From FlightGear Wiki
The JT-5B is a homebuilt autogyro, designed and built by Jukka Tervamaki from 1969-1973. Initially developed from the JT-5, the the JT-5B featured a 100mm larger propeller diameter for better efficiency, and a lighter rotor head. The single prototype model was sold to Vittorio Magni in Italy the following year, in 1974. The design was later named 455MT-5 and M-5, with more the modern revision being crowned the Magni M20 Talon