250 likes | 624 Views
Gliders and Flight. David Wagner. Part I: Wing Design. Basic Aircraft Geometry. Wing Reference Area. Chord (c). Wingspan (b). Aspect Ratio. The 4 Forces of Flight. Lift. Thrust. Drag. Weight. The Glider Technique: Gravity as Thrust. Velocity Vector (Where the Plane is going).
E N D
Gliders and Flight • David Wagner
Basic Aircraft Geometry Wing Reference Area Chord (c) Wingspan (b) Aspect Ratio
The 4 Forces of Flight Lift Thrust Drag Weight
The Glider Technique: Gravity as Thrust Velocity Vector (Where the Plane is going)
Optimizing Glider Flight & So,
Influence of Wingspan on Aspect Ratio Wing Reference Area: 0.5m 2
Effects of Wingspan and Aspect Ratio on Wing Design Ideal Conditions: - Small Chord - Large Wingspan
Stability and Control is the symbol for the centre of gravity of a body ALL motion of an airplane can be described as combinations of yaw, pitch and roll about theCG,
Moments: The Seesaw Problem Student 2 Weight: 300N 6m Student 1 Weight: 600N 6m Without putting Student 1 on a crash diet, how would we balance the seesaw?
Moments: The Seesaw Problem (cont’d) Student 1 Weight: 600N Student 2 Weight: 300N 3m 6m A “moment” is the tendency of a force to twist or rotate a body.
Applying Moments to Glider Stability and Egg Placement 0.5m 0.5m Pos’n forward of CG Pos’n aft of CG Pos’n on CG
Optimizing the Position of the Egg for Stability • Close to the CG to minimize impact • Extreme Cases: • Aft: Nose pitches up, aircraft stalls • Forward: Nose pitches down, aircraft nose dives