All Weather Lifeboat tasked at 1502 by UKCG to a 26ft Sail Yacht with fouled propeller and unable to make headway under sail. 2 persons on board, position between Darnettness Fort and Jetty, believed Oakhamness. ALB launched at 1520, locating yacht at 1535, tow line passed over and casualty craft safely under tow at 1543, proceeding upriver to Gillingham. The casualty was safely placed in the locks at Gillingham marina at 1615, ALB released and returned to station at 1645. SW 5.