by congo » Tue Mar 08, 2005 11:43 am
I think I might know what's wrong...........
INERTIA = Inertia is a bodies natural resistance to any change in direction or acceleration.
A mass resists change in acceleration or direction, the more mass, the more resistance, the more inertia.
A cessna has relatively little inertia because it has relatively small mass (weight). So, it's easy to change it's direction and speed with control inputs.
You get a little out of line in the Boeings, and because of the extra mass (weight) they seem to take forever to respond to the controls and veer from side to side and you just keep oversteering to make it right, but it gets worse.............
The secret is to start your approach well away from the airport and get the aircraft configured for landing (flaps, gear), get speed and descent rate well under control from a long distance out. This gives you time to get the jet lined up with the field smoothly.
You have to consider the extra weight of the jet, (inertia is weight in motion or at rest, and it's a force of sorts), so when the jet starts to veer off course, you have to catch it early or it will get quite bad and then........ you oversteer to correct the error, making an even greater error in the other direction.
It's catch 22 at this point, wrestling with a wobbling 737 at late finals or beyond.
The trick is to stay absolutely calm and make only very small control inputs prior to the round out. This takes a lot of practice and the heavier the aircraft, the harder it is to manage at first. However, once mastered, the heavies will track straight as arrows BECAUSE of their high inertia.
You should be doing almost nothing as far as control input goes near the strip, try to get all the errors in the approach sorted well out from the field, you need plenty of time for this.
The closer you get to the field, the more critical any input is going to be, so you want to be very fine and smooth on late approach, no sudden movements.
Once the aircraft is tracking straight towards the runway, only pitch control and minor directional input is needed, (err, unless it rough air or strong crosswind.)
Beware the temptation to start throwing the plane around violently once in the markers.
Good luck and happy landings!
Last edited by
congo on Tue Mar 08, 2005 12:02 pm, edited 1 time in total.

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