2-speed tricycle

2-SPEED TRICYCLE DRIVETRAIN

PROJECT DESCRIPTION
Students working on this project designed a 2-speed drivetrain for hand-powered tricycles. The drivetrain works by combining a series of bicycle freewheels to obtain one speed by pedaling forwards and one by pedaling backwards, all without a derailleur.

TEAM MEMBERS
From L to R: Elizabeth Au, Mario Bollini, Xin He, Lindsay Todman, Katherine Wong (Not pictured: Lab instructors Gwyn Jones, Amos Winter)

PROJECT DEVELOPMENT PROCESS
The documents here describe the milestones of the project development process

1. Strategy presentation

2. Concept presentation

3. Most critical module presentation

4. Final presentation

5. Poster for Boston Museum of Science

SUMMER FELLOW PROJECT CONTINUATION
This project was continued as a fellowship by Mario Bollini at APDK, Kenya, and Lindsay Todman at DAGE and Mobility Care, Tanzania. Each student brought the tricycle to a stage where it could be trialed by users. At the time this information was posted (Sept. 2007), APDK was in the middle of user testing. Because of such overwhelming positive feedback from users, APDK plans to put the 2-speed tricycle into production within the next six months.

Click below the pictures to the right for all the pictures from the summer fellows who worked on this project.


Mario Bollini's Pictures	Lindsay Todman's Pictures

Mario's tricycle website
Mario Bollini has compiled a fantastic website that chronicles the project's development in Kenya and includes a full set of instructions to build the 2-speed drivetrain. The site also has many pictures and some videos of the trike in action.

2-speed trike in action
Click on the links to the left to see videos of the 2-speed tricycle.