Re: Landing with a tailwind?


>> <charlesnewman1@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>>> > Why would planes land with tailwinds?
>>>
>>> It can be done, but only with reverse thrusters and autobrakes both
>>> used. I have done it with flight simulator, and I find...
>>
>> Well, I've done it in a 737. And it can be done with neither, provided
>> the runway length is adequate. For shorter runways, the thrust
>> reversers are required. And autobrakes don't stop the airplane any
>> shorter than manual brakes in the 737. In fact, max manual braking
>> provides more braking force than max autobrake. Its advantage is that
>> it's applied a little earlier in the roll, which is why they used it.
>>


I'm surprised that no one has bothered to mention the simple math by which
the process works....

A/c landing normally under optimal conditions with a "landing speed" of 150
knots "into the wind" with a windspeed of 10 knots has an actual ground
speed of 140 knots at touchdown.

The same a/c landing "downwind" with a 10 knot tailwind touches down with a
ground speed of 160 knots.

It takes somewhat more runway to slow and stop the same a/c at the higher
speed.

Watch those aircraft carriers on TV, busily steaming into the wind, balls to
the wall and all ahead Bendix, creating as much wind as is neeeded to reduce
the relative speed of aircraft which are landing, the slower that relative
speed, the more effective and less punishing is the engagement of the tail
hook and arresting gear wires, and to improve the takeoffs of catapulted a/c
by increasing their airspeed, making them more controllable and more likely
to fly successfully.

Landing downwind is an evolution which requires some modest computation as
to whether the additional ground speed may be countered by the length of the
runway.

TMO


.

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