The Decimal Numbering System Engineering Essay

Rotor is the chief portion of the chopper with which the needed 360 grade on the topographic point, remain airborne with no directional motion, velocity, Range, Lift, operational handiness etc demands can be attained.

Rotors are of two types ‘ chief rotor and tail rotor. The chief rotor consists of 2 or more blades. The velocity, etc of the choppers is achieved by the figure of blades it has and length of the blade and these are connected to cardinal rotor head/hub assembly.

The hub assembly rests on the swash home base which is primary constituent of the chopper. The swash home base consists of two discs one revolving and non-revolving which is mounted on the top of the chopper and this swash home base is attached/connected to the cockpit which has two sticks Corporate lever, Cyclic stick and Tail rotor pedals.

The collective lever which is on the left side of the pilots seat which helps the chopper to travel up or down by traveling the swash home base up and down and these motions is attained by lifting the lever or take downing the lever

The cyclic lever which acts as joy stick is between the pilots articulatio genuss helps to alter the angle of both the blades at the same time which helps the chopper to travel in all waies other than up and down and is attained by leaning the swash home base lever.

Tail rotor pedals which are used to command the rotary motion of the chopper.

The swash home base is rested on the mast and transmittal which is connected to the engine through thrust shaft and the tail rotor is attached to 45degree cogwheel box, thrust shaft which is attached to the engine. The engine is mounted on the engine saddle horse and is covered with hood.

Hood is nil but metal portion which is used to cut down drag decrease and engine chilling and air consumption.

Rotors: –

The rotor can hold blades runing from 2 to 6. These blades are connected to the blade clasps with keeping bolts and these are connected to the hub and this hub is positioned on the terminal of the mast which is bolted with Jesus nut. And the hub and blade clasp together are controlled by control tubing which is connected the interior ring of the swash home base and these controlled tubing aid the blades to alter the angle of the blades. These control tubing is connected to the blade clasp with pitch alteration horn. The rotor blade has a taking border which is frontward confronting border of the rotor blade and tracking border which is confronting border of the rotor blade and chord which is the distance from taking border to the draging border of the rotor blade.

The parts of rotor are


Blade Grips


Control tubings

Pitch Change Horn

Jesus Nut

Retnetion Thunderbolts


The different types of rotor systems are mentioned below

Fully articulated: –

In this rotor system, each rotor blade is attached to the rotor hub through a series of flexible joints, which allow the blade to travel independently of the others. These rotor systems normally have three or more blades. The blades are allowed to roll, feather, and lead or slowdown independently of each other. The horizontal flexible joint, called the flutter flexible joint, allows the blade to up and down. This motion is called the flutter and is designed to counterbalance for asymmetry of lift. The flapping flexible joint may be located at changing distance from the rotor hub, and there may be more than one flexible joint.

Vertical flexible joint, called the lead-lag or retarding force flexible joint, allows the blade to travel back and Forth. This motion is called lead-lag, dragging, or runing. Dampers are normally used to forestall extra back and forth motion around the retarding force flexible joint. The intent of the retarding force flexible joint and dampers is to counterbalance for the acceleration and slowing caused by coriolis consequence. Each blade can besides be feathered that is rotated its spanwise axis. Feathering the blade means altering the pitch angle of the blade. By altering the pitch angle of the blades the push and way of the chief rotor phonograph record can be controlled.

Rigid/ hingeless: –

They are used to convey simpleness to the choppers. In a stiff rotor system the blades, hub, and mast are stiff with regard to each other. There are no flexible joints to rolling or lead/drag, but they can be feathering. The tonss are absorbed by flexing instead than flexible joints as in to the full articulated. This is the ground it has less lag due to less oscillation.

Semi rigid: –

It produces two different motions, rolling and feathering. This System is usually composed of two blades, which are stiffly attached to the rotor hub. The hub is so attached to the rotor mast by trunnion bearing or seesawing flexible joint and is free to lean with regard to the chief rotor shaft. This allows the blades to see-saw or flap together. One blade flaps up and the other flaps down. There are seesawing flexible joint and feathering flexible joint which accomplish the Centre of gravitation of the both blades so that the blade does non speed up as it flap up and slow as it flaps down and feathering is accomplished the later one which changes the pitch angle of the blade.

These semi-regid rotors are vulnerable to a status known as mast Bumping, this is usually encountered during low-G manoeuvres and can do the rotor flap stops to shear the mast.

