## Saturday, September 18, 2010

### How An Airplane Flies...!!!

In order to understand how wings keep airplanes up in the air, it is important that we take a quick look at four basic aerodynamic forces: lift, weight, thrust and drag.
In order for an airplane to fly straight and level, the following relationships must be true: Thrust = Drag and Lift = Weight. If, for any reason, the amount of drag becomes larger than the amount of thrust, the plane will slow down.
If the thrust is increased so that it is greater than the drag, the plane will speed up. If the amount of lift drops below the weight of the airplane, the plane will descend. By increasing the lift, the person flying the plane can make the airplane climb.
Thrust is an aerodynamic force that must be created by an airplane in order to overcome the drag. Airplanes create thrust using propellers, jet engines or rockets.
The plane's propeller, acts like a very powerful fan, pulling air past the blades. Drag is an aerodynamic force that resists the motion of an object moving through a fluid. The pilot wants to make the aircraft as small as possible to reduce drag. The amount of drag produced by the landing gear of a jet is so great that, at cruising speeds, the gear would be ripped right off of the plane.
Every object on Earth has weight including air. A 747 can weigh up to 870,000 pounds and still manage to get off the runway. Lift is the aerodynamic force that holds an airplane in the air. On airplanes, most of the lift required to keep the plane aloft is created by the wings.
A principal concept in aerodynamics is the idea that air is a fluid. Like all gases, air flows and behaves in a similar manner to water and other liquids. In fact, basic aerodynamic tests are sometimes performed underwater.
Another important concept is the fact that lift can exist only in the presence of a moving fluid. This is also true for drag.
Consequently, neither lift nor drag can be created in space where there is no air. This explains why spacecraft don't have wings.The Space Shuttle is a good example of a spacecraft that spends most of its time in space, where there is no air that can be used to create lift. However, when the shuttle re-enters the earth's atmosphere, its small wings produce enough lift to allow the shuttle to glide to a safe landing.
In the late 1600s, Isaac Newton theorized that air molecules behave like individual particles, and that the air hitting the bottom surface of a wing behaves like shotgun pellets bouncing off a metal plate. Each individual particle bounces off the bottom surface of the wing and is deflected downward. As the particles strike the bottom surface of the wing, they impart some of their momentum to the wing, thus incrementally nudging the wing upward with every impact.
Air approaching the top surface of the wing is compressed into the air above it as it moves upward. Then, as the top surface curves downward and away from the airstream, a low-pressure area is developed and the air above is pulled downward toward the back of the wing.
Air approaching the bottom surface of the wing is slowed, compressed and redirected in a downward path. As the air nears the rear of the wing, its speed and pressure gradually match that of the air coming over the top. The overall pressure encountered on the bottom of the wing are generally less than those on the top of the wing.
When you add up all the pressures acting on the wing, you end up with a net force on the wing. A portion of this lift goes into lifting the wing and the rest goes into slowing the wing down. As the amount of airflow turned by a given wing is increased, the speed and pressure differences between the top and bottom surfaces become more pronounced, and this increases the lift. There are many ways to increase the lift of a wing, such as increasing the angle of attack or increasing the speed of the airflow.
In general, the wings on most planes are designed to provide an appropriate amount of lift, along with minimal drag, while the plane is operating at its cruising speed. However, when these airplanes are taking off or landing, their speeds can be reduced to less than 200 miles per hour. This dramatic change in the wing's working conditions means that a different wing shape would probably better serve the aircraft.
To accommodate both flight conditions, airplane wings have moveable sections called flaps. During takeoff and landing, the flaps are extended rearward and downward from the trailing edge of the wings. This alters the shape of the wing, allowing the wing to turn more air, and thus create more lift. The downside of this alteration is that the drag on the wings also increases, so the flaps are put away for the rest of the flight.
The most important parts of an airplane, after the wing, are the propellers and engines. The propellers or jets provide the thrust that moves the plane forward. A propeller is really just a special, spinning wing. If you looked at the cross section of a propeller, you'd find that a propeller has a wing shape and an angle of attack.
The landing gear is also essential during take-off and landing. Some small planes have fixed landing gear, but most larger planes have retractable landing gear to reduce drag while in flight.
The tail of the airplane has two small wings, called the horizontal and vertical stabilizers, that the pilot uses to control the direction of the plane. With the horizontal tail wing, the pilot can change the plane's angle of attack, and therefore control whether the plane goes up or down. With the vertical tail wing, the pilot can turn the plane left or right.

