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Trimmed
Aircraft Activity
If so instructed by your teacher, print out a worksheet
page for these problems.
Open the slide called
Trimmed Aircraft (with
text) and read the explanation on how to calculate wing and tail lift and
wing and tail distance in trimmed flight.
Total Lift = W +
T
- 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) cg . (Assume direction
aft of cg is positive.)
- What
is the magnitude of the the tail lift (T)?
___________________________
- Is the tail
lift positive or negative?
___________________________
- What is the
total lift of this trimmed aircraft?
___________________________
- You must design
an airplane with a wing that has 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?
___________________________
- Aft of cg,
what must the distance of the tail (dt ) be?
___________________________
- Your customer
now wants a wing distance (dw ) of 2 meters aft of cg.
Aft of cg , what must the tail distance (dt )
be?
___________________________
- Your customer wants
the tail in this design placed forward of the center of gravity (a canard
configuration).
- Is
the canard lift in this design positive or negative?
___________________________
- Forward of
cg , what must the distance of the tail (dt )
be?
___________________________
- Is the canard
distance (dt) from the cg positive or negative?
___________________________
- What is the
total lift for this canard configuration?
___________________________
- How does the
total lift differ from the conventional design?
___________________________
- What type of
tail design did the Wright Brothers' Airplane have?
___________________________
- 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 has a wing distance (dw)
of 5 meters behind cg. What is the tail distance (dt)
behind cg?
- 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?
___________________________
- What is dt
now?
___________________________
- With no adjustment
by the pilot, what will the airplane do?
___________________________
- If wing lift
(W) remains constant, to what must the pilot adjust tail lift (T)
to maintain trimmed flight?
___________________________
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Related Pages:
Standards
Worksheet
Lesson Index
Aerodynamics Index
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