Anti-torque rotor: –

Tail rotor: –

It is a smaller rotor mounted at the terminal of tail of a traditional single-rotor chopper. It rotates vertically or near-vertically and it is positioned in such a manner that Centre of gravitation allow it to develop thrust antonym to the chief rotor rotary motion to equilibrate the torsion created by the chief rotor. They require merely corporate alterations in pitch to change push and the pitch is adjustable by the anti-torque pedals which besides provide the way required for the chopper.

Tip jet rotor: –

It is used for individual chief rotor constellation where the chief rotor is non driven by the mast but from noses on the rotor blade tips, which are either pressurized from a fuselage-mounted gas turbine or have their ain pushers ( fanjet, atherodyde or projectile pushers ) .

Double rotors: –

It consists of brace or more of big horizontal rotors turning in opposite waies to antagonize the effects of torsion on the aircraft without trusting on an antitorque tail rotor. It helps to use the power which is applied on the tail rotor to use the same power on the chief rotor which increases the aircraft lifting capacity.

They are four types of double rotors, they are: –

( a ) Tandem: –

Rotors are two rotors with one mounted behind the other. The pitch attitude alterations to speed up and slow the chopper and the procedure are called differential corporate pitch. To flip forward and accelerate, the rear rotor additions corporate pitch, raising the tail and the front rotor decreases corporate, at the same time dunking the olfactory organ. To flip upward while slowing or traveling back the forepart rotor increases the corporate pitch to the rise the nose and rear rotor decreases corporate pitch to take down the tail. To swivel right, the forepart rotor jousts right and the rear rotor to go forth and to swivel left the front rotor jousts left and the rear rotor jousts right.

( B ) Coaxial: –

Rotors are two rotors that are mounted one above the other with the same shaft and turning in opposite way. The advantage of the coaxal rotor is that in forward flight, the lift provided by the progressing halves of each rotor compensated for withdrawing half of the other. There is an increases mechanical complexness of rotor system and swashplates

( degree Celsius ) Intermeshing: –

Rotors are two rotors that are mounted near to each other at a sufficient angle to let the rotor to intermesh over the top of the aircraft. They have high stableness and powerful lifting capableness.

( vitamin D ) Transverse: –

Pair of the rotors is mounted at each terminal of wing-type constructions or outriggers, perpendicular to the organic structure of the aircraft. They besides use corporate pitch and alter the axial rotation attitude of the rotorcraft.

( Viii ) Notor: -No Tail Rotor

Swash home bases: –

It is a device that translated engine power via the choppers controls and levers into gesture of the chief rotor blades. And these bids are transmitted from non-rotating fuselage to the revolving rotor hub and chief blades.

The stationary outer ring is mounted on the chief rotor mast and is connected to the cyclic and corporate controls by a series of pushrods.

The rotating inner ring is mounted to the stationary outer ring by agencies of bearings and is allowed to revolve with the chief rotor mast. An anti-rotation nexus prevents the interior ring to from revolving independently of the blades, in response apply torsion to the actuators. The outer pealing typically has an anti-rotation skidder to forestall it from revolving. So this helps both the ring or swash home bases to move as one unit to execute their actions. The revolving swash is connected to the pitch horns by pitch links.

The alternate mechanics to the stationary outer ring are the hexapod and the cosmopolitan articulation.

Partss of the swash home base are

Non-rotating outer ring

Turning interior ring

Ball joint

Control ( Pitch ) forestalling turning of outer ring

Control ( axial rotation )

Linkages to the rotor blade

Linkages that make the interior ring bend

Pitch: –

Cockpit: –

It consists of the four flight controls and other electronic instruments.

They are

( I ) The cyclic: –

Cyclic controls are used to alter choppers way. As the stick is leaned over in any way, so the angle of the home base alterations really somewhat. This alteration of angle corresponds straight to what is go oning to the rotor phonograph record at the same clip. I.e. the side of the home base that is higher represents the side of the rotor phonograph record bring forthing more lift.

( two ) The collective: –

To command the corporate pitch of the chief rotor blades, the full swash home bases must be moved up or down along its axis without altering the orientation of the cyclic controls. Conventionally, the full swash home base is moved along the chief shaft by a separate actuator. Now yearss the mutualist actuators that can each travel the full swash home base that is nil but corporate pitch commixture.

Actuator: –

( three ) The anti-torque pedals: –

Increasing the pitch angle of the tail rotor blades will increase the push, which in bend will force the chopper unit of ammunition in the same way as the chief rotor blades. Decreasing the pitch angle decreases the sum of push and so the natural torsion takes over, allowing the chopper rotate in the opposite way to the chief rotors.

