INFO SHEET: The Yike Bike - Radical bike redesign - The YikeBike is a light, foldable, easily portable, electric bicycle. It is a radical redesign of the traditional bicycle. Christchurch inventor and entrepreneur Grant Ryan developed the YikeBike.
VIDEO STORY (4 minutes) The YikeBike Story - The YikeBike is a light, foldable, easily portable, electric bike developed by Christchurch inventor and entrepreneur Dr Grant Ryan and his team. It is a radical redesign of the traditional bike.
CYCLING AERODYNAMICS TEACHING RESOURCES: This story looks at cycling aerodynamics, drag and rolling resistance. It shows how wind tunnel tests are helping New Zealand cyclists reduce drag to reach faster speeds.
INFO SHEET: Pedal power - Competitive cyclists have power meters to carefully monitor their training and race performance. Power is a measure of how much energy is being changed every second. For cyclists, the effort they put into pedalling either makes them go faster (extra kinetic energy – related to speed) or helps them fight against drag and rolling resistance.
STUDENT ACTIVITY - On your bikes - In this activity, students measure speed and drag for a person on a bike to determine the effects of aerodynamic drag and rolling resistance on a cyclist’s maximum speed.
IMAGE: Cycling power meter A crank-based power meter as used by many competitive cyclists. Most competitive cyclists have a power meter and a bike computer. A sensor attached to the crank measures force. The bike computer calculates pedalling power by multiplying force and speed.
IMAGE: Forward and opposing forces - When forward forces are bigger than opposing forces, you accelerate. When the forces are balanced, your speed stays the same. Your forward force comes from pushing and pulling on the pedals to make the back tyre push backwards against the road. The two main forces that oppose your motion are aerodynamic drag (air resistance) and rolling resistance of the tyres against the road. Your forward force comes from pushing and pulling on th...