What is the center of pressure?

What is the center of pressure?

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.

What is the purpose of a locator?

What is the purpose of a locator?

To notify the crew of the aircraft of a particular position on the IAP.

Locators have been largely replaced with Distance Measuring Equipment (DME), but they can sometimes be found associated with Outer or Middle Markers where they are referred to as Locator Outer Marker (LOM) or Locator Middle Marker (LMM).

Why do aircraft have leading edge devices?

Why do aircraft have leading edge devices?

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.

What is the range of a VOR?

What is the range of a VOR?

VOR stations are fairly short range: the signals are line of sight between transmitter and receiver and are useful for up to 200 miles.

Each station broadcasts a VHF radio composite signal including the navigation signal, station's identifier and voice, if so equipped.

Approach category speeds are defined by which formula?

Approach category speeds are defined by which formula?

This speed is defined to be equal to the greater of stall speed (Vso) multiplied by 1.3, or stall speed (Vs1g) multiplied by 1.23.

The landing configuration that is to be taken into consideration can be defined by either the operator or by the aeroplane manufacturer but is most commonly assigned by the manufacturer.

Are jet streams there all year round?

Are jet streams there all year round?

Yes.

There are permanent jet streams in the...

What’s the temperature at FL150 according to ISA?

What’s the temperature at FL150 according to ISA?

-15°C

because:

-2°C per 1000 feet gives -30°C.

ISA: 15°C at sea level - 30°C = -15°C at FL150

Explain the definition “critical engine”.

Explain the definition “critical engine”.

The critical engine of a multi-engine, fixed-wing propeller-driven aircraft is the one whose failure would result in the most adverse effects on the aircraft's handling and performance.

Due to the asymmetric blade effect (P-factor), the right-hand engine typically develops its resultant thrust vector at a greater lateral distance from the aircraft's C.G. than the left-hand engine.

The failure of the left-hand engine will result in a larger yaw effect via the operating right-hand engine, rather than vice-versa, and it is termed the Critical Engine. Since the operating right-hand engine produces a stronger yaw moment, the pilot will need to use larger control deflections in order to maintain aircraft control. Thus, the failure of the critical (left-hand) engine is less desirable than failure of the right-hand engine.

The operating right-hand engine will produce a more severe yaw towards the dead engine, thus making the failure of the left-hand engine critical.

Which way do jet streams travel?

Which way do jet streams travel?

From West to East

East to West (In Africa during the summer)

If turboprops are more efficient aircraft, why do they not climb that high?

If turboprops are more efficient aircraft, why do they not climb that high?

Jet engines are designed to achieve their best specific fuel consumption at high rpm, which can only be achieved at high altitudes where the air density is low.

Thrust produced will be low enough to equal the required cruising thrust. Also high altitude gives the best operating conditions for the airframe i.e. minimum drag during the cruise.

Turboprops need relatively dense air for the propellers to work efficiently and at high altitude the density would be too low.

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