Monday, May 07, 2007

Cars vs Bikes

A simple observation, the convenience of a car is that it can take you to your specific destination and is generally a lot faster than most other forms of transport.
A car weighs roughly just under a tonne (well maybe not just but relatively speaking) for a four door sedan, the model of choice amongst most metropolitan drivers followed by 4x4s. Your average person let's just say weighs around 80kg so it takes something that weighs hundreds of kilo's to move around something under 100 kilo's, considering that on an international flight they only allow you 25 kgs of luggage for arguements sake let's assume most people don't generally haul more than 25kgs around in their car.
Weight wise the car exerts more effort transporting itself than it does transporting you. And that's import in itself, the energy required to move a car is generated through combustion usually an engine.
Engine power is measured in terms of horsepower, a lot of horses. Compared to using horses cars I guess are efficient, 100 horses generating 100 horsepower would weigh a lot more than 1 tonne and take up a lot more space.
To do this it has to consume a fuel that has no substitutes on a free market and requires energy to be expended in its production and transportation plus various suppliers in the value chain require returns on their inputs so their is a margin at each stage of wholesale, furthermore said fuel requires future investment in exploration that needs to be allowed for.
Now the same applies to food but consider.
My bike weighs at most 20kg, UCI regulations say the minimum mass of a racing bycicle is 6.8kg to support an average weight of 80kgs, most engineering practices require a factor 10 safety load that is usually bridges and so fourth are designed to withstand pressures that are 10 times greater than their expected normal load.
Certainly true for cars and bikes do pretty good at supporting weights that far exceed their own.
Furthermore the occupant on a bike has to propel themselves, that is they exert their own energies into the bike to make it go. The bike just makes a persons own efforts more efficient.
I mean yes Lycra is bad, cyclists are generally pussies and unpredictable on the roads, but the bike itself is a marvellous invention, the car whilst an engineering achievement is horribly inefficient and not as convenient as we may first assume.

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