Master Airscrew Propellers Proudly Made in The USA! For more than 40 years we have envisioned, designed, and manufactured model airplane and multi rotor propellers with utmost precision and care. Constantly improving our technology and production processes throughout the years, we have developed perfectly efficient and incredibly silent blades, second to none. Recognised worldwide as a benchmark in the hobby industry, Master Airscrew Model Aircraft Propellers are preferred choice for many experienced flyers and hobbyists.