Xtracycle Hopper tech specs. Motor: 750W hub motor with torque sensor Top speed: 28 mph (45 km/h) on pedal assist or 20 mph (32 km/h) on throttle Range: 20-50 miles (32-80 km) Battery: 720 Wh ...

To prove it would work, Seabulk built a $850,000, full-size prototype consisting of one complete cargo hold/hopper and conveyor. They tested gypsum in the prototype and were able to demonstrate ...