text: Some torpedoes, such as the Russian VA-111 Shkval, the Iranian Hoot or the proposed German Unterwasserlaufkörper / Barracuda , use supercavitation to increase their speed to over 200 knots (370 km/h); compare the speed of the Mark 46 torpedo, which does not use supercavitation, of about 28 knots (32 mi/h, 52 km/h).