<prompt> Ferrari 643 yaiva motokari yeFormula One yakagadzirwa naSteve Nichols naJean-Claude Migeot uye yakavakwa naScuderia Ferrari kuti ishandiswe mumwaka we 1991 Formula One. Yakagadzirwa muna May uye yakatangwa paFrench Grand Prix  <response>: kwokutanga kwakaratidzika kuva kungagona kumhanya pamberi. Alain Prost akakwanisa mumutsara wokutanga uye akatungamirira, uye kunyange zvazvo akazopedzisira apfuurwa naNigel Mansell muRenault powered Williams FW14 yake, nzvimbo yechipiri mumutambo wokutanga wemotokari yacho yakaratidza kuvimbisa. Kunze kwokuva nguva dzose pamberi pechikwata, zvisinei, kwakanga kusingafaniri kudaro. 