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BHL2-16 JM
BARRETINA HYPER LITE 2 SIZE 16 m2

This single skin paraglider prototype was constructed by Julien Millot, in Annecy (France).
About the constructor: Slack.fr - Skyliners Team

BHL2 16 m2 Slack
Winter 2017, tests using new brake lines

BHL2-16 Slack vol 2
Some maneuvers. Test flight 21 january 2017.


BHL2 16m2 - 1er gonflages from Julien Millot on Vimeo.

1. Technical specifications BHL2-16 JM

Model
BHL2 16 m2
Surface
16 m2
Flat span
8.91 m
Flat AR
5
Panels
33
Weight range
-
Anchors per rib
4, and 3 (near tips)
Risers
3
Top surface
Skytex 27 gr/m2
Ribs
Skytex 32 gr/m2 hard finish
Certification
No


2. Development and plans

- This paraglider plans have been generated by the designer/manufacturer using the version of LEparagliding 2.35 compiled on a Mac OSX using gfortran.
- The
base file used is
leparagliding.txt using main scale factor of k=0.836.
- For templates in A4 format, PDFs were generated  using the program LibreCAD.

Plans 2D DXF 2000 format
BHL2-16 2D                                     
Plans 3D DXF 2000 format
BHL2-16 3D
Line list in .xls format, including
experimental corrections

Lines.xls                            
PDF views (lines)

LEparagliding 2.35 main data file
leparagliding.txt
bhl2 4 anchors sawtooth airfoil bhl2_01.txt 
bhl2 3 anchors sawtooth airfoil bhl2_15.txt
bhl2 zero thickness airfoil bhl2_17.txt
txt output
lep-out.txt 

3. Construction

This prototype is now constructed (October 2014), by Julien Millot in lac d'Annecy (France).
Now, testing the prototype.



Capture d'ecran
1. Julien begins the design compiling the leparagliding source code with gfortran in
a Mac
OSX computer.
After introducing the parameter 0.836 for the desired surface, program generates the output files. One of the first difficulties is finish adjusting
DXF
files generated, using a CAD program.
The fabric covers of air intakes,
are already included in the top drawn panels
?
sk panel formation
2.
Explanation of how put together (in CAD), covers of the air intakes with the rest of the top surface of the SK panel.
Test 2
3. Test 2 assembly in Millot's Atelier: load into triangles.
Before deciding
the final method of sewing and reinforcement to apply,
is always interesting
perform destructive
experiments with full
scale samples.
Avant
4. Triangle row "B", model. Before test.
Mylar reinforcement radius is 6 cm.

All these experiments, although simple, and although not exactly
reflect
the real situation, are VERY interesting.
It is recommended that
all builders do similar tests,
with
the most important structural elements of the wing
.
Avant
5. Test 2 triangle after experiment.
21kg
before the first deformation, 32kg break.
The mylar seam loop is intact.
The rupture
took place between the mylar and
Skytex the zigzag stitching.
Slight
dyssimétrie support
.

Notes
6. Some options to improve the results of experiments.
Avant
7. Test 3, before.

Mylar reinforcement radius is 7 cm.



Full load
8. Test 3, full load.
Break
9. Test 3. Breaking load 48kg on the zigzag stitching at the center of ripstop first.

That
is enough?
The rule:

"Lines (A1 + A2 + B1 + B2) x 2, should hold 8 times the weight in flight."

Means that a in balanced flight, in "C" and "D" rows is almost no load,
and
A3 and B3 have very little... Then only the four main lines
of each side ((A1 + A2 + B1 + B2) x 2) should hold the full load
test
of 8G. In our case (BHL2) we have 9 anchors in A1 + A2,
and
also 9 for B1 + B2. This is (9 +9) x2 = 36 for both sides.
36 x
48 = 1728 Kg! > 100x8 = 800 Kg
OK! But it is always prudent to oversize even more!
Apres
10. Test 3 sample, after experiment.
74
11. First two panels and rib, ready to sew. Start sewing!
First, is necessary
to sew all the reinforcements and sawtooth edges of the ribs.
74
12. First panels sewn.
74
13. Nose detail
74
14. Nylon rod inserted in the special "pocket" of the nose.
74
15. "A" - end of rod detail
74
16. End of the rod, softened with heat to round shapes
74
17. The other end of the nylon
74
18. Cela commence ŕ ressembler ŕ une aile monosurface!
This is starting to look like a single skin wing!


All photos by Julien Millot

BHL2 16 m Slack
Flights winter 2017

LAB NOTE: Build a paraglider at home is a very complicated task (even simple skin), and requires many hours of work. Previous experience is required, and very inventive. As always remember that: The free flight implies risks that can only be known and they can be controled with a suitable formation on the part of a recognized school. Not test wings without knowing their functioning. The construction and test of experimental wings without certifying requires deep knowledge of what is being made.

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