What is the take off speed for an airplane?

Answer 1

Take-off speeds vary according to the aircraft design and the operating weight. Some light aircraft like Piper Cubs, for instance, can take off at 40-50 kts, while large commercial airliners like the Boeing 767 have a take-off speed range from 125 to 175 kts...again, depending on weight and configuration. The density altitude of the airport also affects take off speed.
There is no single answer to this question. A fixed wing aircraft's wings generates lift when the air moves over it. As the speed increases, a point will be reached where the lift equals the weight, and the aircraft is able to become airborn. Different aircraft have different applications. For example some aircraft are built for speed, others for lifting. They will have different wing areas which match their use. The smaller the wing area, the less the lift at a given airspeed, and thus the higher the takeoff speed. However they will have a higher top speed. A glider for example will become airborn before its tug, as it is a light structure with a large wing area. A fighter plane has a small wing area, needs a higher takeoff speed, but will move much faster through the air.
Small planes (piper, Cessna etc.) about 70-110 mph.

Medium planes (727,737) about 190- 230 mph.

Large planes (747,757) about 230-265 mph.
This varies greatly from one type of airplane to the next. Some of the smaller single-engined private planes can take off at speeds as low as 45mph, while most airliners need about 100mph for takeoff.

The Airbus 380 and the Boeing 747 are both typically at 170-180 mph.

This also depends on other factors such as the weight of what they are carrying, weather conditions (wind, storms & air pressure) and even the angle of the runway can all affect the aircraft take-off.
Takeoff speed is the speed at which the wings generate enough lift for the airplane to begin to fly.
The speeds needed for takeoff are relative to the motion of the air (indicated airspeed). A headwind will reduce the ground speed needed for takeoff, as there is a greater flow of air over the wings. Typical take-off air speeds for jetliners are in the 130 to 155 knot range (150 to 180 miles/hour, 250 - 290 km/hour.) Light aircraft, such as a Cessna 150, take off at around 55 knots (63 miles/hour, 100 km/hour). Ultralights have even lower take-off speeds. The take off speed is directly proportional to the aircraft weight; the heavier the weight, the greater the speed needed. Some aircraft specifically designed for short takeoff and landing can take off at speeds below 40 knots, and can even become airborne from a standing start when pointed into a sufficiently strong wind.

This is a very broad question considering how many planes there are. Most single engine propeller planes take off around 70 mph. Commercial airliners around 140 mph.

It depends on the aircraft.