Bicycling as Easy as Pi - (but expensive as caviar)

Discussion in 'Electric Bicycles' started by bamabikeguy, Oct 16, 2007.

  1. bamabikeguy

    bamabikeguy Active Member,0,4708509.story


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  2. For the price of that bike,I can make...lets see....25 happy time complete bikes in all different configurations.
    Mmmmm...Choices...what to do...
  3. sabrewalt

    sabrewalt Guest

    20 Pounds per Gallon

    20 lbs per Gallon... There is a credibility gap here
  4. Alaskavan

    Alaskavan Guest

    Last edited by a moderator: Oct 19, 2007
  5. HoughMade

    HoughMade Guest

    Let's see- a gallon of gas weighs- 6.3 lbs doesn't seem possible.

    A stoichiometric air/fuel mixture is approximately 14.7 times the mass of air to fuel meaning that to burn 1 gallon of gas, you need 14.7 times 6.2 lbs = 91.14 lbs of air.

    Even accounting for the fact that a stoichiometric ratio of 14.7 will not be used- 12.25 to 1 is probably more realistic- so now we need 77 lbs of air and 6.2 lbs of fuel for a total of 83.3 lbs. of combined fuel and air. Therefore, we are not dealing with 20 lbs. from 6.3, but 20 lbs. from 83.3 lbs.

    When the fuel burns, the hydrogen from the gas combines with oxygen to make H2O and the and the carbon from the gas combines with the oxygen to make CO2.

    A carbon atom has a weight of 12, and an oxygen atom has a weight of 16, giving every molecule of carbon dioxide a weight of 44, 12 from carbon and 32 (16x2) from oxygen.

    To calculate the amount of carbon dioxide which can come from a single gallon of gas, the weight of the carbon in the gasoline is multiplied by the weight of the total molecule divided by the weight of carbon alone, 44/12 or 3.67. This is because each CO2 molecule contains 3.67 times more oxygen by mass than it does carbon.

    Gasoline is approximately 87% carbon and 13% hydrogen by mass, therefore, the carbon in a gallon of gas weighs about 5.5 pounds (87% of 6.3 lbs.). So where does the other approximately 14.5 lbs. of weight come from? The oxygen in the air- remember, CO2 is one carbon atom and 2 oxygen atoms. Take the weight of the carbon- 5.5 lbs. and multiply by the amount ratio required to determine the weight of oxygen needed to make CO2, 3.67, and you get 20.185 lbs. of CO2 from burning 1 gallon of gasoline.

    Anyhoo- interesting looking bike- but $7,200? All except one of the cars I've owned in my life cost less.