Which of the following is NOT one of the basic wing types on modern airplanes?

The correct answer is "Curved" because it does not represent a basic wing type commonly recognized in modern aviation design. The traditional wing shapes utilized in aircraft include straight, swept, and delta wings, each serving specific aerodynamic purposes.

Straight wings are typically found on slower aircraft, offering good lift at low speeds but can result in higher drag at higher speeds. Swept wings are designed to delay the onset of shock waves and reduce drag at higher velocities, making them prevalent in jet aircraft. Delta wings possess a triangular shape that allows for stability and control at high speeds, particularly during high-performance flight conditions.

In contrast, "curved" wings lack a specific definition within the context of standard wing types and may be considered a generic term that does not conform to the established categories utilized in aircraft design and aviation studies. Recognizing these defined types plays a critical role in understanding aircraft performance, stability, and control characteristics.