bi241@[EMAIL PROTECTED]
wrote:
>On Apr 12, 4:49 pm, ecarecar <ecare...@[EMAIL PROTECTED]
> wrote:
>
>
>>I am looking for a plot of engine speed vs. fuel consumption. Is one
>>available anywhere? I am not at all picky about what specific engine.
>>
>>
>
>By laws of aerodynamics, air drag is pro****tionate to the square of
>the object's velocity. If the speed is doubled, then it requires a
>quadrupled energy to overcome the drag. At the same time, the object
>travels twice the distance. Spending four times the amount of energy
>to propel the object twice the distance means the energy efficiency is
>cut in half.
>
>
>
Actually, it is a quadrupling of the force.
>Likewise, if the object's velocity is trippled then energy efficiency
>is reduced to one third.. and so on...
>
>In automobile, rolling friction is also a factor but it's a linear
>drag, while air drag is a quadratic drag. The combined result is
>closer to the air drag only model.
>
>In layman terms, if you've got a car that does 30 mpg at 60 mph, then
>you can expect 15 mpg at 120 mph. It can be more or less, depending on
>the efficiency of the engine's combustion chambers, and its own
>internal friction at higher rpm
>
>
>
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