The eCortina v2 is a one-off hybrid bicycle which is designed to be driven by motor, pedal-assisted or if you like you can pedal it like a regular bike. This e-bike is designed by Roy Prince.
Roy points out that his "hybrid electric bicycle system is designed that one can pedal only (human power), motor only (electric power), or in hybrid mode both motor and pedal at the same time. Under hybrid running the distance one can ride under one charge is extended."
Electric bicycles normally fall into two categories: those powered by a motor and others that are powered by human pedaling power (pedal-electrics). For Roy this was not enough for an ebike, he decided he want three not two and the result is his interesting creation, the eCortina v2 hybrid.
To allow pedaling without the motor and motoring without force is due to the use of standard bicycle parts, which include two BMX-style freewheels (for pedaling w/o motor and motoring w/o pedals). It now features a motor powered by lithium-polymer batteries and controllers originally designed for use in radio-controlled models (for efficient range and avoiding over-charging). A 3-speed Shimano Nexus rear hub is also incorporated.
This hybrid bike is 27 kg (60 pounds) in weight, because of its functions it is no lightweight but that's OK. The work is still in progress. It will soon cross 15 miles on one charge (with some paddling).
Source: gizmag and Bicycle Design