曝光台 注意防骗
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The permissible most forward center of gravity location is given by
Xcg*f = 0.4424 - (-30 -15.23215) 0~0~864
- 0.1167
~
The stick-free neutral pomt is given by
Chtr Cma
(dC.)_=(,C, ,x cf -..(i-/l.)
r _0.002)
---0.1424- - ;)( 00l0864)(1-0.3)
k -0.003) .
- -0.1021
Then,
NL = c8 - &Cj ),_
- 0.4021
H,{ = - &~. )_
-. 0.1021
Example 3.4
A light aircraft has a wing loading of 1450 N/m2, wing aspect ratio of 8, and
tail aspect ratio of 4. The aerodynamic center of the wing-fuselage combination
is at 0.24 mac from the wing leading edge. The static margin is -0.05. Using the
following data, determine the tab deflection to trim the stick force at a speed of
160 km/h in level fiight at sea level. What is the stick force gradient at this speed?
a,, -. a, = O.l/deg, croL.u, = /t - /w = 0, 8e = -2 deg, Vi = 0.6, e = 0.5a, r7t =
0.9, q". f = O.ICL, r = 0.5, Se - 1.85 m2,ce = 0.608 m, Chot--0.003ldeg, Ch&= '
- 0.006]deg, Ch.o = 0, Ch8, = -0.003/deg, and Gi :5.0 rad/m.
Solution. This aircraft is statically unstable because it has negative static
margin (Hn - -0.05). We have
1
8uim = --,,,.,(-. . +K2)
where
K"=-K, .C ~(:g )_
K' = ;:pK]
246 PERFORMANCE, STABILl-fY, DYNAMICS, AND CONTROL
and
K2 = Cho + Cha(aw.oL - iw + /,) + CM.e8eo .
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