Menene saurin dawowa

Fastback wani nau'i ne na jikin mota tare da rufin da ke da gangara akai-akai daga gaban sashin fasinja zuwa bayan motar. Yayin da rufin ya matsa zuwa baya, yana zuwa kusa da gindin motar. A wutsiyar motar, saurin baya zai karkata kai tsaye zuwa ƙasa ko kuma ya karye ba zato ba tsammani. Ana amfani da ƙira sau da yawa saboda kyawawan halayen aerodynamic. Za a iya amfani da kalmar don kwatanta ƙira ko motar da aka kera ta wannan hanyar. 

Gangar bugun baya na iya zama mai lankwasa ko madaidaiciya, dangane da fifikon masana'antar. Hannun karkatar, duk da haka, ya bambanta daga abin hawa zuwa abin hawa. Yayinda wasu daga cikinsu suke da wata karamar kusurwa ta kusurwa, wasu kuma suna da bayyananniyar zuriya. Hannun karkatar da sauri baya tabbata, yana da sauƙi don ƙayyade rashi kinks. 

Duk da yake har yanzu ba a cimma matsaya a kan wanda ya fara amfani da jikin mota mai sauri ba, wasu sun ce Stout Scarab, da aka ƙaddamar a cikin 1930s, na iya kasancewa ɗayan motocin farko da suka yi amfani da wannan ƙirar. Hakanan ana ɗaukar karamar motar farko a duniya, Stout Scarab tana da rufin da ya faɗi a hankali sannan kuma a kaifi a bayansa, yayi kama da siffar hawaye.

Sauran masu kera motoci daga baya sun lura kuma suka fara amfani da irin wadannan zane-zanen kafin su gano madaidaiciyar karkatar da dalilan aerodynamic. 

Ofaya daga cikin fa'idodi na ƙirar sauri shine ƙarancin kayan aikin iska idan aka kwatanta da sauran tsarin jikin mota. Kamar yadda kowane abin hawa ke tafiya ta cikin matsalolin da ba a iya gani ba kamar guguwar iska, wani ƙarfin adawa da ake kira ja zai bunkasa yayin da abin hawa ke ƙaruwa. A wata ma'anar, motar da ke motsawa ta cikin iska ta gamu da juriya wanda ke rage saurin motar kuma yana daɗa fifiko ma'ana matsin lamba, saboda yadda iska ke zagaye abin hawa yayin da take gudana akanta. 

Motocin Fastback suna da rarar jan kafa mai yawa, wanda ke basu damar isa zuwa saurin gudu da tattalin arzikin mai tare da ƙarfi iri iri da mai kamar yawancin sauran motocin. Dragaramin jan coefficient ya sanya wannan ƙirar ta dace da wasanni da motocin tsere. 

Hatchbacks da fastbacks galibi suna rikicewa. Hatchback shine kalmar mota mai gilashin baya da ƙofar wutsiya, ko rufin rana, waɗanda ke manne da juna kuma suna aiki azaman naúrar. Yawancin lokaci akwai hinges a saman gilashin baya wanda ke ɗaga rufin rana da taga sama. Mutane da yawa, kodayake ba duka ba, masu sauri suna amfani da ƙirar hatchback. Mai sauri baya na iya zama hatchback kuma akasin haka.