▁Franklin ▁ 2 A - 1 2 0 - A ▁engine , ▁one ▁built . ▁T 6 1 C ▁Production ▁variant ▁fitted ▁with ▁a ▁Star ck ▁St amo ▁MS 1 5 0 0 ▁engine ▁with ▁an ▁electric ▁engine ▁start , ▁ 8 ▁built . ▁T 6 1 D ▁One ▁T 6 1 A ▁ref itted ▁with ▁Roll ason ▁R . S . 1 ▁engine ▁in ▁ 1 9 7 2 . ▁T 6 1 E ▁Production ▁aircraft ▁for ▁the ▁R AF ▁as ▁Vent ure ▁T 2 , ▁ 1 5 ▁built ▁later ▁modified ▁to ▁T 6 1 F . ▁T 6 1 F ▁Production ▁aircraft ▁for ▁the ▁R AF ▁with ▁electric ▁engine ▁st arter ▁as ▁the ▁Vent ure ▁T 2 , ▁ 1 5 ▁T 6 1 Es ▁modified ▁and ▁ 2 5 ▁built . ▁T 6 1 G ▁One ▁aircraft ▁power ed ▁by ▁a ▁Lim bach ▁SL 1 7 0 0 ▁engine . ▁Vent ure ▁T 1 ▁R AF ▁design ation ▁for ▁one ▁T 6 1 A ▁bought ▁for ▁evaluation ▁in ▁ 1 9 7 1 . ▁Vent ure ▁T 2 ▁R AF ▁design ation ▁for ▁production ▁T 6 1 E ▁and ▁later ▁T 6 1 F ▁aircraft . ▁ ▁Form er ▁Oper ators ▁ ▁Royal ▁Air ▁Force ▁ ▁Spec ifications ▁( T 6 1 A ) ▁ ▁See ▁also ▁ ▁References ▁ ▁Category : 1 9 7 0 s ▁British ▁civil ▁utility ▁aircraft ▁Category : 1 9 7 0 s ▁British ▁military ▁tra iner ▁aircraft ▁Category : M ot or ▁gl