. ▁The ▁fore ▁and ▁a ft ▁g ond olas ▁each ▁hous ed ▁a ▁single ▁engine ▁driving ▁a ▁pair ▁of ▁sw iv elling ▁prop ell ors , ▁one ▁either ▁side , ▁while ▁the ▁centre ▁car ▁contained ▁two ▁engines ▁with ▁one ▁fixed ▁prop eller ▁each . ▁ ▁As ▁a ▁result ▁of ▁the ▁removal ▁of ▁the ▁external ▁ke el , ▁when ▁the ▁first ▁tri als ▁were ▁held ▁the ▁two ▁air ships ▁were ▁able ▁to ▁turn ▁more ▁quickly ▁than ▁their ▁prede cess ors ; ▁but ▁more ▁important ly ▁it ▁was ▁discovered ▁during ▁the ▁lift ▁and ▁trim ▁tests ▁that ▁the ▁dispos able ▁lift ▁was ▁more ▁than ▁ 8   tons . ▁This ▁was ▁significantly ▁better ▁than ▁any ▁previous ▁British ▁air ship , ▁and ▁allowed ▁a ▁greater ▁bomb ▁load ▁to ▁be ▁carried ▁as ▁well ▁as ▁more ▁fuel ▁for ▁increased ▁range . ▁ ▁Oper ational ▁history ▁ ▁R 2 7 ▁R 2 7 ▁was ▁constructed ▁by ▁William ▁Be ard more ▁and ▁Company ▁at ▁In ch inn an , ▁Ren f rew shire , ▁and ▁commission ed ▁on ▁ 2 9 ▁June ▁ 1 9 1 8 . ▁Under ▁the ▁command ▁of ▁Major ▁Om man ey ▁she ▁fle w ▁for ▁a ▁total ▁of ▁ 8 9 ▁hours ▁ 4 0 ▁minutes , ▁and ▁came ▁to ▁a ▁prem ature ▁end ▁while ▁at ▁R N AS ▁( Ro yal ▁Naval ▁Air ▁Service ) ▁How den ▁air ship ▁station ▁on ▁ 1 6 ▁August ▁that ▁year . ▁Sh aring ▁a ▁hang ar ▁with ▁R 2 7 ▁was ▁a ▁makes h ift ▁SS Z ▁class