Rotor X Aircraft Manufacturing (April 18, 2021). "Frequently Asked Questions". rotorxaircraft.com. Archived from the original on April 18, 2021. Retrieved April 15, 2021.
Rotor X Aircraft Manufacturing (April 18, 2021). "Frequently Asked Questions". rotorxaircraft.com. Archived from the original on April 18, 2021. Retrieved April 15, 2021.