Aaron Cantrell
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Portfolio Piece: Project EV-XI

The EV-XI project was a thesis project in electric vehicle design and fabrication. Jake Horsey and Prateek Rajbhandari decided to undertake creating a new vehicle from scratch as their final project at Hampshire College. I was the third member of the team, working on the project outside of my normal full class load. The project was initiated, conceptualized, engineered, designed and fabricated by the three of us, making it a fully student run and created project. EVs are the way of clean and efficient transportation. We were excited to engage in this endeavor both from a technical as well as a social standpoint. I acted as a supporting member of the project, helping with the electrical system, fabrication and machining, electromechanical performance analysis, created the web-site and as person to bounce ideas off of. The time span of the project was over the course of a school year and all design through fabrication took place during this relatively short window. The greater overarching concept that we wanted to respond to and create a physical manifestation of was that of scaling transportation infrastructure appropriately so that 20 lbs vehicles aren't on the same roadways as 10,000 lbs vehicles.

Before fabricating the vehicle, it was completely designed in SolidWorks and every part modeled. Nearly all parts of the vehicle were machined and welded by the three of us, including the chassis, the rack and pinion, the steering wheel, pedal assembly and even the gearing. The vehicle has a full suspension system, hydraulic disk brakes and is direct drive, exploiting the linear torque curve of a 48 volt 280 amp brushed motor system that is capable of accelerating the vehicle to it's top speed in about 5 seconds. The project web-site and Prateek's photo gallery better documents the project than this page, so please take a look at it if you're interested. We have since shown the vehicle at an entrepreneurship conference as well as a renewable energy workshop with very positive reception that ignites conversation about the future of transportation.

Team Members: Jake Horsey, Prateek Rajbhandari and Myself.

Time Line: 2010-2011 School Year.

Software Used: SolidWorks, CamWorks and Mathematica.

Documentation: Web based project showcase.

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