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34 votes

Does flying slower actually save fuel?

Yes it saves fuel, unless you get really slow (well below cruise speed - more later.) Since drag (and thus power required) increases with the square of velocity it will save fuel for the total flight. ...
Gerry's user avatar
  • 19.9k
5 votes

Why is it that when autopilot is maintaining cruise, we don’t feel the changes when lift increases?

People can feel even small changes in acceleration if they happen quickly, but slow changes in acceleration would need to be very large to be perceived at all. While adjustments in flight parameters ...
supercat's user avatar
  • 483
3 votes
Accepted

How does drag change efficient cruise conditions?

The easiest way to reduce induced drag in an aircraft is to make it lighter. However, I'll assume you're talking about design / configuration changes, not operational ones. If the drag polar has the ...
Rob McDonald's user avatar
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2 votes

How does drag change efficient cruise conditions?

We use the usual approximation that the drag coefficient for the entire airplane can be expressed via the well known: $C_d=C_{d_0}+kC²_l$ The first term represents the "parasite drag" while ...
sophit's user avatar
  • 12.9k
2 votes

Does flying slower actually save fuel?

There is an optimal speed for whatever you are trying to do -- for example, and optimal speed to cover the most distance per unit of fuel is probably what you are thinking of. However, if you were ...
Rob McDonald's user avatar
  • 12.5k

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