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Old 11-07-2010 | 03:25 AM
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stuntflyr
 
Joined: Oct 2007
Posts: 1,891
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From: Tucson, Arizona
Default RE: Cross wind landing teqniques

Hi NTSmith,

To align the model's longitudinal axis with the track of the model one must cross control. Just think of landing on the upwind wheel only, then as the model slows down the downwind wheel touches down and then just a little crab angle is necessary to control drift. I typically end the ground roll with the aileron all the into the wind as the model stops. (The "down" aileron provides drag, and aids in directional control by helping to fight the weathervaning on roll out).

Crab in steady state flight does not require any control surface to be deflected. It's just a heading into the wind to make the model track to the runway. When a little ways out on final, roll the upwind wing down and correct the turn with rudder to line 'er up (right aileron/left rudder for NTS's example) on the strip. It's essentially a slip, a cross control exercise our pattern ships do very well.

The crab to a "kick-out" just at touchdown is a technique used on old jet airliners where a bank angle limit was imposed because of low hanging pod engines. It has little to do with Pattern models until the wind velocity requires the wing to be so low the tip scrapes.
Then the pilot must utilize the "combination wing down plus crab" technique. This is where the model lands with the wing down, cross controlled but still holding a crab (heading into the wind) to counter wind drift, which is removed as the model touches down. It often isn't completely taken out as the model needs to crab a little even on the ground to counter the drift of a strong x-wind.

It takes practice. Trike gear trainers are easier to experiment with (one always feels gutsier), so if one is available go shoot a bunch while trying these various techniques trying to fly it along on the upwind main gear wheel the length of the runway. It's fun and you'll learn a lot.

Hope this helps, you've received mostly good help here from the posters above.

Chris...