Met onder andere: Down Under deel 3 | Lauterbrunnen Ferrata&fly | Rugprotector anders getest | Delta Ludesch Open | Delta Knoalcup 2026 | Forbes Flatlands |

Als het kraakbeen in je knie of heup kapot is loop je met pijn. Daar hebben tienduizenden Nederlanders elk jaar last van. Een nieuwe heup of knie, een prothese, gaat gelukkig tientallen jaren mee. Hoe is dat gelukt? Waar is zo'n kunstgewricht van gemaakt? En is de operatie wel veilig?
Dit artikel werd gepubliceerd als CF Editie 111, nummer 426, juni 2026 (voorheen Chemische Feitelijkheden)

Back in the day, the nineties and early 2000s, the choice was easy. Most brands had one glider in the intermediate class, what is now known as EN or LTF-B. This type of glider was the one pilots got after training, or even during training. But now, most brands have more than two gliders in the B-class. Is there such a thing as a mid-B?
This feature was published in Cross Country magazine 266, July 2026.

(Photo: Mid-B Ozone Vibe GT, Ozone/Antoine Boisselier)

From SWI: "The Study Group Mathematics with Industry (SWI) is a combined industrial–academic week-long workshop sponsored by NWO. Roughly seventy mathematicians work in groups on problems submitted by companies. Companies present a selection of problems on Monday. The participants devote the entire week to studying these problems in smaller groups and present their results on Friday."

BMedia was responsible for writing the popular proceedings.
(Beeld: ADC Consulting)

The reflex profile is as old as the earliest aircraft. A century ago, designers started using an airfoil with the trailing edge curved up to increase the safety and stability of early aircraft. When the first paragliders came along in the late seventies and eighties, a reflex profile wasn't the obvious choice because it meant increased sink over other airfoil shapes. Early pilots just wanted to stay airborne.

The way our harnesses are tested for strength and safety is getting an update. By the end of the year, a group of harness experts including Alexandre Jofresa from Air Turquoise will propose a new EN standard. Alexandre explains: "We want to include a new impact pad test for harness back protection which drops the harness at a 75 degree angle. This simulates you are falling almost flat on your back."
(Photo: Air Turquoise/Harley Chesnel).

Met onder andere: Down Under deel 2 | Parakiting.nl | Slepen met een drone | Interview: Yan Disselhorst | Vliegen in de Balkan | Via ferrata & fly bij de Dachstein | De veiligheidscultuur bij paragliding

Ze wegen nog geen 100 gram – de twee karabiners die ons, via het harnas, met de vleugel verbinden. Maar ze zijn cruciaal. Als er één in de lucht bezwijkt, volgt onvermijdelijk een rit aan je reserve. Bijzonder eigenlijk dat de karabiner het enige onderdeel van onze uitrusting is waarvoor géén officiële norm geldt. Tijd voor wat extra aandacht voor de karabiner.
Foto: neo-paragliders.fr

"I'm telling that you don't need more than an EN-A wing in all your flying career!" Hannes Papesh, founder of Phi paragliders, is clearly a fan. In their range, Phi have eight different EN-A gliders.
Traditionally, the EN-B class got the biggest slice of the market. But this is changing, confirms designer Philipp Medicus from Nova: "EN-A has grown to be similar to B."

Met onder andere: Down Under deel 1 | Hut&Fly | Serie harnassen deel 5: karabiners | Interview: Robbin van Herwaarden, Skymonkey paramotors | SIV nieuwe stijl | Vliegstekkengids Turkije | Recensie: Wanderbird Strategy van Paul Guschlbauer | Deltavliegen in Denemarken en Kroatië | Interview: Josh en Kanan van Escape paragliding.