Northrop Grumman Corp (NOC.N) has won a contract worth $93.08 million to build a full-scale demonstrator of a new unmanned spy plane – a flying wing with large counter-rotating propellers – that would take off and land on destroyers and frigates, the Pentagon said on Thursday. Northrop has been working on a design for the new drone for several years under a joint program called Tern that is led by the Defense Advanced Research Projects Agency and the U.S. Navy’s Office of Naval Research.