Delphin was long, with a beam of and a draft of . She displaced at full load. The ship's crew consisted of 4 officers and 67 enlisted men. She was powered by a single marine steam engine that drove one 3-bladed screw propeller, with steam provided by two coal-fired trunk boilers, which gave her a top speed of at . As built, she was equipped with a three-masted schooner rig. The ship was armed with a battery of one rifled 24-pounder muzzle-loading gun and two rifled 12-pounder muzzle-loading guns.