## Monday, September 13, 2010

### 19TH BirthDay...!!!

19 Years ago, on a beautiful summer's day, I came out from a dark yet wonderful and safest place to be on earth where every human longs to return but none made it...Hahaha....

So, Its my birthday...(13th September)...Tones and loads of wishes and blessings from friends and families....

I rise early today later to know that I'm going to be the driver for the day which looks like 'nothing is going to workout, if I didn't move my ass' type of thinking....

The whole day up to 1p.m was busy shuttling my brother and my grandma to and from the hospital several times...Gosh... Wish i could tell my mum 'It's pretty hot out there + traffic, I'm not going to shuttle them' which eventually i did told her...

What i love most about my mum is she had been preparing good and special food for every Birthday of mine for the past 19 years...Wow.....Thankss mum.... So as she did today....

My dad had been asking me for the past one week 'what do you want for your birthday?'...i gave him a sly look...hehe...actually i dun know what i ever wanted...so i kept quiet... I'm always like this...different form my other siblings...which they would tell what they want(even if my dad didn't ask)hehe...Dad still awaits my verdict....which will never be foretold...

My day pass as usual nothing special i did....Lingering around....Sleeping....Eating....
Then later at night night my dad held my hand and gave me something which i eventually knew it was \$\$\$...Wow....what am i going to do with this money?? spend? save?..well it didn't bothered me too long until i knew what to do with that \$\$\$...

At 9.00 p.m my mum and myself visited my brother at the Hospital.... My heart got flatten and down when i saw an old man presenting with renal failure was warded beside my brothers bed... you wouldn't believe what my eyes had ever captured... A poor man... I overheard his conversation with the nurse,
"pak cik dah boleh balik dah, xada siapa ke yg nak dtg tgk pak cik and ambik pakcik blk....???, esk pak cik kena balik seorang la!" O God...my heart sanked even deeper....He is an old champ living his last bits and pieces of life..which idiotic and ungrateful children would do this to him.... This old man walks 90 degrees body bend which i tell you its much more pitier and sad to see...even i could not walked like that for a long time...
I nearly scolded the nurse in charge, after seeing his cloth were not clean and were not changed for nearly a month... his water bowl was in a condition that is worse than any feeding animals would have...He feeds only on plain bread with some little and tiny ants on top crawling.....Comm'on folks he's a human and he deserve to be treated as one....My wonderful mum spend some time..talking to him....
I told my brother to try to ask the old man by tomorrow where does he lives because i thought of giving him a lift back home...but the problem is I would not have any cars tomorrow....Gosh.....what a sad thing to see an old champ walking from HUSM to Pasir Hor 90 degrees bony bend....how gross it should be....I gave him some pocket money..in case he needs it...

When I look at this man.... I felt oh how lucky I'm and I realized that God had blessed me with so many things that i could ever hoped for...and yet sometimes we as humans do take it for granted...even if we have enough and still we think it's not enough...
"Man shall conquer money and yet feels not enough, But if u feed a man with a fraction of your money he will feel satisfied through out his life and will bless you"
Remember people..."what goes around comes around" and I strongly believes in those phrase...

I felt happy at least i did something good this year..even though they meant nothing for some people..but i believe that it meant a tones of happiness for that old champ....

All the decisions that I've made and the people that I've met through this 19 years is who I'm today...Thanks so much to Every single Person that have been through Good and Hard times with me over the years..Indeed
I'm glad of whom I'm today...!!!

## Tuesday, September 7, 2010

### Holiday!

Hey Guys....!
It's been a while since my last post...been busy with Xm's...Xm's... and again Xm's.....pheww....
Masterskill is well known for having frequent examinations...hehe..(kidding)

Well...times are getting tough for me back these days...as i said xm's, uncle got sick and had a open heart surgery...he had blocks in the 3 major arteries of the heart....(sad).....

Erm....but now im happy...all my worries are gone..xm's r all over..my uncle is duin good now...and on top of that i'm so damn happy because at least my college thought of these phrase 'Have a break, Have a KIT-KAT'
So, now i'm on Raya holiday....for about 10 days only(but its better than none ryte)....
So far no fixed plans yet... thought of visiting my uncle in KL.... Or jux past the time by reading my unfinished Novel's(because of xm's)hehe....

But having a second thought of studying 'abit' la.... :) ....especially Neurology...(toughest subject)....
and yeah one more thing... Guin to my uncle's house for raya.... sure will enjoy..especially when u r served with good and delicious cook food....WoW..hehe....

Anyway....hope its guin to b a good holiday for me......planning to not waste time...;)))))))))