506
P. Liu
Fig. 7.78 New concept blended wing body layout
Fig. 7.79 Fuselage of the SH-5
When the plane is flying, the horizontal tail produces a small negative lift,
the upward lift and the downward gravity are balanced with the negative lift,
and the total moment of the center of gravity is zero, so the plane can fly
smoothly without bowing.
When designing an aircraft, it is reasonable to match the relative position
and area of the horizontal tail. If the horizontal tail area is large, although
the arm is short (the fuselage is relatively short), the negative lift is large. On
the one hand, the large negative lift will reduce the wing lift too much so
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