This is the OS Engines 46LA non-ring .46 glow engine, with 40D carburetor and included E3020 Muffler

Features:

• More cooling fin area extends the life of the engine, and virtually eliminates engine seizures in the air
• Added "webbing" on the crankcase strengthens high-stress areas to help ensure that they stand up to the rigors of learning to fly
• Overall tighter needle valve fit utilizes an "O" ring to help maintain the performance levels you need
• A fuel inlet that points up allows for easier fuel line access for fueling and defueling

Specifications:

• Engine: 46LA    
• Displacement (cu in): 0.15 (2.5 cc)     
• Bore (in): 0.598 (15.2 mm)    
• Stroke (in): 0.539 (13.7 mm)    
• RPM: 2,500-18,000     
• Output (HP@rpm): 0.41 @ 17,000    
• Weight (oz): 4.87 (138 g)   
• Recommended Props: 7x5, 7x6, 8x4, 8x5