Computer Sciences Corp. claims it has set a world speed flight record for large turbine helicopters over a recognized course with a Sikorsky Aircraft S-61 that it owns and operates for a U.S. Navy client. CSC personnel spent the last five months overhauling the S-61 and installing updated or new avionics, including a glass cockpit. CSC pilots Don Strother and Tom Algeo set course from Vancouver, B.C., on April 16, with a final destination of West Palm Beach, Fla. The company didn't say what the record time was. CSC said the record has been sanctioned and verified by the National Aeronautic Assn., the U.S. affiliate of the world authority for the validation of world aviation records, the Federation Aeronautique Internationale. The specific record category is large turbine helicopters, Class E Rotorcraft, Subclass E-1g.