The Wright brothers did create a glider ( https://airandspace.si.edu/collection-objects/1900-wright-gl... ). They also created a powered airplane a gasoline engine and propellers ( https://www.nps.gov/articles/wrightflyer.htm ). They also continued to develop their planes after that first flight. I'm amused by the number of people I've met who seem to think that they flew around a little, then stuck everything in the barn and went back to bicycle making.