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Popular Rotorcraft Association Click on Image to Donate January 2024 EZINE Free Preview Membership not required Click here to join our email contact list Welcome to the Popular Rotorcraft Association We are based in Mentone Indiana USA at the PRA owned Mentone Airport. Founded in 1962 by Dr. Igor Bensen the inventor of the Bensen Gyrocopter we have grown to include rotorcraft of all sorts with members in over 80 countries. We are a group of people who love rotorcraft gyroplanes and helicopters some homebuilt from scratch some from kits and some factory assembled.