Although South Africa (SA) is currently ranked amongst the top in the world regarding Covid-19 active cases, we are very grateful to report that the effects of the virus have not affected employees of Jonker Sailplanes. JS has taken all the necessary steps to ensure reduced risk of infection under employees, and not one Covid case has&nb …
Opening the molds for the first time it is like opening a treasure box. You expect something amazing – the result of years of design and many weeks of construction, revealing its BEAUTY. It is an amazing feeling for everyone involved seeing the real product matching the expectation the CAD models promised. …
This week we saw a giant leap towards the completion of the REVENANT. After many weeks of accurately positioning components in the fuselage, verifying computer models and making small design changes, the JS2 fuselage was ready to be closed.JS spend a huge amount of engineering time to construct highly accurate tooling – this to ensure that se …
Congratulations to Martti Koivula who reigned as the Fin open class nationals champion flying his JS1 “GOL”. Martti Koivula with his JS1 The competition consisted out of 17 Competitors and took place from the 18th July to 25h of July. JS1 “GOL” in action Thank you for the pictures Martti, hope you have many more great and enjoya …
LSG Waterkant-Zetel e.V. received their JS3, serial number 83, on the 18th of June. They send to us some very uplifting words which we would like to share: “Thank you very much, Jonker Sailplanes and M&D Flugzeugbau for our new Aircraft. This weekend (26th to 28th of June), the first members of our club had the chance to experience their fi …
Congratulations to Riccardo Brigliadori for winning both the Coppa Città di Ferrara 2020 and the Campionato Italiano Classe UNICA 2020 in his JS1C -21m! Both competitions were held from the 26th of June – 5th July 2020 in Ferrara Italy. Also congratulations to David Schiavotto and Roberto Pinato! David finished strong with a 2nd position in t …
The latest issue of the gliding magazine SEGELFLIEGEN has just been dispatched to shops in Germany and Austria. This issue covers the 2020 Helli Lasch Challenge in the 5-star game lodge TSWALU, South Africa where some of the world’s top glider pilots enjoyed a week of luxury gliding. The front page picture of a jet equipped JS3-18m over Hamburg …
For those who missed the link in our latest newsletter, here is a copy of the article… Weight and balance is such a critical flight safety component – so often neglected by many of us aviators. Just imagine that the complete weight of an aircraft in flight is carefully balanced somewhere around the main wings, with a small tailplane a few meter …
Why did you select a high-wing configuration on the JS3? Top performance sailplanes essentially must have the ability to climb and cruise better than its competitors. This implies that winning gliders have to be efficient flying machines at both low and high flight speeds which are, in many cases, contradictory design specifications. All parts …
The #JS5 wing has 2 sections per side with a removable winglet (as strongly recommended by Cobra trailer design team). The 4 flaps per side are driven by 4 drivers, as the aerodynamic twist associated with these long wings could just not be structurally designed out. Intensive wing and flap twist modulations were performed to ensure we de …
The image shows a flow field around a wing tip without a #winglet . More precisely, it shows the extent of positive inflow angles at the tip region. The addition of a winglet would utilize this flow field and increase performance, only if it is inside the boundary of positive inflow angles. At higher flight speeds, the positive-inflow-angle flow fie …
JS is expanding its product range and plans to release a product in the standard class – the JS4. It is important to have the “voice of the customer” early in the design phase, to ensure we specify a product meeting our customer’s needs. We need to understand who has interest in our new products, what configurations are important and what powe …
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