Raisbeck Engineering (Booth No. 2273), manufacturer of high-performance aftermarket modifications, announced here at the NBAA Convention certification of Raisbeck/Hartzell four-blade Quiet Turbofan Performance propellers for the King Air B200GT and C90GTi. The propellers are the heart of Raisbeck’s Epic Platinum and Epic Performance systems, yielding increased gross weight, improved takeoff, climb, cruise and landing performance.