The radical Cal-Poly/ A.S.M.E. Phoenix features an aerodynamically favorable composite body (with a tubular substructure), minimal ground clearance, and a top speed near the "double nickel."
Greg Johnson's 50-MPH machine relies on a lightweight, fish-shaped fairing and "prone power" to cut down on aerodynamic drag.
Some entrants merely adapted wind-cutting fairings to modified bicycle frames. This tandem is capable of traveling at over 43 miles per hour.
Human powered vehicles typically use ultralight frames just strong enough to serve their purpose. Notice the speed-inducing "stiff" gearing ratio shown here.
PHOTO: BOB KEIM