In this comprehensive tutorial, I'll guide you through the process of surface modeling a detailed helicopter in Onshape, specifically based on the MD 500, by McDonnell. You'll learn how to insert and utilize reference images to accurately capture the helicopter's shape, and then we'll dive into advanced techniques for creating complex curved surfaces, blending them seamlessly, and achieving a realistic helicopter model. Whether you're a beginner or an experienced Onshape user, this tutorial will enhance your surface modeling skills. We'll cover everything from initial sketches to final surface refinement, including tips and tricks for achieving smooth, accurate results. Follow along step-by-step and unlock the power of Onshape's surface modeling tools.