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#21
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Don Stauffer in Minneapolis wrote: > > Steve wrote: > > > > > Wind resistance increases as the cube of speed, no getting around that. > > > The FORCE of resistance goes as the square. The POWER needed to drive > the force at any given velocity varies as the cube. So the fuel > consumption does go as cube. Not if you are measuring consumption as miles per gallon. Consumption in terms of gallons per unit time is cubed, but not in terms of distance traveled. Ed |
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#22
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C. E. White wrote:
> > Don Stauffer in Minneapolis wrote: > >>Steve wrote: >> >> >>>Wind resistance increases as the cube of speed, no getting around that. >>> >> >>The FORCE of resistance goes as the square. The POWER needed to drive >>the force at any given velocity varies as the cube. So the fuel >>consumption does go as cube. > > > Not if you are measuring consumption as miles per gallon. > Consumption in terms of gallons per unit time is cubed, but > not in terms of distance traveled. > > Ed True, I meant specific fuel consumption, rate per hour. That is of course a non-typical measurement for automobiles, much more common on aircraft and I should have pointed this out. |
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