In 1891 a Daniel I. Lybe filed a patent application on a vehicle
powered by a wound up spring. The spring of the vechicle was
given an initial winding, then would recoup winding on the
downhill runs, and expend the spring energy on the level and
uphill. Both arm and foot power assisted the winding, and 30 mph
was claimed. The inventor believed his machine would "afford a
mild and pleasing form of exercise, in addition to its speed
advantages." The Lybe vehicle was entered in the first motor
race in the U.S., held in 1895, but it is not known if it
finished.