Ukuphonsa i-javelin kuyingxenye eyinhloko yemicimbi yethrekhi neyenkundla, ngakho ukukhetha i-javelin efanele emiqhudelwaneni kubalulekile kubasubathi abafuna ukwenza kahle futhi bafinyelele imigomo yabo. Ingase ibukeke njengomkhonto, kodwa umkhonto wenziwa ngokunemba ngezinto ezithile, imiklamo yokubamba, nokulinganisela kwesisindo konke kucatshangelwa.
Akuwona wonke ama-javelin akhiwe ngendlela efanayo, yingakho kubalulekile ukuthi abasubathi bakhethe ehambisana nezinga labo lamakhono. Qhubeka ufunda ukuze ufunde kabanzi mayelana nendlela yokukhetha i-javelin efanele emiqhudelwaneni.
Okuqukethwe
Iyini i-javelin?
Inani lemakethe yomhlaba wonke lemishini yethrekhi neyenkundla
Kudume kangakanani ukuphonsa umkhonto?
Ukukhetha i-javelin efanele
Isiphetho
Iyini i-javelin?
Ngaphambi kokungena ezinhlotsheni ezihlukene zamajaveli emakethe, nalu ulwazi oluthile mayelana nokuthi iyini ngempela i-javelin.
I-javelin yinto efana nomkhonto esetshenziswa kumicimbi yengoma neyenkundla. Ngokuvamile yenziwa ngezinto ezifana ne-carbon fibre, i-fiberglass, noma insimbi futhi ilinganisa phakathi kwamamitha angu-2.2 no-2.7. Kukhona into yokubamba eduze nendawo ephakathi ye-javelin ngezinjongo zokulawula futhi.
Abasubathi bazokwethula i-javelin kude ngangokunokwenzeka endaweni ethile, ngenhloso yokufinyelela ibanga elide kunawo wonke kuyilapho begcina indlela efanele. Wonke ama-javelin alawulwa ngokucophelela yi-World Athletics ukuze kuqinisekiswe ukungenzeleli emiqhudelwaneni, ngakho kunemithetho okufanele ilandelwe ohlelweni lokukhiqiza.
Inani lemakethe yomhlaba wonke lemishini yethrekhi neyenkundla
Isidingo semishini yethrekhi nensimu sikhule kakhulu eminyakeni yamuva. Lokhu kuncike ezintweni ezimbalwa, njengokutholakala kalula kubathengi ngenxa yokuthengiswa kwe-e-commerce kanye nemicimbi yethrekhi neyenkundla evezwa njalo kuthelevishini. Imicimbi efana ne-javelin, i-discus, Futhi ukubeka zidinga okokusebenza okuncane uma kuqhathaniswa, kodwa zonke izinto zokusebenza zidinga ukuhlangabezana namazinga athile futhi zenziwe ngezinto ezisezingeni eliphezulu ukuze abasubathi benze kahle.
Ekupheleni kuka-2023, i- inani lemakethe yomhlaba wonke imishini yethrekhi nenkundla isifinyelele ku-USD 101 billion. Le nombolo kulindeleke ukuthi ikhule ngesilinganiso sokukhula sonyaka esiyinhlanganisela (CAGR) okungenani esingu-6.96% phakathi kuka-2024 no-2031. Lokho kuzoletha inani eliphelele lifinyelele cishe ku- I-USD 161.76 billion ngo-2031. Zonke izinhlobo zemishini yethrekhi neyenkundla zifakiwe kulokhu kuhlola, futhi i-javelin ihlelelwe ukudlala indima enkulu ekuthengisweni.
Kudume kangakanani ukuphonsa umkhonto?
I-Javelin iyingxenye eyinhloko yemicimbi yethrekhi neyenkundla, kodwa idume kangakanani? Ngokusho kwe-Google Ads, ubuciko be-"javelin" bunomthamo wokusesha wanyanga zonke we-246,000. Ukusesha okuningi kuza ngoMashi nokusesha okungu-368,000, noma u-13% wesamba sevolumu yosesho yonyaka. Kuso sonke isikhathi sonyaka, ukusesha kwe-“javelin” kuhlala kuqinile, kuhlala phakathi kuka-165,000 no-246,000 ngenyanga.
Umthamo wokusesha wesibili ophezulu uza ngoFebhuwari kanjalo nango-Okthoba nangoNovemba, lapho ukusesha kufinyelela ku-246,000 ngenyanga futhi kwenza u-27% wesamba sokusesha saminyaka yonke. Lokhu kukhombisa ukuthi ukuphonsa umkhonto kuwumdlalo odumile unyaka wonke, futhi imishini ye-javelin ihlale idingeka kakhulu. Ngo-2024, ukusesha kuphezulu ngenxa yama-Olympics ase-Paris, abukwa emhlabeni wonke futhi aletha izibukeli ezengeziwe ze-track and field kanye nalabo abangase babe abathengi bemishini yethrekhi nenkundla.
Ukukhetha i-javelin efanele
Umkhonto ungase ubukeke njengethuluzi elilula, kodwa kunezici ezimbalwa ezibalulekile okufanele zicatshangelwe. Lezi zici zidinga ukuvumelanisa nezinga lekhono elithile nendlela yokuphonsa yomuntu ngamunye, kanye nokuhlangabezana nezidingo eziqondene nokuncintisana.
