long overall, had a beam and an average draft of . Two Kampon geared turbines drove two shafts. They were powered by two Kampon water-tube boilers and produced a total of . They were rated at and had a range of at or at using the of fuel carried. The Chidori-class were exceedingly heavily armed for their size. The main battery consisted of three Type 3 guns mounted in a single-gun power-driven gun turret placed on the forecastle, ahead of the bridge, and a power-driven twin-gun turret aft. Sources are contradictory on her anti-aircraft armament, Whitley says that they had a single license-built Vickers 40 mm (2 pounder pom pom) and others credit them with a single machine gun. Two sets of twin torpedo launchers were mounted abaft the single funnel. In total these weapons represented 22.7% of the displacement. One Type 94 depth charge launcher was also carried. After the lead vessel Chidori was completed, it was discovered during trials that her center of gravity was too high and that she was overweight. To compensate, bulges fitted to the rest of the class. However, this proved to be insufficient. The Tomozuru Incident of March 12, 1934, resulted in an extensive redesign in which the Type 3 guns were replaced by smaller single 12 cm/45 3rd Year Type naval guns and one of the twin torpedo launchers was removed. An additional 100 tons of ballast also helped lower the center-of-gravity, but also meant the top speed was reduced to 28 knots. In 1944, the rear gun was removed and replaced with a twin-mount Type 96 25mm AA gun. Another twin-mount was located in front of the bridge and six single-mounts were added in various locations. The number of depth charges carried was also increased over the course of the war to 48. The Tomozuru Incident On 12 March 1934, shortly after completion, sailed in company with her sister and the light cruiser for night torpedo training. The weather worsened during the exercise and it was called off at 0325; the ships returning to port. Tomozuru never arrived and a search was launched. She was spotted at 1405 that same day, capsized and inverted, but still afloat. Thirteen of her 113-man crew were rescued. She was towed to Sasebo and docked, where she was rebuilt and returned to service. Consequences This disaster forced the Imperial Japanese Navy to review the stability