09 The Cruise

Question 1

Where is the Maximum Straight and Level Speed found on the:

• Total Drag, Thrust graph
• Power available, Power required graph

Answer 1

• Max S and L is found where the Total Drag curve = Thrust curve
• Vmd gives speed of max acceleration
• Max S and L is found where Power available curve = Power required curve

Question 2

What effect does Altitude have on:

• Max S and L CAS
• Max S and L TAS

Answer 2

• CAS: Max S and L speed decreases with altitude

- TAS: Max S and L speed increases with altitude but then decreases and very high altitude

Question 3

The maximum Straight and Level speed increases when what is true for:

• CG position
• Engine position

Answer 3

• CG is aft

- Engines are underslung

Question 4

What is the Aerodynamic Ceiling?

Answer 4

The altitude at which the speeds for low speed buffet and high speed buffet are the same