Rocket

**roket** (daga Italiyanci: , lit. "bobbin / spool", kuma an sa mai suna saboda siffarsa)   abin hawa ne wanda ke amfani da jet propulsion don hanzari  ba tare da amfani da iska ba. Injin roket yana samar da turawa ta hanyar amsawa ga fitarwa da aka fitar da sauri. Injinan roket suna aiki gaba ɗaya daga man fetur da aka ɗauka a cikin abin hawa; saboda haka roket na iya tashi a cikin sararin samaniya. Rockets suna aiki da kyau a cikin iska kuma suna haifar da asarar turawa saboda matsin lamba na yanayi.

Rockets na Multistage suna iya samun saurin tserewa daga Duniya sabili da haka zasu iya cimma matsakaicin tsawo mara iyaka. Idan aka kwatanta da injunan numfashi, rokoki suna da nauyi kuma suna da iko kuma suna iya samar da babban hanzari. Don sarrafa jirgin su, rokoki sun dogara da ƙarfin, iska, injunan taimako, motsa jiki, ƙafafun motsi jiki, karkatar da kwararar fitarwa, kwararar man fetur, juyawa, ko nauyi.

Rockets don amfani da soja da nishaɗi sun samo asali ne daga akalla karni na 13 na kasar Sin. Muhimmin amfani da kimiyya, interplanetary da masana'antu bai faru ba har zuwa karni na 20, lokacin da roketry shine fasahar da ke ba da damar Space Age, gami da sanya ƙafa a kan wata. Ana amfani da rokoki yanzu don wasan wuta, makamai masu linzami da sauran makamai, kujerun fitarwa, motocin kaddamarwa da tauraron dan adam na wucin gadi, Jirgin sararin samaniya na mutum, da Binciken sararin samaniya.

Rockets na sinadarai sune mafi yawan nau'ikan rokoki masu ƙarfi, yawanci suna haifar da fitarwa mai sauri ta hanyar konewa man fetur tare da oxidizer. Abun da aka adana na iya zama iskar gas mai sauƙi ko man fetur guda ɗaya wanda ke rarraba a gaban mai haɓaka (mai ƙarfi), ruwa biyu da ke amsawa da sauri akan tuntuɓar (mai amfani da hypergolic), ruwa biyu waɗanda dole ne a kunna su don amsawa (kamar kerosene (RP1) da ruwa oxygen, wanda aka yi amfani da shi a mafi yawan rokoki na ruwa-mai ƙarfi), haɗuwa mai ƙarfi tare da oxidizer (mai ƙarfi mai ƙarfi), ko mai ƙarfi tare na ruwa ko oxidizer mai ƙarfi (tsarin mai haɗuwa mai haɗuwa da gas). Rockets na sinadarai suna adana makamashi mai yawa a cikin sauƙin saki, kuma suna iya zama haɗari sosai. Koyaya, ƙira mai kyau, gwaji, gini da amfani yana rage haɗari. 

## Tarihi

A kasar Sin, roket masu amfani da foda sun samo asali ne a tsakiyar kasar Sin a zamanin daular Song a karni na 13. Sun kuma ƙera wani farkon nau'i na harba roka da yawa a wannan lokacin. Mongols sun yi amfani da fasahar roka ta kasar Sin, kuma abin da aka kirkira ya bazu ta hanyar mamayar Mongol zuwa Gabas ta Tsakiya da Turai a tsakiyar karni na 13. A cewar Joseph Needham, sojojin ruwa na Song sun yi amfani da rokoki a wani atisayen soji da aka yi kwanan watan 1245. An ambaci roka na konewa na cikin gida a cikin wani bayani game da 1264, yana yin rikodin cewa "bera-ƙasa", nau'in wasan wuta, ya tsoratar da Empress-Mahaifiyar Gongsheng a wani bikin da aka yi don girmama ta da ɗanta  Sarkin sarakuna Lizong. Bayan haka, an shigar da rokoki a cikin littafin soja na Huolongjing, wanda kuma aka fi sani da Littafin Wuta Drake, wanda jami'in bindigu na kasar Sin Jiao Yu ya rubuta a tsakiyar karni na 14. Wannan rubutun ya ambaci roka na farko da aka sani da yawa, wato 'mazarin wuta da ke fitowa daga ruwa' (Huo long chu shui), wanda ake zaton sojojin ruwan kasar Sin ne suka yi amfani da shi.

