1738: Bernoulli’s principle - The book of science

Bernoulli’s principle
Sailing
Cutting through to the essence
Commentary

Bernoulli’s principle

Liquids and gases increasing in motion
have the energy of their increase
subtracted from their pressure
controlling the flow of fuel into a carburetor
and lifting the wing of an airplane
so that the sum of all forms of energy remains constant.

Sailing

Some might think a wind,
filling a sail,
pushes the boat, but this is not so.
The sail is only a flexible airfoil
whose curve forces the air passing on one side
to flow more quickly than the air passing on the other,
so that the increase in speed
is compensated by a decrease in pressure
that pulls the boat through the sea, even against the wind.

Cutting through to the essence

Bernoulli’s principle, stated for an ideal fluid—
with no viscosity, no drag, and no compressibility,
is true enough to help with understanding,
true enough to lift an airplane
even though all kinds of odd things happen
as air swirls past.

Wilbur and Orville Wright demonstrated heavier-than-air, controlled flight in 1903. Before this, in 1901, they built a wind tunnel to improve the shape of their wings. Possibly the first person to realize that Bernoulli’s principle explains the lift of an airplane wing was Edward Chalmers Huffaker, in a letter to Samuel Pierpont Langley in 1893. In 1895, Wilbur and Orville Wright obtained a copies of publications related to flight, including a paper by Huffaker, from the Smithsonian Institution. In 1911, Gustave Eiffel proved that Bernoulli’s principle was responsible for the lift produced by an airfoil.

1738 Bernoulli’s principle

The book of science

Bernoulli’s principle

Sailing

Cutting through to the essence