Original sentence: The Hiller ROE-1 Helicycle was a single seat ultralight helicopter designed in 1957.The aircraft was commonly referred to as the Hiller "Helicycle" or "Rotorcycle".The various military branches considered this, and similar helicopter designs, to be ideal for infantry personnel, however the aforementioned problems, coupled with very limited payload capacity prevented this use too.This helicopter caused many people to think small, personal helicopters would soon be developed and become commonplace; however difficult flying characteristics and high production costs prevented this from occurring
Edited sentence: Apostolo, Giorgio.Hiller Aviation Museum: The First 100 Years of Aviation.ISBN 9780517439357.New York: Bonanza Books.The Hiller YROE-1 Rotorcycle was a single seat ultralight helicopter designed in 1957.The Illustrated Encyclopedia of Helicopters