Explain V1, V2, VR, VMCA and VMCG

Explain V1, V2, VR, VMCA and VMCG

V1 is the decision speed (sometimes referred to as critical engine speed or critical engine failure speed) by which any decision to reject a takeoff must be made.

V2 is the takeoff safety speed which must be attained at the 35 ft height at the end of the required runway distance. This is essentially the best one-engine inoperative angle of climb speed for the airplane and is a minimum speed for flight in that condition until at least 400 ft above the ground. V2 shall be at least 1.1 times VMCA, and no less than 1.2 times VS.

Vr is defined as the speed at which the rotation of the aircraft should be initiated to takeoff attitude.

VMCA is the minimum control speed in the air and is defined as the minimum speed, whilst in the air, that directional control can be maintained with one engine inoperative (critical engine on two engine aerolanes), operating engine(s) at takeoff power and a maximum of 5 degrees of bank towards the good engine(s).

VMCG is the minimum control speed on the ground and is defined as the minimum speed, whilst on the ground, that directional control can be maintained, using only aerodynamic controls, with one engine inoperative (critical engine on two engine airplanes) and takeoff power applied on the other engine(s).

What is the difference between angle of attack and angle of incidence?

What is the difference between angle of attack and angle of incidence?

Angle of attack is the angle between the chord of the aerofoil and the relative airflow.

Angle of incidence is the angle between the chord and the aircrafts longitudinal datum.

Is carb heat an electrical system?

Is carb heat an electrical system?

No. Carburetor heat uses exhaust air to heat air going into the carburetor. No electrics are involved.

Where is thrust produced in a gas turbine engine?

Where is thrust produced in a gas turbine engine?

Mostly in the fan, but also from the exhaust nozzle duct.

Why would someone fly a Rhumb Line track?

Why would someone fly a Rhumb Line track?

  • If no IRS/INS/GPS was available, it’s easier to fly a constant heading (but you will need to apply variation).

  • If flying over short distances (as done during your training) the error introduced by flying a rhumb line is insi

What is the difference between a supercharger and a turbocharger?

What is the difference between a supercharger and a turbocharger?

A turbo charger is externally driven by exhaust back pressure turning a turbine which in turn drives a compressor in the induction manifold to increase the air pressure (constant volume, higher pressure) and is controlled by waste gate.

A supercharger is internally driven by the propellor shaft to compress mixture and is controlled by RPM.

Name the different aircraft categories, speeds and on which speed these categories are based.

Name the different aircraft categories, speeds and on which speed these categories are based.

Aircraft categories are based on Vat (in knots):

A <91

B 91-120

C 121-140

D 141-165

E 166 - 210

What wings does the Boeing 737-800 use?

What wings does the Boeing 737-800 use?

Swept back wings

The tailplane of a Seneca has an elevator and a trim tab, what does a Boeing 737 have?

The tailplane of a Seneca has an elevator and a trim tab, what does a Boeing 737 have?

The Boeing 737 has an all moving horizontal stabilizer.

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.

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