APC propellers have been popular for years and are developed based on the latest findings and manufactured using state-of-the-art machines. They are significantly quieter than comparable propellers due to their special blade shape and can achieve very high efficiency when properly matched. A wide selection of different sizes and pitches is available for optimal matching. Recent developments include the APC Slow and Electric props, which are even lighter and specifically designed for the needs of electric models and their Reynolds number range. These are available not only in the well-known gray color but also in black, and they come with adapters for standard shaft diameters.