Extending flaps during the descent results in a smaller Best Glide Angle.

A tailwind component increases the Best Glide Angle for a given speed.

A higher mass allows for a higher speed while maintaining the same Best Glide Angle

A lower altitude allows for a higher speed while maintaining the same Best Glide Angle.

is the maximum drag speed.

is the point where Drag coefficient is a minimum

is the point where the Lift to Drag ratio is a minimum.

is the point where the Lift to Drag ratio is a maximum.

Headwind

Low mass.

Tailwind.

High mass.

Vy expressed as a TAS will decrease and excess power will decrease

 Vy expressed as a lAS will increase and excess power will decrease.

Vy expressed as a lAS will decrease and excess power will increase.

Vy expressed as a TAS will increase and excess power will decrease.

 (1) improve; (2) reduced.

(1) deteriorate; (2) reduced.

(1) deteriorate; (2) increased

 (1) improve; (2) increased.

2 380 ft

2940 ft

3 850 ft

3570ft