quire ment ▁( G OR ) ▁for ▁a ▁new ▁transport ▁to ▁Bo eing , ▁Douglas , ▁Fair child , ▁Lock he ed , ▁Martin , ▁Ch ase ▁A ircraft , ▁North ▁American , ▁North rop , ▁and ▁Airl ifts ▁Inc . ▁ ▁The ▁new ▁transport ▁would ▁have ▁a ▁capacity ▁of ▁ 9 2 ▁passengers , ▁ 7 2 ▁combat ▁troops ▁or ▁ 6 4 ▁par atro op ers ▁in ▁a ▁cargo ▁compart ment ▁that ▁was ▁approximately ▁ ▁long , ▁ ▁high , ▁and ▁ ▁wide . ▁Un like ▁trans ports ▁derived ▁from ▁passenger ▁air lin ers , ▁it ▁was ▁to ▁be ▁designed ▁specifically ▁as ▁a ▁combat ▁transport ▁with ▁loading ▁from ▁a ▁h ing ed ▁loading ▁r amp ▁at ▁the ▁rear ▁of ▁the ▁fus el age . ▁A ▁key ▁feature ▁was ▁the ▁introduction ▁of ▁the ▁All ison ▁T 5 6 ▁tur b op rop ▁power plant , ▁which ▁was ▁developed ▁for ▁the ▁C - 1 3 0 . ▁The ▁tur b op rop ▁offered ▁greater ▁range ▁at ▁prop eller - dri ven ▁spe eds ▁compared ▁to ▁pure ▁tur bo jets , ▁which ▁were ▁faster ▁but ▁consum ed ▁more ▁fuel . ▁They ▁also ▁produced ▁much ▁more ▁power ▁for ▁their ▁weight ▁than ▁p ist on ▁engines . ▁ ▁Design ▁phase ▁The ▁Her cules ▁res emble d ▁a ▁larger ▁four - engine ▁brother ▁to ▁the ▁C - 1 2 3 ▁Pro vider ▁with ▁a ▁similar ▁wing ▁and ▁cargo ▁r amp ▁layout ▁that ▁evol ved ▁from ▁the ▁Ch ase ▁X CG - 2 0 ▁Av it ru c