The Evolution® .91NX single-cylinder, 2-stroke glow engine is revolutionary for modelers who demand the most of their engines. This engine provides the performance of a .91-size engine in the case size of a .61-class engine, allowing you to …
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It’s perfect for sport, 3D and scale flying, but that’s just part of what makes the GT15HZ great. Size makes it an easy fit in most .90-size helicopters. It also offers a pumped carb, superb fuel economy, and …
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The easy way to improve performance in a .40-size model is to simply drop in a 55AX ABL engine from O.S. More horsepower allows the engine to swing bigger props, which means sharper 3D maneuvers, more precise patterns …
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With 10% more power than similar 2-stroke engines, the O.S. GT22 features a reinforced Pitts style muffler and a beam mount for easy installation. Now, let’s face it: The O.S. GT series is something to text home about …
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