the "nagara"-class vessels were essentially identical to the previous "kuma"-class cruisers, retaining the same hull design, engines and main weaponry, with the addition of the new 610 mm type 93 long lance torpedoes, which required a larger launcher. however, in silhouette, a major difference from the "kuma" class was in the configuration of the bridge, which incorporated an aircraft hangar. initially, a platform was mounted above the no.2 turret, extending over the forward superstructure below the bridge. this was later replaced by an aircraft catapult. even so, the arrangement proved unwieldy, and the catapult was moved to the rear of each ship in the class, between the no.5 and no.6 turrets during retrofits in 1929-1934.