( four ) The accelerator: –

It is a twist-grip on the terminal of the corporate lever and is linked straight to the motion of the lever so that engine RPM is ever correct at any given corporate scene. Because the cyclic and corporate pitch control determines the motion of the chopper, the engine RPM does non necessitate to be adjusted. ( Which is to done in aeroplane engine ) ? So during normal winging changeless engine velocity is maintained and the pilot merely needs to ticket tune the throttle scenes when necessary.

There is nevertheless, a direct correlativity between engine power and swerve control in a chopper. For illustration faster whirling chief rotor blades generate more torsion, so greater pitch is needed in the tail rotor blades to bring forth more push.

( V ) Instrument panels consists of

( I ) Landing visible radiations

( a ) Skid visible radiation: –

It is attached to the left forward crosstube and it is adjusted from the lift of the land. The on-off switch is located on pilots window sill.

( B ) Search visible radiation: –

It is retractable pilot controlled hunt visible radiation which is either a white or IR light depending on the mission demand and the switch is of 3-position switch ( ON-OFF-STOW ) and it has control switch ( “ Chinese hat ” ) which extends, retracts and moves light left or right

( two ) Warning visible radiations

( a ) Clasp

( B ) Mr temp

( degree Celsius ) Mr bit

( vitamin D ) Starter on

( vitamin E ) Tail rotor bit

( degree Fahrenheit ) Low fuel

( g ) Low revolutions per minute

( three ) Flight, safety Instruments: –

( a ) Vertical Speed Indicator: –

This is a force per unit area sensitive instrument, which indicates the rate at which the chopper is mounting or falling in pess per minute.

( B ) Air Speed Indicator: –

This instrument indicates the velocity of the chopper through the air in which it is winging. It relates merely indirectly to the velocity of the chopper over the land. It may bespeak velocity in stat mis per hour/knots.

( degree Celsius ) Outside Air Temperature Guage: –

This is non a flight instrument, but is a flight safety instrument. As it gives the information of frosting conditions to the pilot. It registers air temperature both in Celsius and Fahrenheit.

( vitamin D ) Altimeter: –

This is pressure sensitive instrument which shows the height at which the chopper is winging. The customary process is to put the instrument so that it indicates height above the sea degree. When used this manner the indicant on the altimeter will be that of the lift of the airdrome when the chopper is on the land.

( vitamin E ) Machmeter: –

It shows the ratio of true airspeed in relation to the velocity of the sound

( degree Fahrenheit ) Course Deviation Indicator: –

It is avionics instrument used to find the sidelong place in relation to a path, which can be provided by an instrument set downing system or VOR.

It can be integrated with the heading index in horizontal state of affairs index.

( g ) Radio Magnetic Indicator: –

It consists of one acerate leaf ; a typical RMI has two, twosome to different ADF receiving systems, leting for place repairing utilizing one instrument. ADF is nil but automatic way finder which is coupled with RMI and provides bearing for a tuned Non-derectional beacon.

( H ) Magnetic Compass: –

This is the basic mention for heading information. The compass rectification card indicates the corrected header to maneuver to let for compass divergence

( I ) Turn cordinator and slip index: –

The operation of it is same as the bend and bank index.

( J ) Heading Index: –

It is besides called gyroscopic instrument, it is used to supply stable directional mention, and unlike the compass is comparatively free from mistakes during bends, acceleration, and slowing in normal flight manoeuvers. It does non hold any magnetic qualities therefore it must be set sporadically with mention to the magnetic compass.

( K ) Attitude Indicator: –

This is besides gyroscopic instrument. It provides the pilot with an unreal skyline, which together with a illumination aircraft superimposed on its face enables the pilot to find the aircrafts attitude relation to the existent skyline.

( cubic decimeter ) Turn and Bank Indicator: –

The needle part of this instrument indicates whether the chopper is turning, together with the way and rate of bend. The ball part of the instrument is basically a mention for coordination of controls. In co-ordinate flight the ball will be centered in its curving glass tubing.

( m ) Cockpit Indicator: –

These are driven by a gyrosyn compass system

Fixed-card instruments: –

Traveling card indexs: –

Horizontal state of affairs index: –

Gyrosyn compass: –

It has a remotely located unit feeling the earths magnetic field. It incorporates a gyroscope to supply stableness. Electrical power is required for its operation.

