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Description

Bernoulli's Principle says "When a fluid is moving at a higher velocity, it's total pressue is lower". This activity is a practical demostration of the principle therefore how aerofoils produce lift. It also demostrates how air detaches from the aerofoil to induce a stall condition.

Resources

x1 sheet of paper per participant

Instructions

Introduce Bernoulli's Principle as above.

Hold the short side of the paper so that it hangs downward like a waterfall.
Blow very close to the upper surface of the paper. What happens?
The paper should rise.
Explain the relative low pressure above the paper and the relative high pressure below the paper produced an upward force.
This force is lift.
Questions?

Below further away from the upper surface of the paper. What happens?
The paper should rise less.
Explain the pressure difference is still there causing lift however the airflow has detached from the paper.
This section of the paper is no longer producing lift meaning less lift is being produced overall.

Below far away from the upper surface of the paper. What happens?
The paper will not rise at all.
Explain there is no airflow over the wing anymore therefore no pressure difference.
With no pressure difference, there will be no lift being produced.
When no lift is being produced, this condition is called an aerodynamic stall.
Questions?

Tags

• aerodynamics
• air activities
• air activities level 3
• fluid mechanics
• Hertfordshire Scouts Air Activities
• lift
• Stall

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