Ch 17 - Ground Effect

Question 1

When does ground effect impact the aircraft

Answer 1

1 wingspan off the floor

Closer to the surface has greater effect

Can become a problem within half a wingspan

Question 2

Cause of Ground Effect

Answer 2

Down wash sheet reduced

Effective AoA increases

Question 3

Entering ground effect

Answer 3

Induced angle decreases
Effective angle increases
Induced drag decreases 
Lift increases 
Stalling AoA decreases 
ASI under reads

You then float and balloon

Nose pitches down as force on tail plane reduces

Question 4

Leaving Ground effect

Answer 4

Induced drag increases (total drag increases)
Lift decreases
Stalling AoA increases
Nose pitches up (watch out for this)
ASI returns to the correct value