# Helicopter Aerodynamics Quiz

A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward, and laterally. Coaxial helicopters, tiltrotor aircraft, and compound helicopters are all flying today.

The power available from a piston engine:
It is a right-handed orthogonal system. Its origin A is the center of the Earth. The ZI axis points North. The XI axis points towards the vernal equinox. The YI axis is perpendicular to both the axes. Its direction can be determined using the right-hand rule. Then the frame is said to be
The origin O is at an arbitrary location on the ground. The ZE axis points towards the ground. (It is perpendicular to it.) The XE axis is directed North. The YE axis can again be determined using the right-hand rule, Then the axis system is said to be
It is rotated by an angle &beta;a about the ZS axis. This is done, such that the Xa axis points in the direction of the relative wind vector Va. (So the Xa axis generally does not lie in the symmetry plane anymore.) The Za axis is still equation to the ZS axis. The Ya axis can now be found using the right-hand rule. Then the frame is said to be
The forward force produced by the power plant/propeller or rotor is known as
A rearward, retarding force caused by disruption of airflow by the wing, rotor, fuselage, and other protruding objects
The combined load of the aircraft itself, the crew, the fuel, and the cargo or baggage is called as
Which force is produced by the dynamic effect of the air acting on the airfoil, and acts perpendicular to the flightpath?
Bernoulli’s principle describes the relationship between
The length of the rotor blade from center of rotation to tip of the blade is given by
A straight line intersecting leading and trailing edges of the airfoil is known as
A line drawn halfway between the upper and lower surfaces of the airfoil is
The front edge of an airfoil is given by
Lift is generated by the blade is proportional to the
The angle between the chord line of a main or tail rotor blade and the rotor hub is called as
The change in blade incidence from the root to the outer blade is known as
The drag is present any time the helicopter is moving
through the air. This type of drag increases with airspeed so the drag is called
The angle between the airfoil chord line and resultant relative wind is called as
The spinning main rotor of a helicopter acts like a
The angle of attack of a blade is the
You're taking off, and you need to clear an obstacle using your best angle of climb. What speed are you flying?
The airflow over the main rotor will be in reverse direction
Which the helicopter in forward flight, parasite drag will cause the helicopter to
Which velocity of a rotor is hover is considerably influenced by near presence of the ground
Phase lag is due to the blades.
Any aircraft surface that deflects or interfaces with the smooth airflow around the airplane
Gravity is
The lift is
When you retract your flaps, immediately decrease
What climb rate will a single engine aircraft produced at its absolute ceiling?
What causes by ground effect?
Provides the pilot an indication of how the aircraft engine is performing
Tail rotor provides yaw movement
Is located on the vertical stabilizer. this surface deflects to the left and right with input from the rudder pedals
Tail rotor blades overcome the effects of torque and keeps the nose of the helicopter in line with the desired heading
Imaginary circle around the aircraft that includes the fuel servicing safety zone and extends at least 10 feet outboard of the aircraft wingtips, tail, and nose.
The most common landing gear has made up of
Blades move up and down independently of each other. type of system is found on a helicopter with three or more blades attached to the rotor head
Interconnects with the cockpit, has up to three aircrew member/gunner stations
Is the main by product of lift, is directly related to the angle of attack of the wing
Provides an indication of the engine lubrication system
Type of parasitic drag, any structure, which introduces into the relative wind, will create form drag
Percent of lift on a scale of 0(zero lift) to 1.0(stall)
Top and bottom of the fuselage
The total amount of drag on an aircraft is made up of many drag forces with three main
A typical helicopter has which type of engine
A piston-engine helicopter requires the engine to be warmed up prior to flight in order to:
What is the main function of semirigid rotor system
A piston engine that requires 100LL Avgas may use:
The cylinders of a piston engine are finned to:
The four strokes of the combustion cycle occur in the following order:
The volume of air available for combustion is directly controlled by the:
A typical piston engine ignition system consists of:
Chip detectors are found on the engine and transmission, they detect:
Oil is required in a piston engine:
When would a high viscosity oil be used?
When the fuel tanks are located above the engine:
Fuel is drawn into the venturi of the carburettor by:
An electrical or mechanical fuel pump is:
A fuel sample should be taken from the helicopter:
An alternator produces:
Illumination of the alternator warning light indicates that:
Typical electrically operated services would include:
As altitude increases, the mixture needs to be
Use of an excessively lean mixture may result in:
Foreign objects are prevented from entering the induction system by:
A helicopter alternator or generator has a rating of either:
It is rotated by an angle &alpha;a about the Yb axis. To find this &alpha;a, we must examine the relative wind vector Va. We can project this vector onto the plane of symmetry of the aircraft. This projection is then the direction of the XS axis. (The ZS axis still lies in the plane of symmetry. Also, the YS axis is still equal to the Yb axis.) So, the relative wind vector lies in the XSYS plane. This reference frame is particularly useful when analyzing flight dynamics
True airspeed is defined as the calibrated or rectified airspeed corrected for:
The airspeed indicator:
The pitot-static system encompasses the following instruments:
What is the minimum age for a student pilot license?
The attitude indicator uses:

The pilot's primary heading reference is:

A helicopter moves from hover to forward flight it enters a state called as
The altimeter:
The standard vertical speed indicator has an inherent lag, this is most noticeable:
The most common balance indicator uses a small ball in a U shaped tube, if the ball is deflected to the right of centre:
Contrary to the other systems, this is a lefthanded system. Its origin is a fixed point on the aircraft. The Xr axis points to the rear of the aircraft. The Yr axis points to the left. Finally, the Zr axis can be found using the left-hand rule. (It points upward.) This system is often used by the aircraft manufacturer, to denote the position of parts within the aircraft.
Position error describes the error attributed to

The magnetic compass experiences maximum turning errors when:

In a level turn is :
The cyclic flare due to
What type of check used to determine the sufficient power available to accomplish maneuver :
Is a hollow tube attached to gearboxes and separated in sections to provide strength and balance. deliver mechanical power from the gearboxes to the main rotor and tail rotor
Low frequency vibration would indicate a problem with:
Carburettor icing occurs when:
Parasite power is
Change the drive and reduce revolutions per minute(RPM). Main gearbox converts energy produced by the power plant into power for turning the main rotor head and the tail rotor head
Establishes the standards for personal/life support equipment
The origin of the reference frame is the center of gravity (CG) of the aircraft. The Xb axis lies in the symmetry plane of the aircraft and points forward. The Zb axis also lies in the symmetry plane, but points downwards. (It is perpendicular to the Xb axis.) The Yb axis can again be determined using the right-hand rule. Then the frame is said to be
Drag is:
The inner end of the blade and is the point that attaches to the hub
The length from leading edge to trailing edge; it is the characteristic longitudinal dimension of the airfoil section is known as
The downward flow of air through the rotor disk is given by
Which provides higher pitch angles at the root where velocity is low and lower pitch angles nearer the tip where velocity is higher?
At which part the mast is the center point and attaching point for the root of the blade?
The farthest outboard section of the rotor blade is known as