What speed does a Boeing 747 Jumbo Jet take-off and land at?
A look at the speed the at which the Boeing 747 takes off and lands
What speed does a Boeing 747 take off and land?
Speeds vary according to performance, environmental conditions and weight but typically a fully loaded Boeing 747 on a normal long haul flight would take off from a typical length runway at around 160 knots which is 184 mph.
A typical fully loaded 747 would be landing at a weight of around 250,000kgs. The landing speed as this weight would be around 145kts-150kts (166mph-172mph) depending on the landing flap setting selected.
Most airlines and aircraft have a facility to de-rate thrust (or use assumed temperatures) for take-off. This occurs on runways where the aircraft has extra performance in hand e.g. the aircraft does not need the full length of the runway to take-off. Large commercial aircraft rarely use their full engine power for take-off as most runways at large airport long enough to support a reduction in thrust. Take-off thrust might be as little as 75% of the maximum thrust.
Taking off with reduced thrust reduces the temperature the various components in teh engine are exposed to. This in turn can significantly reduce engine wear and tear and thus maintenance costs, and ultimately extend the life of the engine.
Additional Speed for Landing
The greater the flap setting, the lower the take-off and landing speed. Jumbo Jets typically land at Flap 25 or 40. Pilots generally fly the approach speed faster than the actual touchdown speed to allow a speed ‘buffer’ in case of any airspeed fluctuations. This additional speed is ‘bled off’ during the flare or plain terms, the excess speed reduces as the nose is raised just before touchdown. In light wind conditions we would add 5 kts to the approach speed but in strong wind conditions up to 20kts can be added.
B747-400 Maximum Take-Off Weight
The xaximum take-off weight for the B747 is 396,000 KGS / 875,000 LBS
B747-400 Maximum Landing Weight
The Maximum landing weight for the B747 is 285,000 KGS / 630,000 LBS
Ever wondered how much fuel a Jumbo Jet burns? This page might be of interest.