C10 - Designing a Wing

Question 1

‘____’ has the most significant effect on a Wing’s Spanwise Pressure Gradient?

Answer 1

Aspect Ratio.

Question 2

Which type of Aircraft is associated with having a High Aspect Ratio?

Answer 2

Gliders.

Question 3

For a given Aspect Ratio, a wing with an elliptical pressure distribution is the ‘____’ efficient?

Answer 3

Most.

Question 4

True or False. An elliptical wing produces the most Lift, for the smallest total energy lost in Tip Vortices?

Answer 4

True.

Question 5

True or False. An elliptical wing doesn’t produce a constant section Lift Coefficient across the entire span?

Answer 5

False. It does.

Question 6

The rectangular wing has a ‘____’ Wingtip Vortices and the ‘____’ Downwash towards the Wing Tips (2)?

Answer 6

• Larger.

- Greater.

Question 7

A straight wing with taper produces slightly ‘____’ Downwash mid-wing. Downwash ‘____’ slightly towards the Wing Root and ‘____’ significantly towards the Wing Tip, where the Tip Vortices are ‘____’ (4)?

Answer 7

• Less.
• Increases.
• More.
• Large.

Question 8

A straight wing with a Taper Ratio of about ‘____’ can approach the efficiency of the elliptical wing?

Answer 8

0.5.

Question 9

Define the effects of Downwash on a Swept Wing (2)?

Answer 9

• Greatest at Wing Root.

- Smaller closer to Wing Tip.

Question 10

True or False. The Downwash on a Swept Wing increases due to the Tip Vortices?

Answer 10

True.

Question 11

Where on a Swept Wing is the Effective Angle of Attack and Lift Coefficient greatest?

Answer 11

Close to the Wing Tip.

Question 12

What are the common Taper Ratios for Swept-back Wings?

Answer 12

0.4 to 0.25.

Question 13

Name five types of planform wing designs?

Answer 13

• Rectangular.
• Sweepback + Taper.
• Elliptical.
• Taper (0.5).
• Delta.

Question 14

Define Washout?

Answer 14

Reducing Lift distribution across the span of a Wing.

Question 15

Name two ways to reducing Lift being generated on the Wing by design?

Answer 15

• Washout.

- Camber.