bullet was studied.  It has been  established that  the value of the temperature of the charge of the cartridge, exceeding the air temperature, affects the kinematic parameters of the bullet  movement during shooting at a distance of up to 600 meters; when shooting at a distance of 700-900 meters, the effects of charge and air temperatures on the movement of the bullet are almost identical; when shooting at a distance of more than 900 meters, the prevailing influence on the kinematics of the movement of the bullet becomes the temperature of the air.  If the temperature of the cartridge and air charge is the same or higher than 15° C, then the theoretical range of the flying bullet is greater than that given in the shooting tables. The difference between them increases with increasing distance, which is shooting. So, at a temperature of 35° C it reaches up to 10%. With a decrease in the temperature of charge and air than 15° C, the coordinate of the zero point of the trajectory of the motion of the bullet determined by the theoretical method will be less than the given in the shooting tables and the absolute value of the difference between them increases. Analyzing the values of the wind deflection of the bullet under the influence of the crosswind when the temperature of the air changed, we can state that the increase/decrease of the air temperature significantly increases/decreases the range of the flying ball, but the values of its wind deflection slightly differ from the values indicated in air temperature 15° C. The difference between the theoretical values of the wind deflection of the bullet and the given in the shooting tables is experimentally significant, if the firing is at a distance greater than 900 meters. However, the theoretical investigations allow to state that the values of wind deflection of the bullet, given in the shooting tables, for distances larger than 900 meters are questionable.

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Published

2019-05-28

How to Cite

Tkachuck, P. P., Velychko, L. D., & Horchynskyi, I. V. (2019). Influence of cartridge charge and air temperatures on the kinematic parameters of movement of the bullet released from the SVD. Military Technical Collection, (20), 42–47. https://doi.org/10.33577/2312-4458.20.2019.42-47

Issue

Section

DEVELOPMENT AND MODERNIZATION MILITARY EQUIPMENT

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