An aerofoil when placed in a flow will (normally) cause said flow to accelerate over the aerofoil and decelerate below it.

This will cause a pressure differential between the upper and lower surface of the aerofoil, and the resultant force will be applied at the center of pressure.

662 kts

Local speed of sound = 39 x √(Temperature in Kelvin)

15°C in Kelvin is (15 + 273) = 288

So the local speed of sound = 39 x √288 = 662 kts

1kg = 2.2lbs

There are 2 types of leading edge devices:

-Slats. Slats are movable surfaces on the leading edge of the wing which when deployed, allow the wing to operate at a higher angle of attack, by delaying separation in the wing upper surface.

-Leading edge flaps (Krueger). Leading edge flaps are hinged on the leading edge of the wing and extend forward and down when deployed. they provide similar benefits as trailing edge flaps, by increasing wing surface area and camber.

Alternate air is....

Windshear is a change of wind speed and/or direction from place to place, including updraughts and down draughts.

It is ussualy characterized by a strong change over a short distance. Windshear can effect the flight path and airspeed and can be hazardous.

They provide at least 1000ft clearance over obstacles within 25NM of the homing facility.

A swept wing makes the velocity vector normal to the leading edge a shorter distance than the chordwise resultant.

A free turbine is a turbine that is not directly connected to the compressor. This allows the compressor to rotate at a different speed than the turbine. Since the turbine speed is coupled with the propeller, this allows for the propeller to be maintained at a constant ideal speed.

Another advantage is that free turbine engines can be designed to be more compact than their single shaft counterparts

To increase the strength of the surfaces.

The same strategy is employed by plastic water bottles, by adding ridges to a surface you increase it's structural rigidity