Sizing

Question 1

Name the weights contributing to MTOW

Answer 1

W0 = W_crew + W_payload + W_fuel + W_empty

Question 2

What are the stages of a simple cruise mission profile?

Answer 2

1. Takeoff
2. Climb
3. Cruise
4. Loiter
5. Land

Question 3

What might a military mission profile entail?

Answer 3

Additional loiter and climb stages for combat and or weight/payload drops mid flight.

Question 4

What is SFC

Answer 4

Specific fuel consumption:
Rate of fuel consumption divided by resulting thrust

Question 5

How are cruise mission segment weight fractions found?

Answer 5

Breguet range equation

Question 6

How are loiter weight fractions found?

Answer 6

Endurance equation

Question 7

Discuss the significance of L/D and its influences in a subsonic regime

Answer 7

• Lift-to-drag ratio is a measure of the design’s aerodynamic efficiency.
• At subsonic speeds, influenced by wingspan and wetted area.

Question 8

How does Aspect ratio affect L/D?

Answer 8

Typically increased A means higher L/D due go lower induced drag.

Question 9

What does a range trade-off study investigate.

Answer 9

Gross weight vs Range

Question 10

What does a payload trade off study investigate?

Answer 10

Gross weight vs Payload.