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Skywalk Arak M
Sicherheitsklasse 4
Skywalk Arak M

Instability rating
Safety class 1 Safety class 2 Safety class 3 Safety class 4 Safety class 5
asymmetric collapse
course change
forward pitching
height loss
sink velocity
collapse on opposite wingtip
cravat
G-Force
Frontal collapse
course change
Speed (Recovery)
pilot action (Recovery)
cravat
height loss
sink velocity
Spiral dives
G-Force
Sink velocity after 720°
Maximum sink velocity
Behaviour on brake release
course change after spiral dive exit
Height loss during recovery
Safety class 4
Pilot skill requirements:
Pilots should be able to recognise the onset of instability and be able to prevent or minimise glider reactions through immediate and precise pilot inputs.
Advanced piloting skills and regular flight practice necessary.

Glider characteristics
Launch preparations: average
launch characteristics: balanced, delayed climb, needs gentle guidance, good feedback during inflation, little braking required, slows before zenith, control check simple, low takeoff speed
asymmetric collapse: canopy collapses at low angle to leading edge, moderate dynamics, total course change 90-180°, (1), fast course change rate, marked forward pitching 60-75°, (4), high height loss 40-49 m, (3), low sink velocity 10-14 m/s, (1), , , G-Force < 2,5 G, (1)
Frontal collapse: canopy collapses with low total collapse area, marked pitch backwards 45-60°, moderate pitch forwards 30-45°, low dynamics, no course change, (1), , symmetric recovery, , , delayed return to normal airspeed, short deep stall phase, , high height loss 40-49 m, (3), very low sink velocity <10 m/s, (1)
Spiral dives: rapid sink velocity increase, Very high G-Force 4,5-5,0 G, (4), Sink velocity after 720° <18 m/s, (3), Very high maximum sink velocity <25 m/s, (4), sink velocity increase < 6 m/s on brake release, (2), Course change 180-360° after spiral exit, (2), high height loss during recovery 60-100 m, (3)
B-Stall: high force required, moderate pitch backwards 15-30°, moderate pitch forwards 15-30°, stable sink phase, low deformation tendency, , immediate return to normal airspeed, 8-10 m/s, height loss on recovery < 20 m
big ears: simple initiation, stable flight phase, wingtips flatter markedly, , , Vsink unaccelerated 2,5-3 m/s, Vsink accelerated 3,5-4 m/s, Vunaccelerated 0-3 km/h less than trimspeed, Vaccelerated 0-3 km/h faster than trimspeed
Steering behaviour: agile, 70 cm brake travel range, very noticable brake pressure increasse, Late stall point, easily identifiable

Notes

Rating

Safety class 4

This class of paraglider reacts demandingly to one or more of the following manoeuvres: frontal collapse, asymmetric collapse or spiral dive.
Demandingly means that the above manoeuvres result in marked dynamic reactions from the glider and/or large height losses.

Advanced piloting skills which need to be regularly practised, together with good personal reaction times are required to safely fly this class of gliders. Basic recovery techniques for ending a manoeuvre are not sufficient to maintain control, reduce height loss to a minimum and prevent subsequent critical reactions. Pilots should be able to recognise the onset of the above manoeuvres and be able to prevent or minimise their effects through immediate and precise pilot inputs.

Additional experience such as regular ground handling and SIV training is required to safely fly gliders of this class. Special training or pilot skills which exceed standard training may be required for the safe performance of emergency descent techniques. Gliders of this Safety Class are not suitable for beginners, irregular flyers or low-airtime pilots.