The Hiller ROE Rotorcycle is a single-seat ultralight helicopter designed in 1953 for a military requirement.

[3] The helicopter folded up and could be carried on a sled-like carrier by two people or could be air-dropped to pilots trapped behind enemy lines.

The Marines did not accept the YROE due to its low performance, vulnerability to small-arms fire and the lack of visual references on the structure.

[4] In 1954, the United States Navy′s Bureau of Aeronautics selected Hiller to build its proposed design of a one-man helicopter.

[8] Data from NASM : Hiller YROE-1 Rotorcycle,[9] Jane's All the World's Aircraft 1958-59[10]General characteristics Performance