An yi amfani da rokoki na zamanin da da na zamani ta hanyar soji a matsayin makamai masu tayar da hankali a kewaye. A tsakanin shekara ta 1270 zuwa 1280, Hasan al-Rammah ya rubuta al-furusiyyah wa al-manasib al-harbiyya (Littafin Dokin Soja da Na'urorin Yaki), wanda ya hada da girke-girke na foda 107, 22 daga cikinsu na rokoki. A Turai, Roger Bacon ya ambaci bindigogin wuta da aka yi a sassa daban-daban na duniya a cikin Opus Majus na 1267. Tsakanin 1280 zuwa 1300, Liber Ignium ya ba da umarnin yin na'urori masu kama da wuta bisa asusun hannu na biyu. Konrad Kyeser ya bayyana rokoki a cikin littafinsa na soja na Bellifortis a kusa da 1405. Giovanni Fontana, injiniyan Paduan a cikin 1420, ya ƙirƙiri adadi na dabbar roka.

Sunan "rocket" ya fito ne daga rocchetta na Italiyanci, ma'ana "bobbin" ko "karamin spindle", wanda aka ba da shi saboda kamanni da siffar bobbin ko spool da ake amfani da shi don riƙe zaren daga motsin juyawa. Leonhard Fronsperger da Conrad Haas sun karɓi kalmar Italiyanci zuwa Jamusanci a tsakiyar karni na 16; "roka" ya bayyana a cikin Turanci a farkon karni na 17. Artis Magnae Artilleriae pars prima, muhimmin aikin zamani na farko kan makaman roka, na Casimir Siemienowicz, an fara buga shi a Amsterdam a shekara ta 1650.

Roka na Mysorean su ne rokoki na farko da suka yi nasara a cikin rokoki na ƙarfe, waɗanda aka haɓaka a ƙarshen ƙarni na 18 a cikin Masarautar Mysore (ɓangare na Indiya ta yau) ƙarƙashin mulkin Hyder Ali. 

Makamin Congreve wani makamin Biritaniya ne wanda Sir William Congreve ya kera kuma ya kera shi a shekara ta 1804. Wannan roka an gina shi ne kai tsaye kan rokoki na Mysorean, an yi amfani da foda da aka matsa kuma an yi amfani da shi a yakin Napoleonic. Wannan roka ne na Congreve wanda Francis Scott Key ke magana a kai, lokacin da ya rubuta game da "jajayen hasken roka" a lokacin da ake tsare da shi a kan wani jirgin ruwa na Burtaniya da ke kewaye da Fort McHenry a 1814. Tare, sabbin abubuwan Mysorean da na Biritaniya sun haɓaka tasirin rokoki na soja daga yadi 100 zuwa 2,000 (91 zuwa 1,829 m).

Magani na farko na ilimin lissafi na ƙarfin roka ya samo asali ne saboda William Moore (1813). A cikin 1814, Congreve ya buga littafi wanda a cikinsa ya tattauna amfani da na'urorin harba roka da yawa. A cikin 1815 Alexander Dmitrievich Zasyadko ya gina dandamali na harba roka, wanda ya ba da damar harba rokoki a cikin salvos (roka 6 a lokaci guda), da na'urori masu harbi. William Hale a cikin 1844 ya ƙara haɓaka daidaiton makaman roka. Edward Mounier Boxer ya kara inganta roka na Congreve a 1865.

William Leitch ya fara ba da shawarar yin amfani da roka don ba da damar zirga-zirgar jiragen sama na ɗan adam a cikin 1861. An fara ba da bayanin bayanin jirgin Leitch a cikin maƙalarsa ta “A Journey through Space” a shekara ta 1861, wanda daga baya aka buga a cikin littafinsa ɗaukakar Allah a cikin sama (1862). Konstantin Tsiolkovsky daga baya (a cikin 1903) shi ma ya yi tunanin wannan ra'ayi, kuma ya ɓullo da wani tsarin ka'idar da ya samar da tushen ci gaban jirgin sama.