Basic constituents are

Distant compass sender: –

It is pendulously suspended within a certain bowl and maintains a horizontal plane within a pitch attitude of +30 grade. . It senses the earth magnetic field and reduces the aircraft magnetic perturbations.

Gyroscope: –

The rule of rigidness in infinite is applied to retain a fixed place during any aircraft turns. Turning gesture of the aircraft about the gyro is so electrically relayed to the header index.

Erection mechanism: –

An hard-on torsion motor is used to maintain the gyro spin axis in a horizontal plane

Amplifier: –

It is the coordination and distribution centre for all system electrical signals. Remote compass sender signals arc stage detected to decide for the 180-degree ambiguity and discharge sent to the break one’s backing torsion motor to maintain the gyro spins axis aligned with magnetic north-south.

( four ) Engine Instruments

( a ) Double Tachometer: –

This instrument indicates the figure of revolutions per minute ( RPM ) that of both engine ( ERPM ) and the rotor blades ( RRPM ) are doing. A detached acerate leaf is provided for each. In powered flight the acerate leafs are combined or joined. In autoratation the acerate leafs are split.

( B ) Manifold Guage: –

This instrument is calibrated in inches of quicksilver and indicated the force per unit area in the consumption manifold of the engine. Nothing but he sum of work the engine is making the higher the force per unit area the more work the engine is making and frailty versa. This is merely positioned on piston-engine choppers

( degree Celsius ) Torque metre: –

This is same as the multiplex force per unit area guage and it is positioned on turbine-engine choppers.

VOR: –

It stands for Very High Frequency omni-derectional scope station/navigation system. The vor consists of two parts the land station which send the wireless signals and the receiving system in the aircraft with index which shows way of the chopper its moving. Main end is to demo the pilot on which spoke, of the wheel, he is winging and which way.

Gear boxes

Pressure from the combined hydraulic systems powers the flap thrust motor and gear box assembly. And these semi-independent flap and slat systems rise and lower utilizing hydraulic motors, drive units, torsion tubings, and screw jack-type actuators.

If the combined system fails, a hydraulic brake locks the hydraulic motor, and an exigency electric motor provides continued operation. Flap thrust gear boxs, through a series of torque tubings and countervail gear boxs, drive all eight flap actuators. The flap actuators drive the passenger car and attaching flaps out and down.

The parts are

Actuators: –

. It is used to use a force. It is a mechanical device that takes energy, normally created by air, electricity or liquid and converts into gesture. The gesture can be barricading, clamping and chuck outing.

Types of actuators

Linear actuators: –

They have an end product rod that provides additive gesture via a motor driven ball prison guard, lead prison guard, or ACME screw assembly.

Hydraulic Rotary actuators: –

They use a pressurized, incompressible fluid to revolve mechanical constituents.

Hydraulic additive actuators: –

They use a cylinder and hydraulic fluid for motor force. The force applied at one point is transitted to another point utilizing an incompressible fluid.

Electric rotary actuators: –

They drive constituents rotationally via electromagnetic power from a motor. They typically provide control and indexing capablenesss to let multiple places stops along shots.

Pneumatic rotary actuators: –

They use pressurized air to revolve mechanical constituents.

Types of pneumatic actuators are

Individual rack-and-pinion: –

They drive racks a individual rack that rotates the pinion.

Double/four Piston rack- and – pinion: –

They drive racks on both sides of the pinion.

Screw jack-type actuators: –

Hydraulic cylinders: –

They are actuation devices that utilize pressurized hydraulic fluid to bring forth additive gesture and force.

Electrohydraulic cylinders: –

These are propulsion devices that use pressurized hydraulic fluid to bring forth additive gesture and force. These are combination of unstable power constituents, valves, and electronic controls such as a transducer to supply rod place.

Valves actuators: –

These are mounted on valves which, in response to a signal, automatically travel to a desired place utilizing an outside power beginning.

Hydraulic valves: –

It transfers the flow and force per unit area of hydraulic fluid in hydraulic power systems.

Types of hydraulic valves are

Angle: -admit media at an angle and license upper limit flow

Ball: – They provide tight shut-off and dependable control

Block: -They use little port to depressurise the infinite between

the recess and mercantile establishment.

Bleed: – Lapp as block valves

Check: – They prevent flow reversal

Control: – They modify unstable flow.

Cartridge: –

Directional: – They steer process media through selected


Drain: – They are used to take excess fluid from a system or container

Acerate leaf: – They have a slender, tapered point at the terminal of a valve root.

