Hartzell Propeller Inc's Lightweight Turbine series four-bladed propeller has been selected for installation on the Piper Malibu Meridian, and has successfully completed flight testing for certification. The propeller selected is 82.5 inches in diameter and features feathering and reversing capability. Hartzell reports that flight tests demonstrated an extra three knots in cruise performance over the previously selected three bladed propeller. \r"During the Meridian development programme," explained a spokesperson for Hartzell, "Piper found it could increase the power ratings of its Pratt and Whitney Canada PT6A-42A engine. Take-off power was increased from 350 shp to 400 shp. These increases called for additional propeller blade area to efficiently convert the added power into thrust. Since the aircraft design limited the blade diameter, adding a blade was the most effective solution.\r"Not only did this new design enhance cruise speed, it also significantly improved low end thrust resulting in reduced take-off distance and an increased rate of climb. Interior noise and vibration levels will also benefit from the change."