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.
seen hazard to smaller aircraft during cruise flight. This is a result of not only the strength of the. vortex but also the persistent nature of its flow. To fully comprehend the nature of lift-induced. wingtip vortex, the lift produced by a wing of an airplane should be closely examined. Air is actually a mixture of a number of gases, approximately 75 percent nitrogen, 16 percent oxygen, with the remaining 9 percent made up mainly of argon along with minute