The bottom portion of this graph shows the power required to travel at a specific speed at various grades of hills. The upper portion shows the ability of a person to provide power before becoming exhausted. The human power curves were presented by Douglas Malewicki at the 1983 IHPV Scientific Symposium.

To use this graph choose a baseline operating point. For example, the power required to propel the bike at 15mph (24kph) on a zero slope is seen to be 100 watts (bottom portion). Following up the 100W line we find that a 'healthy person' can provide 100W of power for about 5 hours before becoming exhausted.

Now if the same person wanted to ride up a 3% grade at the same 15 mph (24kph) the person would become exhausted within a few minutes as 300W of power is now required. But if the electric bike could provide 200W assistance the person only needs to apply 100W (the same power as if travelling on the flat) to achieve this speed on this gradient. 

So now ask why go to a Power Assisted Bike

• Go further with the same amount of energy. Allows you to see more.
• Makes commuting far more viable as you can cover greater distances in less time.
• No licence, no rego, easy parking and Environmental Friendly.
• Everyone can ride a bike, so it is a real family transporter.
• The rider controls the amount of assistance provided by the Power Pack so exercise can be graded based on fitness, not terrain.
• Quite and allowed on bike tracks.
• Excellent for those with long terms leg damage or convalescing