Bi 4 2

Bi 4 2
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Bi 4 2

Product catalog summary
Flight Test Overview
The flight test for the Sky Paragliders Bi 4 2, classified as a B model, was conducted on 26.10.2017 in Villeneuve. The test pilots were Thurnheer Claude and Zoller Alain, with a total flight weight range of 120-220 kg.
Inflation/Take-off
The glider exhibited smooth, easy, and constant rising behavior without requiring special take-off techniques.
Landing
No special techniques were needed for landing.
Speed in Straight Flight
The trim speed exceeded 30 km/h, with a control speed range greater than 10 km/h. Minimum speed varied between less than 25 km/h and 25-30 km/h.
Control Movement
For weights over 100 kg, symmetric control pressure/travel increased to more than 65 cm.
Pitch and Roll Stability
Pitch stability during accelerated flight was not available, while roll stability showed reducing oscillations.
Spiral Dive Behavior
Exiting a fully developed spiral dive resulted in an immediate reduction in the rate of turn and a spontaneous exit.
Symmetric Front Collapse
Recovery was spontaneous in less than 3 seconds with a dive forward angle of 0° to 30° while maintaining course.
Asymmetric Collapse
Small collapses resulted in less than 90° change of course with spontaneous re-inflation, while large collapses showed a 90° to 180° change of course.
Directional Control
Maintained asymmetric collapse allowed for course keeping and 180° turns within 10 seconds.
Spin and Stall Recovery
No spin occurred at trim or low speeds, and recovery from developed spins stopped in less than 90°.
Additional Procedures
Big ears entry and recovery were stable and spontaneous, with alternative directional control allowing for 180° turns in 20 seconds without stall or spin.
Test Report Summary
General Information:
  • Class: B
  • Model: Bi 4 2
  • Manufacturer: Sky Paragliders a.s.
  • Serial Number: 2257-11-1209
  • Date of Issue: 30.01.2018
Flight Test Configuration:
  • Maximum Weight in Flight: 220 kg
  • Minimum Weight in Flight: 120 kg
  • Glider's Weight: 7.9 kg
  • Projected Area: 36.79 m²
  • Number of Risers: 4
  • Harness Type: ABS
  • Harness Brand: Advance
  • Harness Model: Bi pro 2
  • Harness to Risers Distance: 44 cm
  • Distance Between Risers: 55 cm
Flight Test Results:
  • B-line Stall: Stable with spontaneous recovery in less than 3 seconds, dive forward angle 0° to 30°.
  • Big Ears: Stable flight with spontaneous recovery in less than 3 seconds, dive forward angle 0° to 30°.
  • Big Ears in Accelerated Flight: Not available.
  • Alternative Means of Directional Control: 180° turn achievable in 20 seconds, no stall or spin occurs.
  • Other Flight Procedures: Not available.
Standards Compliance:
  • EN 926-2:2013
  • EN 926-1:2015
  • LTF 91/09
Additional Notes:
  • Test report generated automatically by AIR TURQUOISE SA, valid without signature.
  • Warning: Before use, refer to the user's manual.
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Catalog excerpts

Bi 4 2-1

AIR TURQUDI5E 5A I PARA-TE5T.COM Route du Pre-au-Comte 0 * CH-1B44 Villeneuve * .41(0)21965 65 65 Test laboratory for paragliders, paraglider harnesses and paraglider reserve parachutes Manufacturer Address Sky Paragliders a.s. Okruzm 39 73911 Frydlant nad Ostravici Czech Republic Certification number Date of flight test Glider model Serial number Trimmer Folding lines used Bi 4 2 2257-11-1209 yes: closed no Test pilot Harness Harness to risers distance (cm) Distance between risers (cm) Total weight in flight (kg) Classification Representative Place of test Thurnheer Claude Advance - Bi pro 2 44 55 120 1. Inflation/Take-off Rising behaviour Special take off technique required Smooth, easy and constant rising 2. Landing Special landing technique required 3. Speed in straight flight Trim speed more than 30 km/h Speed range using the controls larger than 10 km/h Minimum speed Max. weight in flight up to 80 kg Symmetric control pressure/travel not available 0 not available 0 Max. weight in flight 80 kg to 100 kg Symmetric control pressure/travel not available 0 not available 0 Max. weight in flight greater than 100 kg Symmetric control pressure/travel Increasing / greater than 65 cm A Increasing /greater than 65 cm A 5. Pitch stability exiting accelerated flight 0 Dive forward angle on exit not available 0 not available 0 Collapse occurs not available 0 not available 0 6. Pitch stability operating controls during accelerated 0 flight Collapse occurs not available 0 not available 0 7. Roll stability and damping A Oscillations Reducing A Reducing A 8. Stability in gentle spirals Tendency to return to straight flight 9. Behaviour exiting a fully developed spiral dive Initial response of glider (first 180°) Tendency to return to straight flight Spontaneous exit A Spontaneous exit A Immediate reduction of rate of A Immediate reduction of rate of turn A turn Spontaneous exit (g force A Spontaneous exit (g force A decreasing, rate of turn decreasing, rate of turn decreasing) Test Report generated automatically by AIR TURQUOISE SA, valid without signature // GB | REV 04 | 07.06.2016 // ISO | 71.8.2 // Page 1 of 4

