Original sentence: Powered by a 320-hp Rolls-Royce/Continental Tiara 6-320-2B piston engine.Proposed variant powered by a 550-hp Pratt & Whitney Canada PT-6A turboprop engine
Edited sentence: Powered by a 320-hp Continental/Rolls-Royce Tiara 6-320-2B piston engine.Proposed variant powered by a 550-hp Pratt & Whitney Canada PT6A turboprop engine