▁purchase ▁of ▁four ▁Haw ker ▁O sp rey ▁se ap lan es ▁for ▁the ▁Can arias - class ▁heavy ▁cru is ers ▁under ▁construction . ▁In ▁the ▁end ▁only ▁one ▁aircraft , ▁known ▁as ▁' Span ish ▁O sp rey ' ▁and ▁fitted ▁with ▁a ▁His p ano - Su iza ▁ 1 2 X br s ▁engine , ▁would ▁be ▁delivered . ▁ ▁In ▁ 1 9 3 2 ▁the ▁old ▁Av ro ▁ 5 0 4 K ▁train ers ▁were ▁replaced ▁by ▁the ▁more ▁modern ▁His p ano ▁A via ción ▁E - 3 0 . ▁Between ▁ 1 9 3 4 ▁and ▁ 1 9 3 5 ▁the ▁Republican ▁Navy ▁tried ▁to ▁modern ize ▁its ▁age ing ▁se ap lane ▁fleet ▁and ▁cont empl ated ▁replacing ▁the ▁D orn ier ▁Do ▁J ▁Wal ▁se ap lan es ▁with ▁ ▁B reg uet ▁ 5 2 1 ▁B izer te ▁and ▁the ▁Mac chi ▁M . 1 8 ▁with ▁P ote z ▁ 4 5 2 . ▁ ▁Until ▁ 1 9 3 6 ▁the ▁Aer on á ut ica ▁Naval ▁had ▁an ▁air ship ▁section ▁as ▁well . ▁In ▁ 1 9 3 4 , ▁when ▁the ▁Se ap lane ▁car rier ▁D éd alo ▁was ▁de comm ission ed ▁the ▁Aer on á ut ica ▁Naval ▁lost ▁most ▁of ▁its ▁officers , ▁who ▁were ▁transferred ▁to ▁other ▁branches ▁of ▁the ▁Spanish ▁Republican ▁Navy . ▁ ▁The ▁Inf anter ía ▁de ▁Marina ▁ ▁The ▁Spanish ▁Navy ▁Mar ines ▁( In