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This Quad was built from the ground up with some very specific design parameters. You can see pictures of the build up here. Some of the features include: rear suspension, high cargo capacity, reversible rear seat, dog-running attachments, ecospeed electric system. See more what Bill is about at WoofDriver.com.
Besides getting power from the captain, this Quad is equipped with a custom EcoSpeed middrive. The EcoSpeed operates independantly from the pedals and can be used on its own or in conjunction with human power. Power is supplied by two 48V batteries.
The heart of the drivetrain is the jackshaft which ties everything together. Chains from the EcoSpeed motor, the pedals, and the Nuvinci transmission are all connected via freewheels so that each operated independantly.
Because the Nuvinci and pedal chains are both on the same side of the jackshaft we incorporated a stabilizer bar to equalize the force on the jackshaft.
The Nuvinci N360 is our preferred transmission for electric setups. It has a wide range, shifts smooth, and is very strong.
At the front we installed the Patterson 2-speed drive.
Because of the rigitity of the frame we built a limited-suspension rear axle which has about 2 inches of travel. This allows all four wheels to stay on the ground while turning or riding over uneven terrain.
Our "Posi-Axle" utilizes double freewheels to prevent the slippage that can occur with a geared differential.
All four wheels utilize the Avid BB7 disc brakes.
The rear seat can be positioned anywhere along the cargo rack. It can be set to face forward or backwards.
The front seat can be positioned along the frame in any of the holes on the mount.
Both shifters were combined on the right side so that the throttle could operate more easily on the left hand.
The throttle is easily accessible with the left thumb and feels natural.
The steering pivot uses a split-level tierod system. The actual pivot uses sealed bearings to provide smooth steering.
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