FEATURES: Ideal powerplant for 56 size aircraft-provides extra power for       
            hovering and 3-D type manuevers, also provides torque for turning  
            larger diameter props for more realistic scale filght              
          Broad power band suitable for Scale as well as Sport models          
          Same mounting bolt pattern as the FL-70 and FS-70 Ultimate           
          New 61N carburetor with extended intake tube eliminates reverse flow 
            tendency of air/fuel mixture, carb is reversible 180°              
          Blow-by internal oil system eliminates the need for a crankcase      
            breather fitting                                                   
          Adjustable exhaust outlet direction and exhaust port to muffler      
            distance                                                           
          Same muffler as the O.S. 81FS-a offers a pleasant exhaust sound with 
            a lower sound level                                                
          Two year limited warranty                                            
                                                                               
INCLUDES: O.S. FS72-a 4-Stroke Aircraft Engine with muffler, header, type F    
            glow plug and manual                                               
                                                                               
REQUIRES: Fuel: 10%-20% nitromethane with 18% lubricant. Synthetic, castor, or 
            a synthetic/castor lubricant blend may be used.                    
          NOTE: Certain four-cycle fuels cannot be used due to low oil content.
            However, SOME four-cycle fuels such as the Wildcat 4-Cycle 15%     
             may be used due to its 18% oil content.                 
          When choosing fuels for this engine, be sure to select a fuel with   
            at least an 18% lubricant content.                                 
          Propeller: Sport and aerobatic scale 12x7, 13x6-8, 14x6-7            
                                                                               
SPECS:    Displacement: 0.72 cu in (11.79cc)                                   
          Bore: 1.063" (27.0mm)                                                
          Stroke: 0.822" (20.6mm)                                              
          Weight: Engine, 16.79oz (476g)                                       
            with Silencer & Manifold, 18.7oz (530g)                            
          Power output: 1.2 PS, 1.18 HP/11,000 RPM                             
          Practical RPM: 2,400-12,500                                          
          Crankshaft Thread Size: 1/4 x 28                                     
          Height from Bottom of Mounting Tab to Top of Crankcase: 3.5" (90mm)  
          Width of Crankcase below Mounting Tabs: 1.4" (36mm)                  
          Center of Mounting Holes Same Side: .79" (20mm)                      
          Center of Mounting Holes Opposite Side: 1.8" (45mm)                  
          Center of Front Mounting Hole to Drive Washer: 1.9" (49.5mm)         
          Center of Rear Mounting Hole to Drive Washer: 2.7" (69.5mm)          
          Center of Crankcase to Center of Needle Assembly: 0.83" (21.3mm)     
          Center of Crankcase to Outer Edge of Needle Assembly: 1.3" (33.7mm)  
          Muffler Angle in Relation to Engine: 11°                             
                                                                               
          Needle Settings: High Speed: 2.5 - 3 turns out from fully closed     
                           Mixture Control (low speed): 2 turns out from fully 
                                       closed