Vospers of Great Britain arranged for several boatyards in the U.S. to build British-designed 70 ft Motor Torpedo Boats under license to help the war effort. 146 boats, armed with 18 in. torpedoes, were built for Lend Lease, and exported to Allied powers such as Canada, Britain, Norway, and the Soviet Union. These boats were never used by the U.S. Navy, and only about 50 were used by the Royal Navy; most were passed to other countries.