The turbines were rated at a total of 52,000 shaft horsepower (39,000 kW) for a designed speed of 35 knots (65 km/h; 40 mph).

[2] The guns were able to elevate up to 75° to increase their ability against aircraft, but their slow rate of fire, slow traversing speed, and the lack of any sort of high-angle fire-control system meant that they were virtually useless as anti-aircraft guns.

[2] On the night of 24–25 November 1943, Ōnami led a troop transport/evacuation run to Buka Island.

Ōnami blew up and sank with all hands, including ComDesDiv 31 (Captain Kiyoto Kagawa).

[5] Captain Kiyoto Kagawa was posthumously promoted two ranks, one of the few IJN destroyer skippers so honored.