Plane Answers: Kent's 3 favorite and 3 most dreaded runways.

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11-26-2008 @ 2:43AM

Larry said...

How much are the speeds changed if these aircraft have maybe one quarter total fuel left in the tanks at landing. If I understand it correctly Maximum Landing Weight is very close to Max Gross Weight after some reduction of fuel load during run-up and takeoff and burn-off or dump as necessary. A few hundred thousand pounds of fuel would seem (weak layman's logic) to require more speed not to mention more runway. Is there much difference in the speed with tanks full as opposed to tanks one quarter full?

11-26-2008 @ 2:47AM

Kent Wien said...

Good point Larry.

Adjust most of those numbers down about 20 knots to get a ref speed for a very light aircraft. I know the 737-800 could see a ref of 128 knots when very light as opposed to the 148 knots at max landing weight.

The 757 requires about an extra knot for every 3000 pounds of weight.

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