Why do aeroplanes always take off facing the wind?
Answers:
Let's say you have a 20 knot headwind and your computed rotation speed is 140 knots. Your ground speed will only be 120 knots when you rotate because of the 20 knots of headwind. It takes you less runway to accelerate to 120 knots than it would to accelerate to 140 knots. Furthermore, the airplane is going to climb out at a steeper climb gradient which aids in obstacle clearance.
The wind blows through the turbines giving it more thrust power
for the lift.
to get more lift
Because it would take alot more fuel to take off with it? I.E. wind against provides much more lift?
More wind resistance=more lift.
Saves fuel increases lift. But not totally necessary with jet powered aircraft.
Cos it is so coooool.
because they would crash if they faced the airport building
If the wind is blowing at 20mph it effectively gives the plane 20mph more speed, if the plane took off in the direction of the wind it would need to be 40mph faster to make the same windspeed and get lift
Shorter takeoffs and landings more fuel saving.
More lift means more pressure under wing and more suction over wing when you go into the wind.
Aircraft fly through generating lift by airspeed. If it heads straight into a 10 kt headwind and it's takeoff speed is 70 kts, it only needs a 60kt ground speed to take off. Alternatively with taking off downwind it would need 80 kts ground speed to get 70 kts airspeed. Hope this helps.
Steven is the only person even close.
A cessna 172 has a liftoff speed of 55kts, And requires about 1000ft if it needs to clear a 50ft object.
By taking off into the wind, the airspeed relative to the plane is the same, but the ground speed is slower, so the plane can take off in a shorter distance and clear any objects more safely.
Because the wind help the planes to take off better : The air circulate on wing is sharper & the plane can takes off sharp .
The plane can flyed in current way for safty .
it aid with lift and in helicopters if you land or take off into 2down wind" you will lose your ground cushion, which means your take off will be slower, in a conventional aircraft the speed of the wind passing over the wind is slower than under, which creates a low pressure above the wing and as such the high pressure under the wing then pushes it in to the lower pressure area above and as the wings are attached to the plane body it takes off, if your in a down wind take off it is harder to get this low pressure lift..
I can't believe how many people are CLUELESS on this issue yet post their ignorance for all to see!
The ONLY reason is to take off in the shortest possible distance with the lowest possible GROUND speed. If you have enough runway, there's no reason why you can't take off or land with a tailwind. I've done it a number of times.
An airfoil (the wings) will generate lift when there is sufficient RELATIVE wind speed across it. If a wing needs 60 kts of relative airspeed to generate lift, taking off into a 10 kt headwind means that you need only 50 kts of ground speed to get airborne. If you have a 10 kt tailwind, you need 70 kts of ground speed to get those 60 kts and get airborne.
Some airports' design is such that takeoffs and landings can only go in one direction, either due to obstructions at one end of the runway or due to airspace restrictions. The US Navy installation at Guantanamo is an excellent example of both reasons at one airfield. All arriving aircraft must come in over the water and all departing aircraft must depart over the water regardless of the wind direction. Cuban airspace and a rather nasty cliff on the other end of the runway preclude taking off towards land under any operating conditions.
Well, the aircraft should always take off into the wind but that may not be available.
Taking off into the wind shortens your take off roll, lets you lift off at a slower ground speed and will help you climb in a shorter distance.
Many larger aircraft sometimes take off in a light, very light tailwind.
A 10 knot tail wind can add as much as 50% more take off roll.
That being said if and only if you have to take off with a crosswind or heaven forbid a tailwind you have to ensure you are still within the limits of the aircraft.
Any pilot who takes off in a small aircraft with a tailwind, on purpose, because he can, is asking for trouble.
Many small planes can only handle up to 20 knots in a crosswind due to design limitations.
So an airplane takes off into the wind to,
Get better lift,
Slower lift off speed,
Better handling,
Good rate of climb.
All about aerodynamics. The wing of an aircraft generates lift by having air streams of different speed over the top and underneath. By taking of into the wind, those speeds are increased resulting in more lift, a shorter rotate and a higher performance climb.
well, the wind blows onto the undersides of the wings to produce lift. google the bernoulli effect for a better explanation
They don't
To create greater air rush over the wings to give better lift
they don't!!
since when did they start "moving" the runway to face the wind!!
i can see it now.."sorry for the delay .someone has forgoten to move the 1000ton tarmac runway!!..i'll get on it straight away!! Bing Bong."
just think how confused pilots would be on return landing: "er.this is flight 123 .er.someone has ..er..moved Stanstead.by 5 miles."
Hold on!! ( Licks finger.points it skyward..perfect!! )
Ever fly a kite? it increases the airflow over the wings,helping them get off the ground more effectively.
They don't need to, or always do this-the plane is of course able to take off under it's own power on a day with no wind.
When constructing an airport,the prevailing winds are taken into account for laying out he runways.
You could also encounter ground effect - the airplane could take off before reaching the recommended takeoff speed.
It doesn't really matter - you can take off in any wind direction if you had to but taking off and landing in cross-winds isn't fun.
so the Wind will get beneath its wings..HEY SOUNDS LIKE A CUE FOR A SONG..
ok, man. to make it simple: when we speak about the speed of an aircraft we speak about speed that the wind hits plane. so if we presume that we have a 55 knots wind speed (that`s impossibe, of course), and we put our little cessna 172 facing the wind it would be able to lift with his engine shut down. so, pilots decide to take advantage of it, so they take of facing the wind.
so on concluion u should understand what does it mean the wind speed and what does it mean the grond speed.
ab the landings planes face the wind because we have to touch the ground with low ground speed. fact witch isn`t possible if we have the wind on our tail.
hope this helps :D
To stop overshooting? on takeoff, the one time you don`t want to go with the flow!
It's simply so that the aircraft will not need to reach as high a groundspeed for take-off. as you move into the wind, the air flowing past the wing is already at a speed, the wings producing a little lift already. Add your groundspeed to that and soon you'll be airbourne. If you took off with the wind, you would initially be at negative airspeed, your groundspeed would increase until you're travelling at the same speed as the wind (lift at 0), then accelerate further to take off. You'd need a longer runway and would be wasting fuel and time. Why not use nature to assist you?
This is why you have airfields with two, oreven three runways, so that you can get the best headwind for take-off.
Some of the answers here are ridiculous, don't answer unless you know the answer, you insult my intelligence!
Why do aeroplanes takeoff into wind?
Answer, the air travelling over the wing creates lift, when the air travels over the wing fast enough then the wing becomes effective for takeoff.
An aircraft taking off into wind takes a lesser takeoff distance than a tail wind because the the added wind speed over the wing requires less thrust to genrate the wind speed for rotation.
Example, (737 needs let's say 155kts for rotation and the runway conditions is a 20kts into (head) wind. The 737 only needs to achieve a speed of 125kts from 0knts of takeoff thrust because the extra 20 kts totals the 737 rotation speed).
(A tailwind of 20knts therefore means a total runway speed of 175kts from 0)
The ASI (air speed indicator) on a aircraft pointing into wind stationary on the runway will indicate the wind speed and minus that for wind direction aft of the aircaft.
A tail wing would require more takeoff thrust than 0 knotts of wind speed because the wind (air flow) is moving opposite over the wing.
For the same reasons birds do.
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