This is the .40 Brushless Electric Motor from O.S. Motors.            
                                                                               
    #OS51013000    
                                                                              
FEATURES: For airplanes using a .40 - .50 size 2-stroke engine or 4-stroke .70
            engine                                                            
          Centrifugal fan design with angled ventilation holes draws air      
            through the motor and across the windings and magnets for improved
            cooling                                                           
                                                                              
INCLUDES: .40 Brushless Electric Motor with Backplate and Gold Plated Female  
            Plugs                                                             
                                                                              
REQUIRES: 90A brushless ESC                                                   
                                                                              
SPECS:    Rated Power: 1110W                                                  
          Rated Voltage: 18.5 - 22.2V                                         
          Rated Current: 50 - 60A                                             
          Maximum Current (10 sec): 90A                                       
          No Load Current: 1.5A                                               
          Phase Resistance: 23.0 miliohms                                     
          Maximum Efficiency: 85%                                             
          kV: 490                                                             
          Poles: 14                                                           
          Shaft Diameter: 0.20" (5mm)                                         
          Shaft Length: 0.45" (11.5mm)                                        
          Weight: 12.3oz (350g)                                               
          Lead Wire Length: 4.3" (110mm)                                      
          Length of Motor Can to Backplate: 2.1" (52.5mm)                     
          Diameter of Motor Can: 1.98" (50mm)                                 
          Length/rear of Motor Can to Prop Washer: 2.7" (69mm)                
          Prop Washer Diameter: 1.06" (27mm)                                  
          Thickness of Motor Mount: 0.16" (4mm)                               
          Width of Motor Mount: 2.67" (68mm)                                  
          Height of Motor Mount: 2.67" (68mm)                                 
                                                                              
          Performance for this motor with different props and LiPo cells is as
            follows (all data with 80A ESC):                                  
          Prop Size              Max Electric Current      LiPo Cells         
          14 x 8                       45A                     6S             
          14 x 10                      55A                     6S             
          15 x 8E                      50A                     6S             
          15 x 10E                     60A                     6S             
          15 x 10E                     42A                     6S             
          16 x 8                       58A                     6S             
          16 x 10E                     51A                     5S