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15 Cards in this Set
- Front
- Back
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The Reynolds Number
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The important similarity parameter for viscosity; Expresses the ratio of inertial; (resistant to change or motion) forces to viscous (heavy and gluey) forces. (the air wants to keep going over the wing-inertial, yet viscous force wants to get air molecules to stick to a/c wing.)
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Reynolds Number: high values(of the parameter indicate that viscous forces are
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that viscous forces are small and the flow is essentially friction free.
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Reynolds Number: low values (on the order of 1 hundred) of the parameter indicate that viscous forces......
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must be considered.
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the tailwheel undercarriage
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dominated aircraft design for the first four decades of flight and is still widely used on many small piston engine planes.
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The Taildragger arrangement consist of
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two main gear units located near the Cg that supports the majority of the plane's weight.
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Tailwheel advantages
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simple
lightweight maneuverable propeller clearance |
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Tailwheel Disadvantages
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Design is inherently unstable because the lane's CG is located behind the two main gear
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Ground Loop is most common in which type of a/c?
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tailwheel a/c
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Define a Spin
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aggravated stall (wing not producing lift) that results in auto-rotation (combination of yaw and roll progressively gets worse do to stall wings)
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if an a/c is not stalled, it will not
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spin
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all spins
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have to stall a/c and produce yaw
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pilot induced oscillations
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gust of wind, raised nose (pilot) was done sharply and nose pitched up too much, put nose down elevator, they do it to much, pull it back etc... pilot is out of sinc with what a/c is doing; fighting a/c attitude change; typically happens more in pitch
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Design considerations
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aerodynamic balance
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aerodynamic balance
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the hinge of the control surface is set so that when its surface is deflected, the air that strikes the surface in front of the hinge creates a pressure distribution hence a force, that helps turn the surface even more.
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Mass balance-- to illiminate Flutter
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weight, moves CG on control surfaces at or infront of hinge
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