INVESTIGATION OF THE INFLUENCE ON ADDITIONAL MOUNTED ON BARREL EDGE CONCENTRATED MASS OVER THE GROUPING OF GUNSHOT HITS IN SINGLE SHOOTING

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1 Iteratoal Coferece KNOWLEDGE-BASED ORGANIZATION Vol. XXI No 05 INVESTIGATION OF THE INFLUENCE ON ADDITIONAL MOUNTED ON BARREL EDGE CONCENTRATED MASS OVER THE GROUPING OF GUNSHOT HITS IN SINGLE SHOOTING Coyu Grgorov CONEV*, Krasmr Stoaov DAVIDOV** * Vasl Levsk Natoal Mltary Uversty, Shoome, Bulgara, ** Nkokola Vaptsarov Naval Academy, Vara, Bulgara, co9@abv.bg, kras_dav@abv.bg Abstract: Oe part of uversal tedeces that are coected wth armamet buldg ow s oretated to creatg ew models of small arms, that have creased battle effectveess. The groupg s oe of the most mportat techcal characterzatos that crease battle effectveess of small arms. I may cases, addg muzzle devces creases bullet dspersg. I order to avod ths, t s ecessary that the groupg these cases should be vestgated. Ths artcle presets a expermetal vestgato o the fluece of a addtoal mouted o barrel edge cocetrated mass over the groupg of gushot hts sgle shootg. Key words: small arms; groupg, muzzle devces, barrel edge, hts. Itroducto The last decade has chaged the vsos for the ma combats. Ths flueces the ut structures, tasks ad armamets. The most mportat thg ow s to have qualty stead of quatty. Oe part of the uversal tedeces, that are coected wth the armamet bult owadays, s oretated to creatg ew models of small arms, that have creased battle effectveess. The groupg s oe of the most mportat techcal characterzatos that crease battle effectveess of the small arms. I may cases, addg muzzle devces creases bullet dspersg. I order to avod ths, t s ecessary to vestgate the groupg these cases. The artcle shows a expermetal vestgato o the fluece of a addtoal mouted o barrel edge cocetrated mass over the groupg of gushot hts the sgle shootg.. Expermetal vestgato coductg The purpose of the vestgato s to dscover the mathematcal law that shows the groupg chagg at sgle shootg whe the addtoally mouted o barrel edge cocetrated mass has bee chaged. Ma tasks: - to coduct a expermetal shootg usg barrels wth addtoally mouted o them cocetrated mass wth values 0,05; 0,05; 0,075; 0,00; 0,5, 0,50; 0,75; 0,00; 0,5; 0,50; 0,75; 0,00; kg ad to measure the groupg of gushot hts the sgle shootg; - usg the receved results to dscover the mathematcal law that shows the groupg chagg at sgle shootg whe the addtoally mouted o barrel edge cocetrated mass has bee chaged. I order to acheve tasks, the followg restrctos are establshed: DOI: 0.55/kbo Ths work s lcesed uder the Creatve Commos Attrbuto-NoCommercal-NoDervatves.0 Lcese. 798 Uauthetcated Dowload Date 7/4/8 :9 AM

2 - order to suppress the other factors that fluece the groupg, ballstc barrels are used, mouted o a fxed base, located covered shootg gallery; - the bull s located at a stadard dstace for Republc Bulgara 00 m; - the fluece of addtoally mouted o the barrel cocetrated mass over the groupg s vestgated oly cases whe t s added to the muzzle. The research was coducted departmet Small Arms ad At-Ar Craft Armamet o Cetral Artllery Techcal Research Frg Groud Republc Bulgara [, ]. The research s based o Rules for testg of defese products Mstry of defese ad Bulgara Army. Orgazatos partcpats: NMU Vasl Levsk ad Cetral Artllery Techcal Research Frg Groud Republc Bulgara. Research object descrpto: two speed ballstc barrels that use cartrdges 7,6x9 model 4 year ad 7,6х54 model 908/0 year. Table Ballstc barrel data Ballstc barrel Ballstc barrels that used cartrdges 7,6х54 mm 7,6х54 mm model 908/0. Ballstc barrels that used cartrdges 7,6x9 model 4 year A Fgure : Ballstc barrels three-dmesoal model. A- Ballstc barrel that uses cartrdges 7,6x9 model 4 year wth addtoally mouted mass wth value 0,05 kg; B- Ballstc barrel that uses cartrdges 7,6х54 mm model 908/0 year wth addtoally mouted mass wth value 0, kg. Barrel mass [kg] B Barrel legth [m] Exteral dameter of barrel the fxg pot [m] 0,840 0,50 0,06, 0,50 0,06.. Research codtos - ambet temperature 0 o ± o ; - relatve humdty 65 ±5%; - the shootg was doe covered shootg gallery to elmate the wd fluece; - the cartrdges were the basc, ew, trouble-free ad produced the same year ad producer, order to reduce causes that fluece o tal bullets velocty; - the cartrdges were kept a room wth permaet temperature 4 hour before shootg; - dstace from the muzzle to the target 00 m; - barrel declato toward horzotal plae; - the barrel s cooled at every 0 shots. Used devces: - base for ballstc barrel; - ballstc barrel umbers; - cartrdges 7,6х5 model 908/0 year 70 umbers; - cartrdges 7,6х9 model 94 year - 70 umbers; 799 Uauthetcated Dowload Date 7/4/8 :9 AM

