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Old February 27th 17, 04:18 PM posted to rec.aviation.soaring
Tango Eight
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Default Do you crab or forward slip in X wind landings

On Monday, February 27, 2017 at 2:43:08 AM UTC-5, POPS wrote:
Yaw string and coordination in big Xwind landings is my question, with
a real life experience that happened to me... I still wonder if I did
the right thing 3 years ago. Could someone in the know talk about the
lack of any coordination in these situations?

After returning to the field at 3500' agl, the wind had turned on
final, 90 degrees to the left across the only possible place to land,
on a plowed dirt strip. AWOS had the wind solid at 20 gusting to 28. I
lingered as long as I could but the massive cell to the east was not
moving or letting up. Nothing but rough desert landscape everywhere and
altitude winding down.

Field partially disappearing in dust at 800 ft. I set speed at 70 kts,
turned base into the wind, then final and into a deep forward slip,
windward wing down, way down, but not quite holding my target from
drifting away from me to windward. The yaw string was aligned nearly 70
degrees across the canopy which Really got me alarmed. I was calm,
pretty smooth and super focused. Out of the slip and into a huge crap,
no problem. Yaw string was now about 30-40 degrees out with my wings
level crab at maybe 30 degrees to the left. Had control of my target
now with partial spoilers. Field length maybe 500 yards long or so. I
went to the deck and released rudder and flared, lowered my left wing
tip a bit I think. Did a wheel landing at maybe 40, full spoilers and
into breaks as the field seemed to be getting short. Wind got under my
left wing and put the leeward wing down into the dirt at 15+ kts or so
on the roll out. Lost the wing tip skid but held it mostly straight with
my big rudder.
I heard conflicting advice and comments about coordination and this
landing.
Sorry for the long post.


--
POPS


"Released rudder and flared" doesn't make sense.

The crab maneuver should be coordinated as previously mentioned. Rudder neutral, string centered.

The flare and landing is what isn't coordinated. Downwind rudder. Aileron into the wind as required to keep that upwind wing as low as you can.

best,
Evan Ludeman / T8