Cargo Boeing
How long would it take for a Boeing 747-400 to take off in these conditions?
If there was a Boeing 747-400, with RB211-524H-T engines. There was no payload (including cargo) on board at all. The only weight on the aircraft was the two pilots (around 350 pounds altogether) and 38,000 pounds of fuel. The weather was completely clear, apart from a headwind of 60 knots (around 69 mph) with gusts of up to 70 knots (around 80 mph). The runway was concrete. The temperature was around 15 degrees celcius (around 59 degrees farenheit). There was no turbulence or clouds what so ever. Visibility was over 20 miles. The runway was at sea level. How long approximatly would it take for that plane to take off in them conditions?
There are a few factors you haven't mentioned, such as the flap setting, the rate at which throttle is applied, whether or not the aircraft took off from a standing or taxiing start, and even perhaps the condition of the runway. Presuming the 747 was at flaps 10, the pilots went to full throttle immediately, the jet was still before takeoff and the runway was dry, it would take somewhere between 20 and 25 seconds for the aeroplane to become airborne.
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