I... urgently need to learn from professionals specializing in ultralight aircraft. Is there anyone who can assist me? My primary objective is to achieve successful takeoff without modifying the steel-structured airframe. Beyond the aircraft data, I must add that nearly all materials are sourced domestically within my country. The airframe structure employs standard steel sections. It is powered by a compact general-purpose 190F engine (weighing 30+ kg, rated at ≈14 HP — I have optimistically amplified the output via a pulley transmission system, with an integrated 6L fuel tank). The wings consist of 2cm-diameter steel tubes (as spars), cedar plywood ribs (airfoil: FX74CL5140), and tri-color striped truck tarpaulin fabric (as skin covering). My body weight is 45kg. This summarizes all available information, and my current goal is to achieve effective real-world takeoff as soon as possible.