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ADVANCE IOTA 28

Sicherheitsklasse 5
ADVANCE IOTA 28

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
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 5
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.
Expert piloting skills and regular flight practice (>50 hour per year) necessary.

Glider characteristics

Launch preparations: difficult
launch characteristics: dynamic, climbs constantly, no guidance necessary, good feedback during inflation, moderate braking required, control check simple, low takeoff speed
asymmetric collapse: canopy colllapses at high angle to leading edge, moderate dynamics, total course change 180-270°, (3), moderate course change rate, high forward pitching 75-90°, (5), very high height loss 50-59 m, (4), moderate sink velocity 15-19 m/s, (2), collapse on opposite wingtip with course change >90°, (5), with tendency to cravat, (4), G-Force 2,5- 2,9 G, (2)
Frontal collapse: canopy collapses with low total collapse area, marked pitch backwards 45-60°, marked pitch forwards 45-60°, high dynamics, no course change, (1), recovery usually immediate, symmetric recovery, immediate return to normal airspeed, high height loss 40-49 m, (3), very low sink velocity <10 m/s, (1)
Spiral dives: very rapid sink velocity increase, Very high G-Force 4,5-5,0 G, (4), Sink velocity after 720° <14 m/s, (1), Very high maximum sink velocity <25 m/s, (4), sink velocity increase < 10 m/s on brake release, (4), Pilot action required to exit spiral dive, (5), Very high height loss during recovery >100 m, (4)
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, 6-8 m/s, height loss on recovery 20-40 m
big ears: simple initiation, stable flight phase, immediate automatic recovery, Vsink unaccelerated 2,5-3 m/s, Vsink accelerated 3,5-4 m/s, Vunaccelerated 3-5 km/h less than trimspeed, Vaccelerated 0-3 km/h faster than trimspeed
Steering behaviour: agile, very noticable brake pressure increasse, Late stall point, easily identifiable

Notes

Asymmetric Collapse:
Collpapses to the maximum of the test field are easy to induce, and produce marked backward pitching followed by a moderately fast dive forward. Reactions to collapses did not follow a clear pattern, on occasion the glider opened softly, cell-by-cell, but usually openings were fast and impulsive. On impulsive recovery during the dive forward, the glider collapses again on the opposite side which can result in a total collapse of the entire canopy. This behaviour was also noted for collapses in the
middle of the measurement field. Following this, the glider quickly self-recovered without any tendencies to cravat. Opposing collapses also occurred to a maximum of 40%, which did cravat and result in course changes of more than 90° to the opposite side.

Front Collapse:
Re-inflates from the middle, but pitches forward markedly. On one occasion the glider entered a short deep stall phase.

Spiral Dive:
Behaves quite differently: independent of pilot position, the glider remains in a stable spiral dive when the brakes are released and accelerates to a maximum sink velocity of
nearly 25 m/s. Exiting is relatively easy via brake input on the outer wing tip. G-forces of nearly 5 G were measured, and were the highest recorded in this test series.

Big ears:
Easy.

B-Stall:
Simple, slight tendency to front horseshoe. Observation recommended.







Rating

Safety class 5

This class of paraglider reacts very demandingly to one or more of the following manoeuvres: frontal collapse, asymmetric collapse or spiral dive and may present pilots with a particular challenge.
Very demandingly means that the above manoeuvres result in highly dynamic reactions from the glider, and/or large height losses. Critical subsequent glider reactions are also to be expected.

Expert piloting skills achieved through constant practice, fast personal reaction times and precise pilot inputs are required to be able to immediately react to the above manoeuvres to maintain flight control and prevent large height loss or subsequent critical glider reactions. In particular, 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.