Material
Omunye wabadlali abakhulu uma kuziwa ekusebenzeni ekujikijeleni i-javelin kuyinto ebonakalayo. Izinto ezahlukahlukene ezisetshenziswayo zingaba nomthelela omkhulu ekuqina, umuzwa, kanye nokusebenza kukonke. Noma yikuphi ukwaziswa okukhethiwe kufanele kubonise izinga lekhono lomuntu ngamunye kanye nemigomo yakhe yokuncintisana. Nazi izinto ezintathu ze-javelin ezisetshenzisiwe:
- Izikhonkwane ze-carbon fibre asetshenziswa abajikijeli abaphambili noma abangochwepheshe. Alula futhi avumelana nezimo, okuvumela ukulawula okukhulu. Abasebenzisi bazothola ukuthi bangakwazi ukufinyelela amabanga amade ngale nto futhi ngenxa yedizayini esebenza kahle kakhulu.
- Izikhonkwane ze-Fiberglass nikeza abajikijeli ibhalansi phakathi kwamandla nokuvumelana nezimo. Lokhu kusho ukuthi ziwusizo ezinhlobonhlobo zamazinga wamakhono njengoba zinikeza izici ezinhle zendiza.
- Izikhonkwane ze-Aluminium yizona ezithengeka kakhulu ngakho-ke zithandwa kakhulu phakathi kwabajikijeli abasaqalayo nabaphakathi. Ziyaziwa ngokuqina kwazo futhi, okubalulekile kwabaqalayo.
Ubude nesisindo
Izici ezimbili ezibalulekile zejaveli ubude nesisindo. Angaba nomthelela ngokuqondile ekundizeni nasekuphathweni komkhonto, futhi kufanele abe ngaphakathi kwemithetho yokuncintisana. Ubude nesisindo kungahluka kuye ngobulili kanye nezinga lokuncintisana.
Izimbangi zamazinga aphezulu, isibonelo, zizodinga a i-javelin engaba amagremu angama-800 futhi ilinganisa phakathi kwamamitha angu-2.6 no-2.7 emadodeni, futhi abesifazane, kufanele ibe nesisindo esingamagremu angu-600 futhi ihlale phakathi kwamamitha angu-2.2 no-2.3. Lokhu kuqinisekisa ukuthi kukhona ukungaguquguquki nokungenzeleli kuyo yonke imiqhudelwano.
Imikhonto esindayo idinga amandla engeziwe nezindlela, ngakho abajikijeli abasindayo bayadingeka. Ubude bungathinta ibhalansi kanye ne-aerodynamics ye-javelin. Uma i-javelin iyinde, abajikijeli bayothola ukuthi inokusimama okwengeziwe emoyeni. Abasubathi kufanele bakhethe i-javelin ehlangabezana nemithethonqubo futhi evumelana nezidingo zabo.
Gamba
I-javelin grip ingesinye isici esibalulekile abasubathi abazobe besibhekile. Kungathinta kakhulu ukulawula nokunethezeka komsubathi ngesikhathi sokujikijela. Izibambo ze-javelin ngokuvamile zenziwa ngezinto zokwenziwa noma intambo, zombili ezinikeza ukubamba okuvikelekile nokunethezekile. Itholakala eduze nendawo emaphakathi ye-javelin, futhi ukuthungwa kwayo nokuqina kungahluka phakathi kwamamodeli.
Ukubamba kufanele kuvumele abajikijeli ukuthi balondoloze ukuma kwesandla okungaguquki ngokuhamba kwesikhathi futhi bavumele amandla adingekayo ngaphandle kokushelela. Kubasubathi abathuthuke kakhulu, ukubamba okufanele usayizi wesandla sabo kuyisihluthulelo sokusebenza nokuvimbela ukulimala, okubabeka kusimo esingesihle.
Aerodynamics
Imikhonto angamathuluzi aklanywe ngokucophelela anama-aerodynamics engqondweni. Ukuma, izici ezingaphezulu, kanye nephoyinti lebhalansi konke kudlala indima ebalulekile ekusebenzeni kwemikhonto. Umkhonto owakheke kahle uzonqamula kalula emoyeni ngokuncipha ukumelana komoya, ngakho-ke ivumela umjikijeli ukuthi afinyelele ibanga elide. Ama-javelin adinga ukuwela phansi kuqala, ngakho-ke ukuqiniseka ukuthi ukusabalalisa isisindo kulungile nakho kubalulekile.
Iphoyinti lebhalansi
Isici esibalulekile esithonya indlela umkhonto oziphatha ngayo ibhalansi. Itholakala kancane ngaphambi kokubamba futhi inquma ukuthi i-javelin izwa kanjani esandleni nokuthi izinze kangakanani emoyeni.
Amaphoyinti ebhalansi ane-tip-heavy azondiza nge-trajectory ephansi futhi angaphonswa ngokuqhubekayo, kodwa ukufeza lokhu kudinga ukulawula nokunemba okwengeziwe. Ama-javelin anamaphoyinti ebhalansi asindayo umsila kulula ukuwalawula futhi afaneleka kakhulu kwabasaqalayo njengoba ehlinzeka ngendlela yendiza ezinzile ebheke lapho kuqondiwe khona. Abasubathi kumele bazinqumele ibhalansi efanele.
Isiphetho
Nakuba ama-javelin abukeka njengesiqephu esilula sethrekhi nensimu okufanele isetshenziswe, ziningi izinto abathengi abazozibheka. Izici ezifana nezinto, ubude nesisindo, ukubamba, i-aerodynamics, kanye nephoyinti lebhalansi konke kubaluleke ngokulinganayo uma kuziwa ekusebenzeni kukonke. Njengoba ithrekhi nenkundla ikhula kuphela ekudumeni, ama-javelin kulindeleke ukuthi akhule esidingo eminyakeni embalwa ezayo emhlabeni jikelele.
