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.
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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