This is the Brushless Motor Power Pack for the Multiplex Mentor and Magister Electric Trainer Airplanes. FEATURES: Everything needed to add brushless power to Multiplex trainers INCLUDES: Himax HC3528-1000 Brushless Motor #33 2326 Propeller Adapter Motor Mount, Mounting Ring, Standoffs and hardware BL-55 BPM Electronic Speed Control APC 11 x 5.5E Propeller, APCQ1055 Motor and ESC instruction sheets REQUIRES: Installing all components into airplane SPECS: Motor; Max Power: 450W approximate Max RPM: 20,000 Diameter: 1.39" (35.2mm) Length: 2.13" (54.2mm) Shaft Diameter: .1969" (5.0mm) Mount Screw Thread: 4-40, max depth, 5mm on 25mm (1") circle Maximum Case Temperature: 149??F (65??C) MultiplexPart MPUM993228