sentences:  The changes included relocating the engine nacelles to their final position above the wing, strengthening the wings to accommodate the engines, and redesigning the empennage to provide for twin-engine control requirements.The Federal Aviation Administration type certificate was approved on 7 March 1963.The Lancer's performance when flying on a single engine is notably poor; in a column for "AOPA Pilot", author Barry Schiff summarized the airplane's single-engine performance by writing that "...it doesn’t have any".