Poppet: -They unfastened and close ports with a sealing device that includes a disc, cone, or sphere.

Pressure alleviation: – They remove extra upstream force per unit area

Safety: – They contain a thermic detection constituent that opens or closes outlet force per unit area.

Shutoff: -They close a line to halt flow when a pre-set status occurs.


Bobbin: – They are actuated by a rotary or piston-like bobbin that slides back and Forth to cover and uncover ports in lodging

Stack: -They are created to make a valve block.

Pneumatic valves: –

These actuators adjust valve place by change overing air force per unit area into additive or rotary gesture.

Electric valve actuators: –

These valves which move automatically in response to a signal to desired place utilizing an outside power beginning.

Hydraulic hosiery: –

It is specifically designed to convey hydraulic fluid to or among hydraulic constituents, valves, actuators, and tools.

There are assorted building options for hydraulic hose include reinforced, coiled, corrugated/convoluted, articulated, and multi-element.

Hydraulic oils and transmittal fluids: –

These are used to convey power in hydraulic equipment and power transmittal applications.

Hydraulic fluids transmit power/pressure genenerated by a pump through hydraulic lines to a cylinder or actuator.

Transmission fluids lubricate gear box assemblies where power is transmitted from an engine to a thrust axle.

Torque tubings: –

It uses C fibre tubing or wire thrust mounted on the interior of the tail roar with gear sets on each terminal to drive the tail rotor. Torque tubes generate less retarding force on the motor than a belt and are more lasting in normal operation. A torsion tubing system is less tolerant of roar stikes or anything that stops the tail rotor from whirling, and tends to deprive cogwheels in a clang.

Drive units: –

Flying flaps: –

They are movable portion of the wing, usually hinged to draging border of the wings. As they are extended the velocity of the aircraft is reduced and can wing at lower velocities, it besides helps in lessening in aircraft pitch angle. This provides the pilot greater position over the olfactory organ of the aircraft and allows a better position for landing.

Types of flaps are

Krueger/Hinged: –

It is on the taking border besides called as sag


Rotates on a simple flexible joint

Split: –

There are two separate surfaces upper and lower. The upper moves slightly/immobile and the lower operates like a field flap.

Gurney: –

It is a little level check projecting from the draging border of a wing. It is set at a right angle to the force per unit area side surface of the aerofoil, and undertakings of the wing chord. It operates by increasing the force per unit area on one side and diminishing the other side.

Dent: –

It rotates rearward and downwards about an fanciful axis below the wing, increases flying country and chord without set uping trim. It may be of cylindrical or conelike airfoil subdivision.

Fowler: –

It slides backwards before hinging downwards, thereby increasing both camber and chord, making a larger flying surface better tuned for lower velocities, it besides provides some slot consequence.

Youngman: –

It moves bodily down before traveling aft and rotating.

Slotted: –

There is a gap/slot between the flap and the wing enables high force per unit area air flow below the wing to re-energize the boundary bed over the flap. This helps the air flow to remain attached to the flap, detaining the stall.

Blown: –

They blow engine air over the upper surfaces of the flap at certain angles to better lift features.

45Degree/Intermediate Gear box: –

It is situated between the tail roar and five. Transportations power up the perpendicular five to the 90 grade gear box.

90Degree/Tail Gear box: –

It is situated near the tail. It gets the power from the 45 grade gear box to the tailrotor.

Landing cogwheel: –

It consists two aluminium cross tubings and skids, to minimise skid wear the skid have steel skid places and fiberglass fairings can be attached to the cross tubings for aerodynamic intents and the breadth can be 7feet.

Two land managing gear wheel assemblies may be attached to for good installed adjustments on the skid cogwheel to ease land handling.

Tail Skid: –

A cannular steel tail skid is installed on the aft terminal of the tail roar. The skid act as a warning to the pilot upon an accidental tail-low landing and AIDSs to forestall tail rotor from harm.

Engine: –

Engine parts: –

Piper spares: –

Tube: –

Hosiery: –

Clamps: –

Cylinder hold-down nuts and prison guards: –

Self-locking nuts: –

Types of engines: –

Shaft engines: –

Internal burning engines: –

Piston engine: –

They are largely used for little propellor aircraft because they consume comparatively minor portion of fuel.

