Acquisition cost. Refers to the price (including the closing costs) to purchase another company or property. In the context of investments, refers to price plus brokerage commissions, of a security, or the sales charge applied to load funds.
The pressure imbalance that produces lift creates a problem at the wing tips. The higher-pressure air below a wing spills up over the wing tip into the area of lower-pressure air above. The wingâs forward motion spins this upward spill of air into a long spiral, like a small tornado, that trails off the wing tip. These wing tip vortices create a form of pressure drag called vortex drag. Vortices reduce the air pressure along the entire rear edge of the wing, which increases the pressure drag on the airplane. The energy required to produce a vortex comes at the expense of the forward motion of the airplane. Tilting the airplaneâs wings upward makes the vortices stronger and increases vortex drag. Vortices are especially strong during takeoff and landing, when an airplane is flying slowly with its wings tilted upward.
This total drag is a combination, or the sum of induced drag (as a result of lift produced by the wing) and parasite drag. Note that: when an aircraft increases speed, induced drag becomes less (due to a lower angle of attack) and parasite drag increases. Induced drag. This is drag as a result of generating lift by the aircraft. We as a pilot have some influence on induced drag by extending or retracting flaps and or slats. As an aircraft kit builder there is not much we can do about this (apart from redesigning large parts of the airplane). With higher speeds this form of drag reduces (lower AoA).