HELLO FOLKS, I AM SUSHIL . SORRY FOR THE LATE POSTS. ACTUALLY MY END SEMESTER EXAMS ARE GOING ON, SO AM LITTLE TOO BUSY.

BUT I AM BACK AND HERE TO TELL YOU THE CONCEPT INVOLVED IN A VERTICAL TAKEOFF OF THE PLANE .

GENERALLY THIS IS USED AS WE KNOW IN HELICOPTERS WHICH FORM OF THE VERTICAL TAKE-OFF. BUT RECENTLY SOME  AIRCRAFT MANUFACTURERS HAVE BEEN RESEARCHING ON THE CONCEPT OF THE VERTICAL TAKE-OFF FOR THE COMMERCIAL JETLINERS THAT ARE BEEN USED . 

LET’S DISCUSS AND GET STRAIGHT TO THE POINT OF THE TAKE-OFF THE COMMERCIAL JETLINERS.

Takeoff is the phase of flight in which an aircraft goes through a transition from moving along the ground (taxiing) to flying in the air, usually starting on a runway. For balloons, helicopters and some specialized fixed-wing aircraft (VTOL aircraft such as the Harrier), no runway is needed. Takeoff is the opposite of landing.

How do planes fly?

Forces acting on a flying plane: thrust, weight, drag, and lift

If you’ve ever watched a jet plane taking off or coming in to land, the first thing you’ll have noticed is the noise of the engines. Jet engines, which are long metal tubes burning a continuous rush of fuel and air, are far noisier (and far more powerful) than traditional propeller engines. You might think engines are the key to making a plane fly, but you’d be wrong. Things can fly quite happily without engines, as gliders (planes with no engines), paper planes, and indeed gliding birds readily show us.

Photo: Four forces act on a plane in flight. When the plane flies horizontally at a steady speed, lift from the wings exactly balances the plane’s weight and the thrust exactly balances the drag. However, during takeoff, or when the plane is attempting to climb in the sky (as shown here), the thrust from the engines pushing the plane forward exceeds the drag (air resistance) pulling it back. This creates a lift force, greater than the plane’s weight, which powers the plane higher into the sky. Photo by Nathanael Callon courtesy of US Air Force.

If you’re trying to understand how planes fly, you need to be clear about the difference between the engines and the wings and the different jobs they do. A plane’s engines are designed to move it forward at high speed. That makes air flow rapidly over the wings, which throw the air down toward the ground, generating an upward force called lift that overcomes the plane’s weight and holds it in the sky. So it’s the engines that move a plane forward, while the wings move it upward.

airfoil-angle-of-attack-lift-1

NOW AS WE KNOW THAT OW PLANES FLY THEN LETS TAKE A LOOK AT THE VERTICAL TAKE-OFF .

A vertical take-off and landing (VTOL) aircraft is one that can hover, take off, and land vertically. This classification includes fixed-wing aircraft as well as helicopters and other aircraft with powered rotors, such as cyclogyros/cyclocopters and tiltrotors.Some VTOL aircraft can operate in other modes as well, such as CTOL (conventional take-off and landing), STOL (short take-off and landing), and/or STOVL (short take-off and vertical landing). Others, such as some helicopters, can only operate by VTOL, due to the aircraft lacking landing gear that can handle horizontal motion. VTOL is a subset of V/STOL (vertical and/or short take-off and landing.

Besides the ubiquitous helicopter, there are currently two types of VTOL aircraft in military service: craft using a tiltrotor, such as the Bell Boeing V-22 Osprey, and another using directed jet thrust, such as the Harrier family and new F-35B Lightning II Joint strike Fighter (JSF). Generally speaking, VTOL aircraft capable of STOVL use it wherever possible, since it typically significantly increases takeoff weight, range or payload compared to pure VTOL.

Aircraft in which VTOL is achieved by exploiting the Coandă effect are capable of redirecting air much like thrust vectoring, but rather than routing airflow through a duct, the airflow is simply routed along an existing surface, which is usually the body of the craft allowing less material and weight. The Avro Canada VZ-9 Avrocar, or simply the VZ-9, was a Canadian VTOL aircraft developed by Avro Aircraft Ltd. which utilizes this phenomenon by blowing air into a central area, then it is directed down over the top surface, which is parabolic and resembles a bowed flying saucer. Due to the Coandă effect, the airflow is attracted to the nearest surface and continues to move along that surface despite the change in the surface’s direction away from the airflow. The craft is designed to direct the airflow downward to provide lift.

1200x480xdo-32-1200_480-jpg-pagespeed-ic-wn_glyz8uz

NOW THESE VERTICAL TAKE-OFF CONCEPT IS ALRIGHT BUT NOT MAINLY USED IN THE COMMERCIAL JETLINERS AND PASSENGER PLANES .

ALTHOUGH THERE ARE SOME PLANES WHICH HAVE PERFORMED THIS AND I WILL BE LEAVING LINKS TO THE VIDEOS OF THE PLANES DOWN BELOW . DO HAVE A LOOK.

AGAIN WE WILL BE DISCUSSING ON THE REASONS WHY ARE THESE NOT USED IN THE PASSENGER JETLINERS.

THANK YOU.

DO COMMENT YOUR VIEWS AND ALSO SHARE THE BLOG .

LINKS

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