APCO Aviation NRG Pro II, Manual

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SRS – Stall Recovery System
The NRG XC II features a new, innovative, riser design allowing the pilot to slow down the
glider to minimum speed without risking getting caught in deep stall ( parachutal ). The SRS
(patent pending) takes advantage of simple yet proven aeronautical and physical principles.
When flying, most of the load is applied to the front third of the wing. This means that the A
lines bear significantly more load than the C+D lines together. However, when the glider is
in deep stall ( parachutal ), the load is distributed almost evenly along the wing chord. Thus,
in parachutal, the load on the C+D lines is considerably higher than on the A lines. Using
this principle, we designed a self-compensating angle of attack (AofA) system based on a
sliding riser concept.
The C+D riser join the A risers and slide in opposite direction. In flight, the A riser is taut and
pulls the C+D to trim position. When forced into parachutal, The C+D riser elevate and pull
down the A riser, accelerating the glider out of parachutal. Once recovered, the risers
automatically resume trim position.