Rubuta ci gaba don wannan sakin layi - Mark 3 yana da ƙarin ɓangaren tsakiya wanda ya ba shi tsawon da kuma motsawar tan 640. Ko da tare da wannan karin nauyin, jirgin ya kasance da sauri fiye da Mark 1. An karɓi Mk.3 a ranar 8 ga Afrilu 1941, kuma an riga an tsara shi a cikin sassa biyar. Alamar 4 ta ɗan gajarta kuma ta fi sauƙi fiye da Mk.3, amma tana da katako mai faɗi sosai () kuma an yi niyya ne don ayyukan ƙetare tashar sabanin amfani da teku. Lokacin da aka gwada a farkon hare-haren kai hari, kamar mummunan harin kwamandojin Kanada a kan Dieppe
a 1942, rashin iyawar motsa jiki ya haifar da fifiko ga gajeren tsawon lokaci a cikin nau'ikan gaba, mafi yawansu an gina su a Amurka.