Equipment Portal
Skywalk Tequila4 S |
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Instability rating |
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Glider characteristics |
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Launch preparations: average
launch characteristics: balanced, climbs constantly, no guidance necessary, good feedback during inflation, moderate braking required, slows before zenith, control check simple, low takeoff speed
asymmetric collapse: moderate dynamics, total course change 180-270°, (3), marked forward pitching 60-75°, (4), high height loss 40-49 m, (3), low sink velocity 10-14 m/s, (1), collapse on opposite wingtip with course change <90°, (4), with tendency to cravat, (4), G-Force 2,5- 2,9 G, (2)
Frontal collapse: marked pitch backwards 45-60°, moderate pitch forwards 30-45°, moderate dynamics, no course change, (1), variable recovery behaviour, at times immediate, at times delayed, automatic recovery, (3), symmetric recovery, immediate return to normal airspeed, high height loss 40-49 m, (3), very low sink velocity <10 m/s, (1)
Spiral dives: rapid sink velocity increase, High G-Force 4,0-4,5 G, (3), Sink velocity after 720° < 22 m/s, (4), Very high maximum sink velocity <25 m/s, (4), sink velocity increase < 3 m/s on brake release, (1), Course change 540-720° after spiral exit, (4), Very high height loss during recovery >100 m, (4)
B-Stall: normal force required, marked pitch backwards 30-45°, marked pitch forwards 30-45°, unstable sink phase, no tendency to deform, immediate return to normal airspeed, 8-10 m/s, height loss on recovery < 20 m
big ears: simple initiation, unsteady flight phase, wingtips flatter markedly, immediate automatic recovery, Vsink unaccelerated 3,5-4 m/s, Vsink accelerated 3,5-4 m/s, Vunaccelerated 3-5 km/h less than trimspeed, Vaccelerated 5-8 km/h faster than trimspeed
Steering behaviour: agile, 75 cm brake travel range, very noticable brake pressure increasse, Late stall point, easily identifiable |
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Notes |
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Asymmetric Collapses: Asymmetric collapses within the EN/LTF test field markers were very difficult to produce on Skywalk's Tequila4. Test pilots needed on occasion both hands to collapse the glider, after which the glider rotates minimally, but pitches forward quite markedly. This, in combination with impulsive re-inflation often resulted in a further deformation or collapse on the opposing wingtip. Front Collapse: Skywalk's Teqila4 was again rather collapse resistant and it is very difficult to perform a massive front collapse on the glider. Recovery characteristics are somewhat random; on occasion re-inflation was rapid and the glider dived moderately, at other times the wingtips stay folded and delay recovery. Spiral Dive: Skywalk's Tequila4 (low end LTF B class) rapidly attains a high sink velocity and continues to turn on exiting once the brakes have been released while maintaining a sink velocity of 18-19 m/s. Should the pilots harness be set up for minimal weight shifting, the glider shows tendencies to enter a stable spiral dive. B-Stall: Difficult to hold, especially for high sink rates. Glider wants to self exit. Big Ears: High forces require to keep wingtips collapsed, Glider has a strong tendency to self exit. |
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Rating |
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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. |
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