▁preserved ▁as ▁a ▁museum ▁piece . ▁ ▁At ▁the ▁start ▁of ▁the ▁Second ▁World ▁War , ▁Bar nes ▁Wall is ▁proposed ▁a ▁" V ict ory ▁Bom ber " ▁of ▁ 5 0 ▁t onnes ▁to ▁carry ▁a ▁ 1 0 - ton ne ▁bomb ▁but ▁it ▁was ▁disc ount ed ▁by ▁the ▁Air ▁Ministry ▁because ▁of ▁its ▁limited ▁application . ▁As ▁the ▁war ▁progress ed ▁the ▁British ▁cont empl ated ▁very ▁large ▁bom ber ▁designs ▁( from ▁ 7 5 ▁to ▁ 1 0 0 ▁t onnes ▁with ▁bomb loads ▁of ▁ 2 5 ▁t onnes ▁and ▁six ▁or ▁more ▁engines ) ▁but ▁considered ▁the ▁time ▁required ▁to ▁bring ▁them ▁into ▁use , ▁the ▁difficulty ▁of ▁bal ancing ▁bomb load , ▁def ensive ▁arm ament ▁and ▁range , ▁and ▁the ▁success ▁of ▁existing ▁designs ▁( such ▁as ▁the ▁Av ro ▁Lanc aster ) ▁to ▁out we igh ▁any ▁advantages . ▁Some ▁of ▁the ▁work ▁on ▁large ▁aircraft ▁fed ▁into ▁the ▁post - war ▁Br istol ▁B rab azon ▁a ▁ 7 0 - m ▁wings pan ▁ 1 3 0 - ton ne ▁air lin er ▁which ▁would ▁have ▁given ▁its ▁ 1 0 0 ▁passengers ▁ship - like ▁levels ▁of ▁space ▁and ▁comfort . ▁ ▁With ▁the ▁arrival ▁of ▁the ▁jet ▁age , ▁air lin ers ▁continued ▁to ▁increase ▁in ▁size . ▁W ide - body ▁types ▁were ▁introduced ▁and , ▁in ▁ 1 9 7 0 , ▁the ▁Bo eing ▁ 7 4 7 ▁" J um bo ▁jet "