|The AeroVelo Eta surpassed 89 miles per hour last month|
There numerous engineering challenges in designing this bike. A recumbent bike is used to reduce frontal area. To keep weight and aerodynamic drag down, it needed to be as small as possible, but yet big enough to allow a human to pedal without hitting the shell with his feet or knees. The shell was made of carbon fiber to keep its weight down. Computational fluid dynamics (CFD) analysis was used to minimize aero drag. A window to allow the rider to see the road would increase drag, so there are two cameras to show the cyclist what's going on outside. Another issue was making sure the operator had adequate ventilation with a minimal increase in drag. You can see a small tube sticking up at the rear of the vehicle.
Here's a video that shows the bike in action: