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Trimmed
Aircraft Answers
- An airplane in
trimmed flight has a wing lift(W) of 30,000 Newtons. It has a wing distance(dw)
of 2 meters and a tail distance(dt) of 10 meters both located
aft (behind) the center of gravity(cg) . Assume that the
direction aft of cg is positive.
- What
is the magnitude of the the tail lift(T)? 6,000
Newtons
- Is the tail
lift positive or negative? Negative
- What is the
total lift of this trimmed aircraft? 24,000
Newtons
- You must design
an airplane with a wing with a lift(W) of 40,000 Newtons, a tail lift(T)
of - 8,000 Newtons and a wing distance(dw) of 3 meters aft
of cg.
- What
is the total lift? 32,000 Newtons
- What must
the distance of the tail(dt ) be aft of cg?
15 m
- Your customer
now wants a wing distance(dw ) of 2 meters aft of cg,
what must the tail distance(dt ) be aft of cg?
10 m
- Your customer now
wants the tail in the original design placed forward of the center of
gravity(a canard configuration).
- Is
the canard lift in this design positive or negative? Positive
- What must
the distance of the tail(dt ) be forward cg?
15 m
- Is the canard
distance(dt) from the cg positive or negative?
Negative
- What is the
total lift for this canard configuration? 48,000
Newtons
- How does
the total lift differ from the conventional design? Greater
by 16,000 Newtons
- What type
of tail design did the Wright Brothers Airplane have? Canard
Configuration
- A cargo plane trimmed
for normal flight has a total lift of 120,000 Newtons. This aircraft's
Wing lift(W) is 150,000 Newtons and it's wing distance(dw)
of 5 meters behind cg. What is the tail distance(dt)
behind cg? 25 m
- The airplane in
the previous problem had some of it's cargo shift aft. This caused it's
cg to shift 2 meters aft.
- What
is dw now? 3 m
- What is dt
now? 23 m
- With no adjustment
by the pilot, what will the airplane do? Lose
lift/ Fall back and lose altitude/Tail First
- If wing lift(W)
remains constant, the pilot must adjust tail lift (T) to what value
to maintain trimmed flight? 19,565 Newtons
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