The British Royal Flying Corps ya tsara roka mai jagora a lokacin yakin duniya na 1. Archibald Low ya bayyana "...a cikin 1917 Ayyukan Gwaji sun tsara roka mai sarrafa wutar lantarki ... An gudanar da gwaje-gwajen roka a ƙarƙashin ikon kaina tare da taimakon Cdr Brock." Harba da sarrafa jagora na iya zama ko dai waya ko mara waya. Rikicin roka da jagora ya fito daga saniyar da ke karkata a hanci.

A cikin 1920, Farfesa Robert Goddard na Jami'ar Clark ya buga yunƙurin inganta fasahar roka a cikin *A Method of Reaching Extreme Altitude*.[19] A cikin 1923, Hermann Oberth (1894-1989) ya buga Die Rakete zu den Planetenräumen (The Rocket into Planetary Space). Roka na zamani sun samo asali ne a cikin 1926 lokacin da Goddard ya haɗa bututun ƙarfe na supersonic (de Laval) zuwa babban ɗakin konewa. Wadannan nozzles suna juya gas mai zafi daga ɗakin konewa zuwa mai sanyaya, hypersonic, jet na iskar gas sosai, fiye da ninka turawa da haɓaka ingancin injin daga 2% zuwa 64%. Amfanin da ya yi da masu sarrafa ruwa a maimakon foda ya rage nauyi sosai kuma ya kara tasirin rokoki.

A cikin 1921, dakin gwaje-gwajen bincike da ci gaba na Soviet Gas Dynamics Laboratory ya fara haɓaka rokoki masu ƙarfi, wanda ya haifar da harba na farko a cikin 1928, wanda ya tashi kusan mita 1,300. An yi amfani da waɗannan rokoki a cikin 1931 don nasarar farko da aka yi amfani da rokoki a duniya don yin amfani da roka don tada jirgin sama,  kuma sun zama samfuran harba roka na Katyusha,  waɗanda aka yi amfani da su a lokacin Yaƙin Duniya na II.

A cikin 1929, an fito da fim ɗin almara na kimiyyar Jamus na Fritz Lang *Woman in the Moon*. Ya baje kolin amfani da roka mai matakai da yawa, sannan kuma ya fara aiwatar da manufar harba roka (rokatin da ke tsaye a kan wani dogon gini kafin a harba shi a hankali a hankali) da agogon kirga roka.  Mai sukar fim din *The Guardian* Stephen Armstrong ya ce Lang "ya kirkiro masana'antar roka". Lang ya samu wahayi ne daga littafin 1923 The Rocket into Interplanetary na Hermann Oberth, wanda ya zama mashawarcin kimiyyar fim din kuma daga baya wani muhimmin jigo a cikin tawagar da suka kirkiri rokar V-2. An yi imanin cewa fim ɗin yana da haƙiƙa sosai ta yadda Nazis suka hana shi lokacin da suka hau kan karagar mulki don tsoron kada ya tona asirin rokoki na V-2.

