Efficycle is an intercollegiate design competition for undergraduate and graduate students where teams have to design and fabricate an energy efficient entirely human powered three-wheeled vehicle. The vehicle must be aerodynamic, highly engineered and ergonomically designed. The design should be commercially viable as a product and should be attractive to the consumers because of its visual appearance, performance, reliability and ease of operation.

In 2010,IIT Roorkee team "SeiGeR" stood overall 6th position in this event organized by UIET in Chandigarh from 23rd–24th Oct . SeiGeR IITR bags 1st prize in “Utility & Maneuverability Event”. In 2011,team "Seiger" gave a fabulous performance and stood overall 4th position in this event and also bags 2nd prize in "Acceleration". The team has set its sights on the same competition in 2014. A group of self motivated and highly educated students are prepared to bag the first prize in this competition.

Mechanical Design
Upon carrying out literature survey, two general kinds of Human Powered Vehicles have been found existing. These two designs are: 1. Delta Design – In Delta design, there are two wheels on rear side and one wheel on front side. 2. Tadpole Design – In Tadpole design, there are two front wheels and one rear wheel. Both the designs have their own advantages and depending on the requirements, one may select any of them. We considered following factors before finalizing on Tadpole design: • Weight Distribution • Center of Mass • Braking

1. Front Brakes – We decided to go for the disc brakes in both the front wheels as Disc brakes can be mounted on the hub the wheels.
2. Rear Brakes – A reliable braking system for the rear wheel, V-Brakes because of its higher mechanical advantage and because of stable positioning of brakes in rear fork.
Drive Train The drive train consists of an innovative transmission system which was invented by Alberto Domenge in 1992. This system allows the captain and stoker to peddle independently of each other.

When a vehicle travels round a bend, the inside wheel must follow a tighter curve than the outside wheel. To achieve this, the geometry of the steering must be arranged to turn the inside wheel through a larger angle than the outside wheel. The 'Ackerman' steering geometry provides a simple solution to this problem. Modified Ackerman Steering System has been designed for our HPV so as to allow the inner wheel to turn through a smaller radius as compared to outside wheel.

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