Wankel engine: –

Turbines: –

Propjet: –

The propellor is supported by engine, and the engine is bolted to the airframe. They feature a gear box to lower velocity of the shaft so that the propellor tips do n’t make supersonic velocity. Often the turbines which drive the propellor are separate from the remainder of the rotating constituents so that they are free to revolve at their ain velocity.

Advantage: –

High power, and low care. It is efficient when operated in sail velocities

Disadvantage: –

Turboshaft: –

It is same as that of turbopop. It does non supply any direct physical support to the rotors. The rotors are connected to a transmittal, which itself is bolted to the airframe, the engine feeds the transmittal via a rotating shaft.

Advatages: – Large sum of power and a low weight punishment.

External burning engines: –

Steam-powered: –

In-line engine: –

If the engine crankshaft is located above the cylinders, it is called and inverted inline engine. In this engine the cylinders are lined up in one row and the cylinders will be of even Numberss, but there are cases of three and five cylinders.

Advantages: –

It allows the aircraft to be designed with a narrow frontal country for low retarding force

Disadvantages: –

They are heavy

Rotary engine: –

The crankshaft is bolted to the airframe, and the propellor is bolted to the engine instance. They have all the cylinders in a circle around the crankcase.

Advantages: –

It was light weight, powerful, inexpensive

Disadvantages: –

Consumed big sums of Castor oil and heavy rotating engine made it really hard to wing.

V-type engine: –

In this the cylinders are arranged in two in-line Bankss, tilted 30-60 grades apart from each other.

Advantages: –

Higher power-to-weight ration and supplying little frontal country.

Disadvatages: –

Radial engine: –

This has one or more rows of cylinder arranged in ac circle around a centrally located crankcase. They have uneven figure of cylinders.

Advatanges: –

They are besides favourable power to burden ratio, and the radials tend to chill equally and runs swimmingly.

Disadvantages: –

Serious harm due to hydrostatic lock

Opposed engine: –

They have two Bankss of cylinders on opposite sides centrally placed crankcase.

Advatages: –

No jobs of hydrostatic lock, they run swimmingly.

Disadvatages: –

Chemical reaction engines: –

Turbines: –

Fanjet: –

Turbofan/Jet engines: –

The highest part of air power fuel is consumed by big aircraft with big engines.

Rocket-powered: –

Motorjet: –

Pulsejet: –

Ramjet: –

Scramjet: –

Cooling: –

It is needed to chill the engines and to maintain the temperatures of the engine low to last.

There are two types used for chilling they are

Liquid chilling: –

They use circulation pump to chill. They use a mixture of H2O and chemicals such as coolant and rust inhibitors. Propylene ethanediol, ethylene glycol combination of the old and H2O are used as coolant.

In liquid chilling there are 4 types of system.

Closed Ic engine chilling system

Open Ic engine chilling system

Open Ic engine with thermic energy recovery

Semiclosed Ic engine chilling system

Advantages: –

Low emanations, low noise

Large liquid-cooled engines can be built ( 107000hp )

Disadvantages: –

The coolant is renewed sporadically.

They cause engine harm due to stop dead at ordinary temperatures

Air chilling: –

It is used to vary chilling so the engine is neither excessively hot nor excessively cold. It regulates adjustable baffles in the air flow, a fan which operates either independently of the engine such as an electric fan, which has adjustable clasp, thermostatic valve or thermoregulator that can be used to barricade the coolant flow when excessively cool. The motor, coolant, and the heat money changer have some heat capacity which used to smooth out temperature additions in short dashs.

Advantages: –

Reliable even in utmost heat, less maintence cost, high emanations and high noise

No engine harm from stop deading and do n’t necessitate any coolant service

Disadvantages: –

Rapid wear, Expensive, Hot musca volitanss are hard to avoid.

` Merely little air-cooled engines can be build. ( 500kw )

Frost: –

It causes to halt the operation of the parts and halt their operation.

Airframe frost: –

It is caused by seeable wet and temperatures conducive to it. As the aerofoil moves through the air, the venture consequence that creates lift besides cools the air as it flows over the aerofoil and signifiers wet and you have ice, even wet besides adds the chilling consequence. Icing is formed on the rotor blade is non seeable and besides on the windscreen

Initiation frost: –

It is build when the air consumptions ices over, or stop up up with ice that has built up on the surface similar to airframe frost. The status are same as the airframe.

Carburetor frost: –

It is caused on the carburettor. As the air passes through the venture, the wet contained in the air condenses on the interior of the carburettor in the country of the throttle home base. Besides as this air passes through the Venturi it is cooled enormously particularly as the fuel is introduced into the flow. Once the temperature inside the carburettor drops to stop dead, ice Begins to roll up.

