Calculation & Design Considerations The $15text{ kg}$ weight is a critical design factor, as it dictates the required Wing Area for a safe and realistic Wing Loading (the aircraft’s weight divided by its wing area). Wing Loading: A scale warbird of this size ($15text{ kg}$) typically aims for a moderate to high wing loading, often in the range of $150 text{ g}/text{dm}^2$ to $200 text{ g}/text{dm}^2$ or higher. Required Wing Area: To achieve a moderate wing loading of $160 text{ g}/text{dm}^2$ for a $15text{ kg}$ aircraft: