The Project 664 (NATO reporting name Wisla) class were Polish torpedo boats, designed in Poland in the 1970s.

In order to test the technology, a single experimental project 663D torpedo boat was built, ORP Błyskawiczny.

They shared a similar silhouette, hull shape and a propulsion fit of 4 diesel and a TM-1 gas turbine engine in a CODAG arrangement.

First of all, the hulls, made of hydronalium (aluminium alloy), had limited durability, especially when sailing at high speed on a rough sea, resulting in cracks.

Propulsion was also not optimal, the gas turbine was not fuel efficient limiting range, and there were problems with the gearing of paired engines.