The MD-520N is an improvement of the MD-500 series, utilizing a NOTAR (no-tail-rotor) design, which reduces noise considerably, and eliminates the collision risk of exposed rear rotor blades.
The MD-520N is an improvement of the MD-500 series, utilizing a NOTAR (no-tail-rotor) design, which reduces noise considerably, and eliminates the collision risk of exposed rear rotor blades.