A 270 unpowered gliding turn followed by an additional 90 unpowered gliding turn in the opposite direction to realign the aircraft with the runway is then performed. A velocity of 1.3Vs (Clean) / cosφ with a 35° bank angle is recommended for the turn. Upon completion of the turn the aircraft is accelerated to the velocity for L=D max and continues to a landing. All transitions are assumed to occur instantaneously. Each of these recommendations, taken individually, is non-optimum. Collectively they result in failure of the aircraft to successfully complete the maneuver whenever the departure runway is less than 6000+ feet long. Because most aircraft of this type operate out of airports with run- ways considerably less than 6000 feet in length (typically 3000 feet in length), the maneuver recommended by Eckalbar will most likely result in an o airport landing.