Sailplane pilot reported slipping the airplane on final and losing control effectiveness.

Attributes
ACN	1578885
Time
Date	201809
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Sail Plane
Operating Under FAR Part	Part 91
Flight Phase	Landing
Person 1
Function	Pilot Flying
Qualification	Flight Crew Flight Instructor Flight Crew Glider
Experience	Flight Crew Total 204 Flight Crew Type 48
Events
Anomaly	Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown

Narrative:

I was doing a flight review. I was told to do a no spoiler landing. I put the plane in a slip nose high left wing down. On final heading north I was high so I increase my angle and started to come down faster. When I was low enough I started to straighten the plane out. I moved too fast and over-controlled; when the nose went too far it blocked airflow over the left wing and it stalled. I tried to recover; but the controls didn't respond. When we toughed down the plane was moving west and we were pointed south.to prevent a recurrence: practicing recovery from a slip at a higher altitude and at a slower recovery rate.

Original NASA ASRS Text

Title: Sailplane pilot reported slipping the airplane on final and losing control effectiveness.

Narrative: I was doing a flight review. I was told to do a no spoiler landing. I put the plane in a slip nose high left wing down. On final heading north I was high so I increase my angle and started to come down faster. When I was low enough I started to straighten the plane out. I moved too fast and over-controlled; when the nose went too far it blocked airflow over the left wing and it stalled. I tried to recover; but the controls didn't respond. When we toughed down the plane was moving west and we were pointed south.To prevent a recurrence: practicing recovery from a slip at a higher altitude and at a slower recovery rate.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.