 Open the catalog to page 1
Bi 4 2-2

Turn angle to recover normal flight Less than 720°, spontaneous A Less than 720°, spontaneous A recovery recovery 10. Symmetric front collapse Rocking back less than 45° A Spontaneous in less than 3 s A Dive forward 0° to 30° Keeping A course No A No Rocking back less than 45° A Spontaneous in less than 3 s A Dive forward 0° to 30° / Keeping A course No A Approximately 30 % chord Entry Recovery Dive forward angle on exit Change of course Cascade occurs Folding lines used At least 50% chord Entry Recovery Dive forward angle on exit / Change of course Cascade occurs Folding...

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Bi 4 2-3

Collapse on the opposite side occurs No (or only a small number of A collapsed cells with a spontaneous reinflation) No (or only a small number of A collapsed cells with a spontaneous reinflation) Twist occurs Cascade occurs Folding lines used Small asymmetric collapse with fully activated accelerator Change of course until re-inflation / Maximum dive forward or roll angle Re-inflation behaviour Total change of course Collapse on the opposite side occurs Twist occurs Cascade occurs Folding lines used not available not available not available not available not available not available Not available...

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Bi 4 2-4

Test Report generated automatically by AIR TURQUOISE SA, valid without signature // GB | REV 04 | 07.06.2016 // ISO | 71.8.2 // Page 4 of 4

 Open the catalog to page 4
Bi 4 2-5

AIR TURQUDI5E 5A I PARA-TE5T.COM Route du Pre-au-Comte 0 * CH-1B44 Villeneuve * .41(0)21965 65 65 Test laboratory for paragliders, paraglider harnesses and paraglider reserve parachutes Manufacturer Address Sky Paragliders a.s. Okruzm 39 73911 Frydlant nad Ostravici Czech Republic Certification number Date of flight test Glider model Serial number Trimmer Folding lines used Bi 4 2 2257-11-1209 yes: opened no Test pilot Harness Harness to risers distance (cm) Distance between risers (cm) Total weight in flight (kg) Classification Representative Place of test Thurnheer Claude Advance - Bi pro 2 44 55 120...

 Open the catalog to page 5
Bi 4 2-6

Turn angle to recover normal flight Less than 720°, spontaneous A Less than 720°, spontaneous A recovery recovery 10. Symmetric front collapse Rocking back less than 45° A Spontaneous in less than 3 s A Dive forward 0° to 30° Keeping A course No A No Rocking back less than 45° A Spontaneous in less than 3 s A Dive forward 0° to 30° / Keeping A course No A Approximately 30 % chord Entry Recovery Dive forward angle on exit Change of course Cascade occurs Folding lines used At least 50% chord Entry Recovery Dive forward angle on exit / Change of course Cascade occurs Folding...

 Open the catalog to page 6
Bi 4 2-7

Collapse on the opposite side occurs No (or only a small number of A collapsed cells with a spontaneous reinflation) No (or only a small number of A collapsed cells with a spontaneous reinflation) Twist occurs Cascade occurs Folding lines used Small asymmetric collapse with fully activated accelerator Change of course until re-inflation / Maximum dive forward or roll angle Re-inflation behaviour Total change of course Collapse on the opposite side occurs Twist occurs Cascade occurs Folding lines used not available not available not available not available not available not available Not available...

 Open the catalog to page 7
Bi 4 2-8

Test Report generated automatically by AIR TURQUOISE SA, valid without signature // GB | REV 04 | 07.06.2016 // ISO | 71.8.2 // Page 4 of 4

 Open the catalog to page 8
Bi 4 2-9

AIR TURQUOISE SA I PARA-TE5T.CDM Route du Pr£-au-Comte 8 * CH-1844 Villeneuve * .41(0)21965 65 65 Test laboratory for paragliders paraglider harnesses and paraglider reserve parachutes Manufacturer data Manufacturer name: Representative Street: Post code / place: Country: Sample data Name: Min weight in flight [kg]: Weight [kg]: Sample load serial number: Sample flight serial number: Test report summary 71.8.3 | Shock loading test: 71.8.3 | Sustained loading test: 71.8.2 | Flight test: 71.4.3 | Measurement: 71.6.3 | Line bending test: Sky Paragliders Nemec Martin Okruzni 39 73911 Frydlant N.C. Czech...

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