Discussion
Consider the following statements about group weight methods:
1. Wing weight correlates with area, aspect ratio and design load factor.
2. Fuselage weight correlates with wetted area and pressure differential.
3. Undercarriage weight is typically a fifth of take-off weight.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 name the right drivers: wing weight with area, aspect ratio and design load factor, fuselage weight with wetted area and cabin pressure differential. Statement 3 is out by a factor of about five - an undercarriage is typically three to five per cent of take-off weight, not a fifth, which would be heavier than the wing.
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