An airfoil is subjected to the flow with temperature of 288.16K and flow is ideal. Maximum thickness = last two digits in percent of chord=12% of chord = 0.12*1 = 0.12m.ġ2.
#Airfoil cross section series
What should be the maximum thickness of this airfoil?Ĭlarification: NACA-4 digit series is used to define certain airfoil characteristics. It is operating with flow velocity of 900m/s with chord of 1m. Hence, location of aerodynamic center is = 25% of chord = 0.25*10 = 2.5m from leading edge.ġ1. Given velocity is less than the sonic speed. Find location of aerodynamic centre from leading edge if, chord is 10m and airfoil has flow velocity of 0.2 M.Ĭlarification: Given, velocity = 0.2M = 0.2*340 = 68m/s Here, airfoil is mentioned which is 2D shape.ġ0. If an airfoil has lift of 200 N at 10° AOA, then what is induced drag produced by airfoil at that AOA?Ĭlarification: Given, Lift=200N, AOA = 10° Pressure difference = Lift/Area of airfoilĩ. If chord is c m then, what will be the pressure difference across the airfoil?įlow velocity V=350m/s, Lift L=21N, AOA = 0.008rad The lift produced by the airfoil is 21 N at 0.008 rad AOA. A symmetric airfoil is operating with flow velocity of 350m/s. An airfoil is able to provide much smoother flow than non-streamlined body.Ĩ. Vortex is a phenomena, not the type of an airfoil.Ĭlarification: Streamline shape is that shape which gives streamlined flow. Which of the following is not type of an airfoil?Ĭlarification: Symmetric airfoils have symmetric curvature at both side. Determine lift produced by this aerofoil.Ĭlarification: Lift is an upward force produced by pressure difference.įor symmetric airfoil at 0° AOA pressure will be same as upper and lower surface.Ħ. An aerofoil is operating with flow velocity of 100m/s. An airfoil is 2D shape which will have less drag as compare to sphere for all similar conditions.ĥ. Drag produced by sphere will be more due to increased friction and 3D effects. In general, crucial performance parameters are affected by airfoil selection.Ī) Lift produced by an airfoil is always equal to weightī) Drag by sphere is more than the drag produced by an airfoil for similar conditionsĬ) Drag by sphere is less than that of produced by an airfoil for similar conditionsĭ) Drag by sphere is equal to the drag produced by an airfoil for similar conditionsĬlarification: Lift produced is not always same as weight. Airfoil will affect lift, drag, take-off characteristics etc. Aerofoil affects the performance parameters of aircraft.Ĭlarification: Airfoil is cross-section of the wing. Camber and chord are parameters of an airfoil.ģ. Engine inlets are typically circular in cross-sections. The cross-sectional shape of wing is called _Ĭlarification: Wings are designed with airfoil cross-section. Leading edge in contrast, is foremost part of an airfoil.Ģ. It is most after portion of the airfoil as shown in the diagram. The trailing edge of an airfoil is end point of the airfoil. The parameter marked by ’?’ in the diagram is _Ĭlarification: The diagram is showing typical airfoil shape. Wingsail - A wingsail is a form of marine propulsion similar to conventional sails.Aircraft Design Multiple Choice Questions on “Airfoil Selection-1”.ġ. P4M Mercator - Infobox Aircraft name= P4M Mercator caption= United States Navy P4M 1 type= Patrol bomber national origin = United States manufacturer= Martin designer= first flight= 20 October 1946 introduced= 1950 retired= 1960 status= Retired primary user=… … WikipediaĬonvair XF-92 - XF 92 A photo of the Convair XF 92 in flight Role interceptor aircraft Manufacturer … Wikipedia CharacteristicsSince human beings are lacking in the natural weapons… … Wikipedia Hunting weapon - Hunting weapons are weapons designed or used primarily for hunting game animals for food or sport, as distinct from defensive weapons or weapons used primarily in warfare. Northrop P-61 Black Widow - P 61 Black Widow A P 61A 1NO of 419th Night Fighter Squadron Role Night fighter … Wikipedia P-61 Black Widow - Infobox Aircraft name = P 61 Black Widow caption = A P 61A 1NO of 419th Night Fighter Squadron type = Night fighter national origin= United States manufacturer = Northrop designer = first flight = introduced = 1944 retired = 1952… … Wikipedia thickness 6: Upper surface 7: Trailing edge 8: Camber mean line 9: Lower surface … Wikipedia NACA airfoil - Profile geometry – 1: Zero lift line 2: Leading edge 3: Nose circle 4: Camber 5: Max. An airfoil shaped body moved through a fluid produces a force perpendicular to… … Wikipedia Airfoil - An airfoil (in American English) or aerofoil (in British English) is the shape of a wing or blade (of a propeller, rotor or turbine) or sail as seen in cross section.
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