Manifold: –

It is mounted transversally with airfoiled form and filled with the anti-icing/deicing fluid which causes unstable droplets to organize along the rear border of the manifold and to so drop downwards by gravitation and it is caused from little separated gaps, instead than spray externally.

Fuel armored combat vehicles and cells: –

It is used to hive away the fuel which is propelled by fuel pump or released by pressurized gas into engine. It is a safe container for flammable liquids. The stuff used in building is high-density polythene, metal which is of steel or aluminium.

Types of fuel armored combat vehicles are

Built-in: –

These armored combat vehicles are inside the aircraft construction that has been sealed to let fuel storage. They are used to hive away fuel in the wings and tail of aeroplane. They are used in big aircraft.

Rigid removable: –

They are installed in a compartment designed to suit the armored combat vehicle. They are used in little aircraft. They are constructed with metal and they may be removed for review, replacing, or fix.

Bladder: –

These are reinforced rubberized bags installed in a subdivision of aircraft construction designed to suit the weight of the fuel. It is rolled up and installed into the compartment through the fuel filler cervix or entree panel, and is secured by agencies of metal buttons or catchs inside the compartment.

Self-sealing fuel armored combat vehicles: –

It automatically seals little holes or harm caused during combat operations. It is non a slug cogent evidence, simply puncture sealing.The natural stickness of gum elastic and the basic qualities of gum elastic and crude oil seal the hole.

Fuel Cells: –

It is an electrochemical cell that converts a beginning fuel into electric current. It generates electricity inside a cell through reactions between a fuel and an oxidizer, triggered in the presence of an electrolyte. The reactants flow into the cell and the reaction merchandises flow out of it, while the electrolyte remains within it. It can run continuously every bit long as the necessary reactant and oxidant flows are maintained.

Drag: –

It is simple force that opposes the gesture of an aircraft through the air.

The other retarding forces produced by it are

Entire retarding force: –

It is the amount of the all retarding forces. The best-rate-of-climb velocity, minimal rate-of-decent velocity for autorotation, and maximal endurance velocity is attained which has low retarding force which is produced by airspeed.

Profile retarding force: –

It is formed from frictional opposition of the blades go throughing through the air. It increases with the airspeed.

Induced retarding force: –

It is formed from the higher angle of onslaught. In rotary-wing the retarding force is decreases with the increased velocity.

Parasite retarding force: –

It is formed from the nonlifting parts such as fuselage, cockpit, engine hoods, rotor hub, and set downing cogwheel, and tail roar. It increases with airspeed.

Fairing: –

It is a construction whose primary map is to bring forth a smooth lineation and cut down retarding force

Types of Fairing

Hood: –

It is the covering of a chopper engine. It used to cut down the retarding force, air consumption for jet engines and for chilling by directing air flow.

Tail cones: –

To cut down the signifier retarding force of the fuselage, by retrieving the force per unit area behind it. For the design velocity they add no clash retarding force.

Wheel bloomerss: –

It is besides called as velocity fairings. They besides have the Important map of forestalling clay and rocks from being thrown upwards against the wings or fuselage, or into the propellor on a thruster trade.

Flying roots: –

To cut down intervention retarding force. It is on the top and below the wing which has a rounded border to cut down the surface and such clash retarding force. At the taking and draging border it consists of much larger taper, high force per unit area and low force per unit area on top of the wing and around the fuselage and smooths out the force per unit area differences.

Flying tips: –

They have complex form to cut down vortex coevals and so besides drag, particularly at low velocity.

Fin and rudder tips: –

To cut down turbulency at the tip

Elevator and horizontal stabilizer tips: –

To smooth air flow at the tips

Strut-to-wing and strut-to-fuselage: –

To cut down retarding force at these junctions

Fixed set downing gear junctions: –

To cut down retarding force at these junction

Flap path fairings: –

It is the cross-sectional country which changes swimmingly along the length of the aircraft. Smooth cods are placed on the tracking borders of the wings and are called anti-shocking organic structures, carrots, flap path fairings

Body: –

Tail roar: –

It is attached to fuselage by four big bolts, supports the tail rotor, five, and synchronized lifts. It is tapering semi-monoque construction.

It consist of

Honeycomb panels: –

These panels are used to insulate the aircraft from fire incursion. They are fabricated from a low modulus, carbon/phenolic honeycomb and thin, low modulus, pitch based carbon/phenolic face sheets. These panels were so processed into high thermic conduction, high modulus carbon-carbon composite constructions.