A cikin 1943 an fara samar da rokar V-2 a Jamus. Cibiyar Nazarin Sojoji ta Peenemünde ce ta tsara shi tare da Wernher von Braun wanda ke aiki a matsayin darektan fasaha. V-2 ya zama abu na farko da ya fara tafiya zuwa sararin samaniya ta hanyar ketare layin Kármán tare da ƙaddamar da MW 18014 a tsaye a ranar 20 ga Yuni 1944. Doug Millard, masanin tarihin sararin samaniya kuma mai kula da fasahar sararin samaniya a gidan kayan tarihi na Kimiyya, London, inda aka baje kolin V-2 a cikin babban zauren nunin, ya ce: "V-2 ya kasance tsalle-tsalle na canjin fasaha. Mun isa duniyar wata ta amfani da fasahar V-2 amma wannan fasaha ce da aka ɓullo da manyan albarkatu, ciki har da wasu musamman m na Nazi. A V-2 da kuma tsada a cikin sharuddan aiki da aka yi amfani da rayuwar bayi. roka." A cikin layi daya da shirin makami mai linzami na Jamus, an kuma yi amfani da rokoki a kan jiragen sama, ko dai don taimakawa a kwance (RATO), tashi tsaye (Bachem Ba 349 "Natter") ko kuma don ƙarfafa su (Ni 163, duba jerin makamai masu linzami na Jamus ja-goranci na Yaƙin Duniya na II). Shirye-shiryen roka na Allies ba su da fasaha, yawanci sun dogara da makamai masu linzami marasa jagora kamar roka na Soviet Katyusha a cikin aikin manyan bindigogi, da kuma bazuka na bazuka na Amurka. Waɗannan sun yi amfani da ƙaƙƙarfan abubuwan motsa jiki.

## Nau'uka
#### Tsarin motoci

Ana yawan kera motocin roka a cikin siffar “roka” doguwar sirara ta archetypal wacce ke tashi a tsaye, amma a zahiri akwai nau’ikan rokoki iri-iri da suka hada da:

*ƙananan samfura kamar roka na balloon, roka na ruwa, sama ko ƙananan rokoki masu ƙarfi waɗanda za'a iya siye a kantin sha'awa.
*Makamai masu linzami
*roka sararin samaniya kamar babban Saturn V da aka yi amfani da shi don shirin Apollo
*Motocin roka
*keken roka
*Jirgin sama mai amfani da roka (ciki har da taimakon roka daga jirgin sama na al'ada - RATO)
*fakitin jet masu ƙarfin roka
*tsarin tserewa da sauri kamar kujerun fitarwa da tsarin tserewa 
*binciken sararin samaniya

## Zane

Zane na roka zai iya zama mai sauƙi kamar bututun kwali mai cike da baƙar foda, amma yin ingantaccen roka ko makami mai linzami ya haɗa da shawo kan matsaloli masu wuyar gaske. Babban matsalolin sun haɗa da sanyaya ɗakin konewa, zubar da mai (a cikin yanayin man fetur), da sarrafawa da gyara hanyar motsi.

### Kayan wucin gadi

Rokatoci sun ƙunshi abin tuƙi, wurin da za a saka abin turawa (kamar tanki mai faɗakarwa), da bututun ƙarfe. Hakanan suna iya samun injunan roka ɗaya ko sama da haka, na'urar tabbatar da kai tsaye (kamar fins, injunan vernier ko gimbals na injin don matsawa vectoring, gyroscopes) da tsari (yawanci monocoque) don riƙe waɗannan abubuwan tare. Roka da aka yi niyya don amfani da yanayi mai saurin gudu suma suna da fa'ida ta iska kamar mazugi na hanci, wanda yawanci ke ɗaukar nauyin kaya.

### Injuna

Injin roka suna amfani da ka'idar tukin jirgin sama. Injin roka masu sarrafa rokoki sun zo a nau'ika  daban-daban; Ana iya samun cikakken jerin a cikin babban labarin, injin Roket. Yawancin rokoki na yanzu roka ne da ake amfani da su ta hanyar sinadarai (yawanci injunan konewa na ciki, amma wasu suna amfani da na'ura mai lalatawa) wanda ke fitar da iskar gas mai zafi. Injin roka na iya yin amfani da masu sarrafa iskar gas, ƙwaƙƙwaran fantsama, mai sarrafa ruwa, ko gauraya gauraye na duka mai ƙarfi da ruwa. Wasu rokoki suna amfani da zafi ko matsa lamba da ake bayarwa daga wani tushe ban da halayen sinadaran da ke haifar da abu ko abubuwa, kamar roka mai tururi, roka masu zafin rana, injin roka masu zafi na nukiliya ko roka masu sauƙi kamar roka na ruwa ko masu tura gas mai sanyi.

