courses:207a:aerodynamics
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courses:207a:aerodynamics [2019/02/20 14:58] evan |
courses:207a:aerodynamics [2019/02/20 17:48] (current) evan [Forces During Turns] |
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| {{ :courses:207a:ld_chart_2.jpg?direct&200 |}} | {{ :courses:207a:ld_chart_2.jpg?direct&200 |}} | ||
| + | {{ :courses:207a:vg_diagram.jpg?nolink&400 |}} | ||
| ==== Drag ==== | ==== Drag ==== | ||
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| Skin Friction Drag - | 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. | ||
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| + | {{ :courses:207a:faa-com-fig3.jpg?nolink&400 |}} | ||
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| + | 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? | ||
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| + | 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. | ||
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| + | 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 ===== | ===== Forces During Climbs/Descents ===== | ||
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| ===== Adverse Yaw ===== | ===== Adverse Yaw ===== | ||
| + | {{ :courses:207a:differential-ailerons.jpg?nolink&400 |}} | ||
| ===== Aircraft Stability, Maneuverability, and Controllability ===== | ===== Aircraft Stability, Maneuverability, and Controllability ===== | ||
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| + | https://www.boldmethod.com/learn-to-fly/aerodynamics/3-types-of-static-and-dynamic-stability-in-aircraft/ | ||
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| + | Manoeuvrability: What the aircraft can do. | ||
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| + | Controllability: How well you are able to control what it actually does. | ||
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| + | An unstable aircraft can be very maneuverable, but if it is unstable to the point of being out of control most of the time, the controllability is poor. You can't employ the maneuverability to do what you want to achieve as you it is not controllable | ||
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| + | {{ :courses:207a:effects_of_cg.jpg?nolink&600 |}} | ||
courses/207a/aerodynamics.1550674719.txt.gz · Last modified: 2019/02/20 14:58 by evan
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