And these are used alternatively of extra protection to wiring etc which cause more cost and weight.

Longerons: –

It is a thin strip of wood, metal or C fibre, to which the tegument of the aircraft is fastened. They are besides called frames in the instance of the fuselage, or ribs in the instance of a wing. If the longitudinal members in a fuselage are few in figure ( 4 to 8 ) so they are called longerons. They are closely spaced ( every 4to 6 in/10 to 15 centimeter ) . These are of larger cross-section when compared to stringers. They carry larger tonss, and they are attached to frames or ribs.

Stingers: –

If the longitudinal members are legion ( 50 to 100 ) so they are called stingers. In this system the longitudinal members are smaller and the frames are spaced farther apart ( 15 to 20 in/38 to 51 centimeter ) . They are non attached to anything but tegument. They are more weight efficient, more complex to build and analyse.

House tail rotor thrust shaft: –

Provides power to the tailrotor from the transmittal.

Electrical equipment: –

Tow blower: –

It is used to supply forced air airing.

Synchronized lifts: –

It is located near the aft terminal of the tail roar and is connected by control tubings, bellcranks and mechanical linkage to the bow and aft cyclic control system. Fore and aft motion of the cyclic control stick produces a alteration in the synchronised lift attitude, therefore increasing controllability of the chopper

Five: –

Holds the tailrotor and provides sidelong stabilisation.

Fuselage: –

It is the chief organic structure subdivision that holds crew and riders. In single-engine aircraft it will normally incorporate an engine, although in some amphibian aircraft the individual engine is mounted on a pylon attached to the fuselage which in bend is used as a drifting hull. It is besides used to stableness of the aircraft and manoeuvrability.

Rain Removal systems: –

( I ) Shutoff valve: –

Switch over to command valve on ECS panel, 28-VDC incidental coach.

( two ) Thermo switch: –

Located in windscreen and controls air blending valve to keep temperature on windscreen of 100 _+50F ( 38+-30 ) to 125 _+50F ( 52+_30 ) .

( three ) Air mixing/clearing valve: –

Electronically/thermally controlled and pneumatically operated to keep proper temperature of air to forestall windshield harm.

( four ) Duct: –

Screened recess on left side of olfactory organ for ambient air entryway to air mixing/clearing valve.

( V ) Drain valve: –

Low point in system to run out condensation when system is away. Operates automatically.

Wire work stoppage protection system: –

It is designed to protect the choppers from wire abstructions at low degrees of flight.

It consists of

( I ) Window channel: –

( two ) Stonecutter assembly

Upper cutter: –

It is mounted on top of the pilot station, forward of the ADF cringle aerial.

Lower cutter: –

It is mounted on the forward fuselage, under the ammo compartment.

Chin cutter: –

It is mounted under the nose, merely forward of the artilleryman station.

( three ) Nose deflector: –

Composite stuff: –

Composite stuff is of two types they are

Glass fiber reinforced plastics: –

It consists of glass fibers dispersed within a polymeric matrix, which is used to adhere the fibers together, leting any external emphasiss to be conveyed and distributed to fibers and being malleable, comparatively soft and with a high malleability, and besides used to forestall cleft extension between fibers.

The belongingss are dependent on the fibre way and such sheets are anisotropic. Anisotropic is nil but material physical belongingss.

Advantages: –

Lightness, bargain rate and more strength

Their chemical inertness besides make them extremely desirable for usage in rotor blades

Disadvantages: –

They lack stiffness

Carbon fiber reinforced plastics: –

These fibers are manufactured from polyacrylonitrile ( PAN ) , pitch and rayon and as a consequence they have the highest specific modulus of all reenforcing fibre stuffs.

Specific modulus is nil but it gives an indicant of a stuff ‘s stiffness for a given mass or denseness of the stuff. A high stiffness/low denseness is really desirable in aerospace applications, for weight economy.

These composite stuffs are used because they have good strength-to-density rations which are four or six times greater than steel or aluminum. And besides lighter than metals, easy to joined with adhesives, simplifying assembly. And these are used in creative activity of blades which are other than subjected to highly rough conditions.

The conditions are both operational and environmental. Rotational tip speeds of about 200 m/s, and rolling during flight, are coupled with extreme in both humidness and temperature. The latter can change from -400c to +900c. So, the complexs can be made to carry through these belongings demands