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--- courses:207a:aerodynamics [2019/02/20 15:02]
evan [Aircraft Stability, Maneuverability, and Controllability]
+++ courses:207a:aerodynamics [2019/02/20 17:48] (current)
evan [Forces During Turns]
@@ Line 20: / Line 20: @@
 {{ :courses:207a:ld_chart_2.jpg?direct&200 |}}
+{{ :courses:207a:vg_diagram.jpg?nolink&400 |}}
 ==== Drag ====
@@ Line 31: / Line 31: @@
 Skin Friction Drag -
-===== Forces During Turns =====
+==== Lift/Drag Ratios ====
+The lift-to-drag ratio is the lift required for level flight (weight) divided by the drag produced at the airspeed and angle of attack required to produce that lift. The L/D ratio for a particular angle of attack is equal to the power-off glide ratio.
+{{ :courses:207a:faa-com-fig3.jpg?nolink&400 |}}
+Problem: Refer to FAA Figure 3. If an airplane glides at an angle of attack of 10°, how much altitude will it lose in 1 mile?
+Solution:
+  - Enter the L/D chart from the bottom at a 10° angle of attack.
+  - Proceed vertically upward until intersecting the L/D curve.
+  - Follow the horizontal reference lines to the right to the point of intersection with the glide ratio scale. L/D at 10° angle of attack = 11.0.
+  - 5,280 feet ÷ 11 = 480 foot altitude loss.
+L/DMAX occurs at the angle of attack that gives maximum glide performance and maximum range in a propeller driven aircraft. At an airspeed slower (or at a higher angle of attack) than needed for
+L/DMAX, the glide distance will be reduced due to the increase in induced drag.
+===== Forces During Turns =====
+{{ :courses:207a:turn_load_factors.jpg?400 |}}
 ===== Forces During Climbs/Descents =====
@@ Line 71: / Line 87: @@
+{{ :courses:207a:effects_of_cg.jpg?nolink&600 |}}

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