The HMS Eagle was converted from a Chilean battleship to become a seaplane tender. The design was done by Sir E. H. Tennyson d'Eyncourt.
The hangar was two story tall. It was 400' long and 20' 6" high. There were two lifts, forward 47' x 46' and aft 33' x 46'.
An island on the flight deck was introduced for the first time with the HMS Eagle.
The Island went through several modifications before it was finalized on a long island with two funnels.