Gliders in Flight Stability for Straight and Level Flight.

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Gliders Flight Stability

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Presentation transcript:

Gliders in Flight Stability for Straight and Level Flight

Glider in Flight

Gliders Are Long Distance Fliers

Gaining Altitude Glider do not have an engine Use rising air to gain altitude

Balsa Glider Flight Straight and Level = Maximum Distance

Tree axis of movement

Movement in Yaw

Movement in Roll

Movement in Pitch

Static Stability

Dynamic Stability

Lateral Stability: Roll High wing aircraft are naturally stabilizing

Lateral Stability: Dihedral

Why does dihedral work?

Weight Uniform Lift

Why does dihedral work? Weight Component of Weight Causing a Sideslip

Why does dihedral work? Induced Relative Wind Higher AOA Lower AOA Higher Lift Lower Lift Rolling Moment

Lateral Stability: Types of Dihedral No Dihedral Straight Dihedral Tip Dihedral Polyhedral

Movement in Yaw

Directional Stability: Keel Effect

Directional Stability: Weather Vaning

Directional Stability Moment Arms

Directional Stability

Movement in Pitch

Avoiding the Stalling

Weight and Balance Center of Lift Weight at Center of Gravity Balanced, but easy to shift… VERY nose heavy! VERY tail heavy!

Center of Gravity Range