Uys Jonker at Sustainability Conference 2015, NCPC

1. BORN FROM A DREAM…
A Revelation….

3. The JS1 design started most probably in the mid 1970’s ……..
Attie Jonker
(Chief Design
Engineer)

4. … inspired by the construction of wooden glider, built
somewhere in a shack in Africa…
Tienie Jonker
(Dad and Chief
Inspirer)
 .

5. …and while Tienie assembles under the shade of our grape
arbor…
Tienie reaming
main pins

6. …. the boys paid attention to all detail …polishing their
finishing skills….
Attie
Uys

7. …. with the aim to develop the most sought after
sailplane in world.. …

8. ……three passionate enthusiasts….
Attie
Uys
Johan Bosman
(Bossie)

9. And now….30 years later…..
What realised from this dream?

10. Over 100 products are sold worldwide….
Thank you very much ladies and gentlemen….
Any questions??

11. • The JS1 won a National Gliding Championship in
every country sold:
South Africa (9x already)
USA
United Kingdom
Netherlands
France
Poland
New Zealand
Australia
Slovenia

12. • The JS1 was already seven times on the World
Gliding Championships podium:
JS1-18 m class
Hungary 2010 : Silver
USA : Bronze
Poland 2014 : Bronze & Silver
JS1-21 m Open class
USA 2012 : Silver
Poland 2014 : Bronze & Silver

14. Over 100 fulltime employees

15. The only Type Certified Aircraft
designed and manufactured in Africa
v

16. But why??

17. When the modern glass gliders were released in the 1970’s,
the Tern just didn’t look right….

18. “Chief Design Engineer to be”
wasted no time …..
He immediately started redesigning
a slick aerodynamic shell that he will
stick around the FatTern.
But sadly he realised that he lacked a few critical skills,
including aerodynamics and structures….
the sole reason why he enrolled as an Engineering student
…8 years later….

19. So…
What did we do to make the
best sailplane in the world ?

22. Requirements to design the ultimate sailplane:

23. Requirements to design the ultimate sailplane:
Cruise ability
• glide angle at various speeds
Climbing ability
• to able climb as fast as possible in thermals

24. The birth of the JS1’s T12 Profile:
We develop the best low-speed laminar
airflow in the world

25. “We designed the best plan form possible for climbing”

26. Wing root optimization:
We used modern design
software to optimised the
wing-fuselage junction

27. The wing-winglet section was
design with 3rd generation
CFD methods

28. Fuselage design : Shape
We design a fuselage using the latest CFD
methods available…..doing all wind-tunnel
simulation with computers…

29. Fuselage design : Structure
Structural designs were verified with
FEMM analysis

30. Design method verification
• ComparedANSYS result with measured results

31. Manufacturing
CNC-machined manufacturing

32. Manufacturing
Machining of mouds:

33. Manufacturing
CNC-machined manufacturingMachining of positives shapes ”plugs” to make production moulds:

34. Manufacturing
CNC-machined manufacturing

35. Manufacturing
CNC-machined manufacturing

36. Manufacturing
CNC-machined manufacturing

37. Manufacturing
CNC-machined manufacturing

38. And then, a fantastic day, 6 December 2006,
the roll- out of the JS1 Revelation
The JS1 Revelation
Revelation 4:11
CNC-machined manufacturing

40. The JS1 is the only type certified
aircraft of South Africa

41. Static load test
Static test video

43. Developed a mobile data acquisition system for flight
testing
Development of a mobile data
acquisition system for flight testing
Video: Spinning

45. Single Switch Operation

47. Development of a mobile data
acquisition system for flight testing

48. Development of a mobile data
acquisition system for flight testing
JS and M&D Flugzeugbau signed a partnership agreement

49. • We had a vision, and we did not get distracted
• We base all our decisions to achieve this goal
• We made huge sacrifices….
• We live in country with opportunities and
government funding models available

50. • Were successful with grant applications from
• the dti (THRIP) with the NWU as research partner
• Participated in technology projects
• DST (ATMS project)
• the dti (National Aerospace Centre)

51. • Live your dream
• Believe in yourself
• Take opportunities
• Work hard
….and you will make a difference
in the lives of other people…..

52. The performance is unbeatable….
…..the experience a Revelation….