▁which ▁was ▁very ▁suitable ▁for ▁training , ▁but ▁of ▁limited ▁value ▁for ▁pat rol ▁work . ▁Lar ger ▁than ▁the ▁B - class , ▁these ▁bl im ps ▁had ▁two ▁mot ors ▁and ▁a ▁longer ▁end urance . ▁Once ▁again , ▁the ▁en velope ▁production ▁was ▁split ▁between ▁Go ody ear ▁and ▁Good rich , ▁with ▁control ▁cars ▁being ▁built ▁by ▁the ▁Burg ess ▁division ▁of ▁Curt iss ▁Aer op lane ▁and ▁Motor ▁Company . ▁Origin ally ▁the ▁Navy ▁ordered ▁ 3 0 ▁but ▁reduced ▁the ▁number ▁to ▁ 1 0 ▁after ▁the ▁arm ist ice ▁in ▁November ▁ 1 9 1 8 . ▁All ▁ten ▁of ▁the ▁" C " ▁type ▁air ships ▁were ▁delivered ▁in ▁late ▁ 1 9 1 8 , ▁and ▁examples ▁served ▁at ▁all ▁of ▁the ▁Navy ' s ▁air ship ▁stations ▁from ▁ 1 9 1 8 ▁to ▁ 1 9 2 2 . ▁In ▁ 1 9 2 1 ▁the ▁C - 7 ▁was ▁the ▁first ▁air ship ▁ever ▁to ▁be ▁infl ated ▁with ▁hel ium . ▁The ▁Navy ▁de comm ission ed ▁its ▁last ▁two ▁remaining ▁C - type ▁bl im ps , ▁the ▁C - 7 ▁and ▁ ▁C - 9 ▁in ▁ 1 9 2 2 . ▁ ▁Oper ations ▁Ar riv ing ▁too ▁late ▁for ▁the ▁war , ▁the ▁C - type ▁became ▁a ▁sort ▁of ▁experimental ▁air ship ▁and ▁was ▁used ▁for ▁a ▁variety ▁of ▁activities ▁besides ▁training . ▁C - 1 ▁was ▁the ▁first ▁air ship ▁to ▁release ▁an ▁air