by the way, our fellow countryman, fyodor evstaviev, is the inventor of a vertical take-off aircraft.he development aerscience. so, we will get acquainted with his biography right now in our regular column, people who changed the world. let's see. fedor evstafiev was born in 1862 in the bryansk region. from the age of 15 he worked as a barge hauler, planner and carpenter. in 1903 he moved to gomel and got a job in a locomotive depot. without an engineering education, fyodor evstafiev developed and assembled. various devices for steam locomotives and railway tracks, for punching fire and smoke pipes, cleaning locomotive boilers from soot, and tracks from snow. he invented the jack for lifting wagons. spark arrester, trestle for coal supply. the interests of the self-taught inventor were not limited to railway transport. evstafiev also proposed mechanisms for water, trying to improve the mushroom wheel, he thought about a device that, with the help of blades , could move not only through water, but in the air. after 6 years of work in 1909, evstaviev created a model of a helicopter that