### Farfela

Tushen roka wani taro ne wanda aka adana shi, yawanci a wani nau'i na tanki ko casing, kafin a yi amfani da shi azaman abin motsa jiki wanda ake fitarwa daga injin roka a cikin nau'in jet mai ruwa don samar da turawa[3]. Ga roka masu sinadari sau da yawa masu turawa man fetur ne kamar ruwa hydrogen ko kananzir da aka ƙone tare da oxidizer kamar ruwa oxygen ko nitric acid don samar da babban juzu'in gas mai zafi sosai. Oxidiser ko dai an ware shi kuma a gauraye shi a cikin ɗakin konewa, ko kuma ya zo a haɗa shi, kamar tare da rokoki masu ƙarfi.

### Pendulum rocket fallacy

Rikicin mai na farko wanda Robert H. Goddard ya gina ya sha bamban da rokoki na zamani. Injin roka ya kasance a sama da tankin mai a kasan rokar, bisa ga imanin Goddard cewa rokar za ta samu kwanciyar hankali ta hanyar “retaye” daga injin kamar pendulum a cikin jirgin.  Duk da haka, rokar ya kauce daga hanya kuma ya fado a nisan ƙafa 184 (mita 56) daga wurin da aka harba, wanda ke nuni da cewa rokar ɗin ba ta da kwanciyar hankali fiye da ɗaya da injin roka a gindin.

## Amfani
Dole ne a yi amfani da roka ko wasu na'urori makamantan masu ɗauke da nasu na'ura lokacin da babu wani abu (ƙasa, ruwa, ko iska) ko ƙarfi (na nauyi, maganadisu, haske) wanda abin hawa zai iya amfani da shi da amfani don motsawa, kamar a sararin samaniya. A cikin waɗannan yanayi, wajibi ne a ɗauki duk abin da za a yi amfani da shi. 

Duk da haka, suna da amfani a wasu yanayi:

### Aikin soja

Wasu makaman soji na amfani da rokoki wajen kai hare-haren da aka kai musu. Ana kiran roka da nauyinsa tare a matsayin makami mai linzami lokacin da makamin yana da tsarin jagora (ba dukkan makamai masu linzami ne ke amfani da injin roka ba, wasu suna amfani da wasu injina irin su jet) ko kuma a matsayin roka idan ba shi da shiriya. Makamai masu linzami da makami mai linzami da makami mai linzami suna amfani da injunan roka wajen kai hare-hare cikin sauri cikin nisan mil da yawa, yayin da za a iya amfani da makamai masu linzami da ke tsakanin nahiyoyi domin isar da manyan makaman kare dangi daga dubban miliyoyi, kuma makami mai linzami da ke kokarin dakile su. An kuma yi gwajin makaman roka don leken asiri, kamar roka na Ping-Pong, wanda aka harba don sa ido kan harin abokan gaba, duk da haka, makaman roka ba su taba yin amfani da su sosai a cikin sojoji ba.

### Kimiyya da Bincike

Ana amfani da rokoki masu sauti da yawa don ɗaukar kayan aikin da ke ɗaukar karatu daga kilomita 50 (31 mi) zuwa kilomita 1,500 (930 mi) sama da saman duniya. Hotunan farko na duniya daga sararin samaniya an samo su ne daga roka na V-2 a cikin 1946 (jirgi #13).

Ana kuma amfani da injunan roka don tayar da roka a kan titin dogo cikin tsananin gudu. Rikodin duniya na wannan shine Mach 8.5.

### Jirgin sama

Ana harba manyan rokoki yawanci daga kushin harbawa wanda ke ba da ingantaccen tallafi har zuwa ƴan daƙiƙa kaɗan bayan kunnawa. Saboda tsananin gudu na shaye-shaye-2,500 zuwa 4,500 m/s (9,000 zuwa 16,200 km/h; 5,600 to 10,100 mph) — roka suna da amfani musamman idan ana buqatar saurin gudu sosai, kamar saurin orbital a kusan 7,800 m/h (28,000m/h). Jiragen sama da aka isar da su cikin hanyoyin sararin samaniya sun zama tauraron ɗan adam na wucin gadi, waɗanda ake amfani da su don dalilai na kasuwanci da yawa. Lallai rokoki sun kasance hanya daya tilo ta harba jiragen sama zuwa sararin samaniya da kuma bayanta. Ana kuma amfani da su don hanzarta hanzarin jiragen sama a lokacin da suka canza kewayawa ko de-orbit don saukowa. Har ila yau, ana iya amfani da roka don sassauta saukar parachute mai wuya nan da nan kafin a taɓa (duba retrorocket).

