Lecture 9 Flashcards
1
Q
What is drag?
A
Resistance to motion in a fluid
2
Q
What is a Reynolds number?
A
A number which indicates whether a fluid will flow past a material
3
Q
What is lift?
A
A symmetrical body moving through a fluid
4
Q
What is aerofoil?
A
the structure of curved surfaces designed to favour lift and drag
5
Q
What is wing loading?
A
Weight divided by area
Lower wing loading = more lift
6
Q
How does gliding work?
A
The forces must be balanced
7
Q
What is slope soaring?
A
Gliding with the help of wind
8
Q
What is thermal soaring?
A
Hot air rises, therefore, birds circle around the column generated by the heat
9
Q
How does hovering work?
A
Driving the air downwards to generate lift both down and up