3 - mass wth values 0,05; 0,05; 0,075; 0,00; 0,5, 0,50; 0,75; 0,00; 0,5; 0,50; 0,75; 0,00 kg (legth - 0,05 m)... Expermetal vestgato order Ballstc barrel ad cartrdge preparato - ballstc barrel opeg cleag; - moutg the ballstc barrel o the base; - moutg the target the covered shootg gallery; - oretatg the ballstc barrel to target ad lockg the mechasms for oretatg. Fgure : Base for ballstc barrel. Fgure : Masses that were mouted o barrel edge wth values 0,05; 0,05; 0,075; 0,00; 0,5, 0,50; 0,75; 0,00; 0,5; 0,50; 0,75; 0,00 kg. R50/, R50/, R50/ value of radus that collect 50% of shots for frst, secod ad thrd seres [m]; umber of the sereses. F) Addg the mass wth value 0,05 kg o barrel muzzle; G) Steps from B tll E are repeated. H) The masses from 0,05 tll 0, kg are mouted cosecutvely ad steps from B tll E are repeated. I) Steps from A tll H are repeated for the secod barrel.. Expermetal vestgato results The results are preseted table ad fgure 4 Expermetal shootg A) Two shots for barrel heatg; B) Shootg group of twety shots at sgle fre. C) Measurg of the groupg (for value was take the radus that collect 50% of shots R50). D) Steps B ad C are repeated utl sereses are shot. E) Calculatg the groupg average values R50 AVR. (formula. ( R + R50 / + R50 / ) ( R50 AVR = 50 / where: R50 AVR average value of radus that collect 50% of shots [m]; 800 Uauthetcated Dowload Date 7/4/8 :9 AM

4 Mass value [kg] Ballstc barrel that uses cartrdges 7,6x9 model 4 year R 50 [m] Table Expermetal vestgato data Ballstc barrel that uses cartrdges 7,6х54 model 908/0 year R 50 [m]. 0 0,049 0,04. 0,05 0,045 0,04. 0,050 0,047 0, ,075 0,07 0, ,00 0,05 0, ,5 0,040 0, ,50 0,04 0, ,75 0,049 0, ,00 0,056 0, ,5 0,045 0,058. 0,50 0,06 0,06. 0,75 0,05 0,05. 0,00 0,05 0,060 The results table show that the chagg of the radus that collects 50% of shots (R 50 ) for the barrel that has less mass, but uses more powerful cartrdge s more tha,6 tmes. For the secod barrel the chagg s,6 tmes. Fgure 4: Drawg of the chagg of the radus that collects 50% of the shots. The drawg o fgure 4 s made usg the sple terpolato wth cubc sple (formula ). f = a + b.( ) + c.( ) + d.( ), x [ x0, x ]... S = f = a + b.( x x + c.( x x + d.( x x, x [ x, x ]... f = a + b.( x x + c.( x x + d.( x x, x [ x, x ] () 80 Uauthetcated Dowload Date 7/4/8 :9 AM

5 where: a = y ; y y h b =.( l + +. l ) = ; h 6 l c = ; l l d = + = -; 6. h Coeffcets l ad h ca be defed by the system (formula ). l = 0 y y y y0 h. l +.( h + h ). l + h. l = 6. h h... h. l l + = 0 +.( h + h ). l + h. l + y y = 6. h y y h () A B C Fgure 5: Chagg of groupg for barrel that uses cartrdges 7,6x9 model 4 year. A- Groupg whe mass wth value 0,5 kg s mouted; B- Groupg whe mass wth value 0,00 kg s mouted; C- Groupg whe mass wth value 0,00 kg s mouted. 4. Coclusos. Addtoally mouted cocetrated mass o barrel edge flueces over the groupg of gushot hts the sgle shootg. Ths fact ca be used order to receve better groupg whe the small arms are desged.. Lear creasg of the addtoally mouted cocetrated mass o barrel edge does ot lead to lear groupg chagg. The groupg chagg has drops ad pkes.. The curves for the two barrels are smlar, but t s possble to be oted that fluece of the addtoally mouted mass for the barrel that has less ow mass ad uses more powerful cartrdge s more strogly tha the other barrel. Refereces [] Правилник за изпитване на отбранителни продукти в Министерството на отбраната и българската армия, София, MO, 005 г. [] Правилник за управление на жизнения цикъл на отбранителните продукти, София, MO, Uauthetcated Dowload Date 7/4/8 :9 AM