### Ceto

An yi amfani da rokoki wajen tura layi zuwa wani jirgin ruwa da ya rutsa da shi domin a yi amfani da bulo mai kirar Breeches don ceto wadanda ke cikin jirgin. Ana kuma amfani da rokoki don harba gobarar gaggawa.

Wasu rokoki da aka harba, musamman Saturn V da Soyuz, suna da tsarin tserewa. Wannan ƙaramar roka ce, yawanci roka mai ƙarfi wacce ke da ikon cire capsule ɗin da aka haɗe daga babban abin hawa zuwa aminci a ɗan lokaci. An yi amfani da waɗannan nau'ikan tsarin sau da yawa, duka a gwaji da kuma a cikin jirgin, kuma ana sarrafa su daidai kowane lokaci.

Wannan shi ne yanayin lokacin da Tsarin Tabbatar da Tsaro (Soviet nomenclature) ya yi nasarar cire capsule na L3 a yayin harba roka uku daga cikin hudu da ba su yi nasara ba na rokar Soviet Moon, motocin N1 3L, 5L da 7L. A cikin dukkan lokuta ukun capsule, ko da yake ba a haɗa shi ba, ya sami ceto daga lalacewa. Roka N1 guda uku da aka ambata kawai suna da Tsarukan Tabbatar da Tsaro na aiki. Fitaccen abin hawa, 6L, yana da manyan matakai na sama don haka babu tsarin tserewa wanda ke ba N1 mai haɓaka ƙimar nasara 100% don fitowa daga ƙaddamarwar da ta gaza.

Nasarar tserewa daga wani kapsul ɗin da aka yi amfani da shi ya faru lokacin da Soyuz T-10, a kan wata manufa ta zuwa tashar sararin samaniya ta Salyut 7, ya fashe a kan kushin.

Ana amfani da kujerun korar roka masu ƙarfi a cikin jiragen sama na soja da yawa don korar ma'aikatan zuwa tsaro daga abin hawa lokacin da aka rasa kulawar jirgin.

### Abin sha'awa, wasanni da nishaɗi

Roka samfurin ƙaramin roka ne da aka ƙera don isa ƙananan tsaunuka (misali, 100-500 m (330-1,640 ft) don ƙirar 30 g (1.1 oz)) kuma za a sake dawo da su ta hanyoyi daban-daban.

A cewar Ƙungiyar Rocketry ta Amirka (NAR),  roka an yi su ne da takarda, itace, robobi da sauran kayan marasa nauyi. Lambar kuma tana ba da jagororin amfani da mota, zaɓin wurin ƙaddamarwa, hanyoyin ƙaddamarwa, ƙaddamar da ƙaddamarwa, ƙirar tsarin farfadowa da turawa da ƙari. Tun farkon shekarun 1960, an samar da kwafin Model Roket Safety Code tare da mafi yawan na'urorin roka da injina. Duk da alaƙar da ke tattare da shi tare da abubuwa masu ƙonewa da abubuwa masu nuni da ke tafiya cikin sauri, ƙirar rocketry a tarihi ya tabbatar  ya zama abin sha'awa mai aminci kuma an lasafta shi a matsayin babban tushen wahayi ga yara waɗanda a ƙarshe suka zama masana kimiyya da injiniyoyi.

Ana amfani da rokoki na hydrogen peroxide don kunna fakitin jet,  kuma an yi amfani da su don kunna motoci kuma motar roka tana ɗaukar rikodin tsere na kowane lokaci (duk da cewa ba na hukuma ba).

Corpulent Stump shine roka mafi ƙarfi  ba na kasuwanci ba wanda aka taɓa harba akan injin Aerotech a cikin Burtaniya.

## Manazarta