Deep Parachutal or Constant Stall
Definition:
A stall happens when the angle of attack reaches a point where the laminar flow over the wing is detached from the top surface. Unlike full stall, the wing stabilizes in this mode and descends more like a parachute. All 3 terms (Deep Stall, Parachutal Stall, Constant Stall) describe the exact same form of stall.
in a parachutal stall, the wing appears normal, but is infact descending vertically like a parachute, hence the name. the wing is very calm when this happens. airflow is not normal but it is relatively smooth.
A parachutal stall can be induced UN-intentionally by the pilot by flying too close to the stall point (normally by trying to maximize lift by slowing the glider down), or by flying slowly and going into wind shadow.
what causes a glider to become parachutal?:
1. pumping out big ears with too long/slow strokes,
2. slowing the glider down too much during flight
3. flying into wind shadow
4. wet gliders are at risk of becoming parachutal
5. when coming out of a full stall, the glider may go parachutal if the brakes are released too slowly.
6. coming out of a b-line stall too slowly
Solution :
Release brakes to full-up position, then lower the angle of attack with speed bar or by leaning on/pulling downward on the A-risers.
Discussion - The solution for a wing that has entered a deep stall is to lower the angle of attack. Most modern wings rarely enter this, but if they occur, lowering the angle of attack will help increase the airspeed and the laminar flow will reattach to the top of the wing. This can be done by pushing the speed bar, or, if this is not possible, leaning on, pushing forward, or pulling slightly down on the A-risers.
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