Admin Table of Contents
- 1 How much thrust is needed to take off?
- 2 How much force does a plane need to take off?
- 3 How much thrust does it take to lift 300 pounds?
- 4 What is the takeoff speed of a 737?
- 5 How fast do planes accelerate on the runway?
- 6 How fast does a 747 go at takeoff?
- 7 What are the factors that affect take off thrust?
- 8 How much thrust would it take to fly the A380?
How much thrust is needed to take off?
For an airplane, normal takeoff, you need about 70 pounds of thrust (rule of thumb 5:1). As the plane accelerates past stall speed, the power required to maintain flight is a lot less than for take-off.
How much force does a plane need to take off?
A Boeing 747-8 passenger airliner, for instance, has a maximum takeoff weight of 487.5 tons (442 metric tons), the force with which the weighty plane is drawn toward the Earth. Weight’s opposing force is lift, which holds an airplane in the air.
Do pilots use full thrust for takeoff?
Answer: Most takeoffs use “derated” thrust to save engine wear. For each takeoff, performance is calculated, the necessary power setting is determined and the thrust setting is made.
How do you calculate thrust needed?
- Thrust is the force which moves an aircraft through the air. Thrust is generated by the engines of the airplane.
- F = ((m * V)2 – (m * V)1) / (t2 – t1)
- F = m * a.
- m dot = r * V * A.
- F = (m dot * V)e – (m dot * V)0.
- F = (m dot * V)e – (m dot * V)0 + (pe – p0) * Ae.
How much thrust does it take to lift 300 pounds?
To hover it will need 400lbs thrust. To raise it you need to overcome gravity, any thrust that exceeds the force due to gravity will keep raising it. As fuel is used it will gradually require less thrust to hold it in the same place because it weighs less.
What is the takeoff speed of a 737?
However, a good average speed range is about 160 mph (260 km/h) to 180 mph (290 km/h)….
| Aircraft | Takeoff Weight | Takeoff Speed |
|---|---|---|
| Boeing 737 | 100,000 lb 45,360 kg | 150 mph 250 km/h 130 kts |
| Boeing 757 | 240,000 lb 108,860 kg | 160 mph 260 km/h 140 kts |
How fast do planes fly in mph?
around 460-575 mph
Most commercial aircraft typically fly at around 460-575 mph, or 740-930 km/h, according to Flight Deck Friend. But private jet speed can vary depending on a variety of factors, such as the weight onboard and the weather conditions.
Why do pilots reduce thrust after takeoff?
Pilots reduce thrust after takeoff mostly because of noise abatement procedures at the airport. Engines produce their most noise at takeoff power & to keep the local neighbor’s happy airport departure procedures call for a reduction in power from 800 feet to 3000 feet to reduce noise pollution.
How fast do planes accelerate on the runway?
An average commercial jet accelerates to between 120 and 140 knots prior to liftoff. To do this in 30 to 35 seconds requires a good sustained acceleration. This is something that pilots look for during a takeoff roll.
How fast does a 747 go at takeoff?
The 747 goes from its approximate takeoff speed of 200 mph (89.4 meters per second) to 0 mph in 27 seconds.
How much thrust does it take to sustain flight?
The thrust needed to sustain flight is about 1/18 of aircraft weight, and if you factor in the multiples given above, you will notice that if the aircraft can fly at full thrust in cruise, this fits nicely with a static sea level thrust force equivalent to one third of its weight force.
What is the amount of thrust in a jet engine?
If by “amount of thrust”, you mean the acceleration force: engine power ranges from 160hp on small propeller planes to thousands of pounds in turbine jets (Boeing 777’s engine is rated at 417kN). In most GA planes, takeoff power = full power.
What are the factors that affect take off thrust?
The factors for take-off thrust are: Runway length: Short runways need more excess thrust for faster acceleration. Runway elevation: Higher places have less dense air, so more speed is needed to get airborne, and less thrust is available from the engines than at sea level. Runway slope.
How much thrust would it take to fly the A380?
In other words for each metric ton of weight you need around 9.81 kN of thrust. The A380 has a operational empty weight of 276 t so it would need 2707 kN of thrust to sustain a vertical climb. Its 4 engines each producing 320kN don’t even come halfway.