Rupture of the weak link during a mast-based launch attempt of the V3 kite

Video in TIB AV-Portal: Rupture of the weak link during a mast-based launch attempt of the V3 kite

Formal Metadata

Rupture of the weak link during a mast-based launch attempt of the V3 kite
Video recorded on 2 August 2012 with a GoPro camera on the ground next to the launch mast
Title of Series
Wachter, Aart de (ground station operator)
Vlugt, Rolf van der (kite pilot)
Fechner, Uwe (control system)
Ulyashyn, Sergiy (electronics)
Heuvel, John van den (ground crew)
Haug, Stefan (ground crew)
Franca, Bryan (ground crew)
CC Attribution 4.0 International:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
Release Date
Original sound, no spoken text
Schmehl, Roland
Production Year
Production Place
Former naval airfield Valkenburg, Leiden, Netherlands

Content Metadata

Subject Area
The video recording shows an attempted launch of the TU Delft V3 kite from an upside-down hanging position on 2 August 2012 at the former airfield Valkenburg, Leiden, Netherlands. While the upswing of the kite towards the upright position proceeds well, the tether suddenly disengages from the mast head (15 s into the video) and the resulting lash leads to an overloading and breaking of the weak link, located just below the kite control unit. As a result, the pulling force of the detached kite immediately shifts to the safety line, which at this point in time remains the only physical connection between the kite and the tether. The sudden force increase in this line activates the integrated progressive-tearing energy absorber, which is visible from the scattering fabric debris (starting at 16 s into the video) and the kite rapidly drifting out of the field of view. This launch attempt was also covered by data recording, by a regular photo camera and by a second GoPro video camera that was taped to the leading edge tube of the kite, looking down at the kite control unit. The remaining course of events can be reconstructed from the additional photo footage: with the sudden break of the weak link, the kite control unit is catapulted in radial direction towards the wing and eventually caught by the bridle line system. This ballistic event leads to an irreversible collapse of the wing. Secured by the safety line, the parachute-like assembly of curled-up wing and kite control unit slowly descends and hits the ground about 27 s into the video. Because the time setting of the GoPro video camera was incorrect, the time information in the metadata was synchronized with the absolute time available from the data recording. The creation date of the video was set to the launch time 18:27:18 such that the weak link ruptures about 16 s later, at 18:27:34.
Keywords Airborne Wind Energy Kite Power Kite Launch Airfield Valkenburg

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AV-Portal 3.19.2 (70adb5fbc8bbcafb435210ef7d62ffee973cf172)