cially ▁adapted . ▁Arm our ▁pl ating ▁and ▁even ▁def ensive ▁arm ament ▁were ▁removed ▁to ▁reduce ▁weight , ▁and ▁the ▁bomb - bay ▁doors ▁had ▁to ▁be ▁adapted . ▁ ▁At ▁the ▁same ▁time , ▁ 6 1 7 ▁" D amb ust ers " ▁Squadron ▁were ▁trained ▁in ▁the ▁use ▁of ▁a ▁special ▁bomb s ight , ▁the ▁St abil izing ▁Autom atic ▁Bomb ▁S ight ▁( S AB S ). ▁For ▁accuracy , ▁multiple ▁corre ctions ▁had ▁to ▁be ▁made ▁for ▁temperature , ▁wind ▁speed , ▁and ▁other ▁factors . ▁It ▁was ▁only ▁effective ▁if ▁the ▁target ▁could ▁be ▁identified , ▁and ▁several ▁miss ions ▁were ▁cancel led ▁or ▁un success ful ▁because ▁of ▁difficulty ▁in ▁accur ately ▁ident ifying ▁and ▁mark ing ▁the ▁targets . ▁ ▁For ▁use ▁on ▁under ground ▁targets , ▁the ▁bomb ▁was ▁fitted ▁with ▁three ▁separate ▁in ert ia ▁No . ▁ 5 8 ▁Mark ▁I ▁T ail ▁P ist ols ▁( f iring ▁mechan isms ). ▁These ▁triggered ▁det on ation ▁after ▁a ▁pre - set ▁delay , ▁which ▁gave ▁the ▁bomb ▁sufficient ▁time ▁to ▁pen et rate ▁the ▁target ▁before ▁expl oding . ▁Depending ▁on ▁mission ▁requirements , ▁the ▁time ▁delay ▁could ▁be ▁set ▁to ▁ 3 0 ▁seconds ▁or ▁ 3 0 ▁minutes ▁after ▁impact . ▁ ▁To ▁guarantee ▁det on ation , ▁three ▁Type ▁ 4 7 ▁long ▁delay ▁f uz es ▁were ▁fitted ▁inside ▁the ▁rear ▁of ▁the ▁bomb . ▁This ▁dram atically ▁improved ▁reli ability ▁of ▁the ▁weapon ;