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BHL4
BARRETINA HYPER LITE 4 size 24 m2
BHL4
Figure 1. Planform 3D view

BHL4
Figure 2. 3D view

1. DESCRIPTION

BHL4 is a single skin paraglider with a moderate 4.69 aspect ratio. An updated and improved version of the BHL1 (Batlite), using the experiences adquired with previous monosurfaces. The shape of the profile is the same as BHL2, but with a different distribution of triangles. In this case, we use 5 points of suspension for the profile, with the intention to better define the trailing edge. There are two closed cells near the wingtips with an elliptical inlet as BHL2-evo. The shape of the vault is the same as BHL3. The list of lines proposed initially is the one that comes out of the program, without modify. The nose  will be rigidified with two rods (contour and vertical compresion rod). The skin tension will be increased with a variation more pronounced between centre and extremes, and more smooth (using a new subroutine for skin tension). Finally, the brakes will be fixed to the trailing edge with a small "V" ribbon, to shorten the trailing edge when braking and eliminate part of the ovalization and creating a more defined flap. All of these details should provide a simple, efficient and fun single skin paraglider. Using the same solutions, but with a more elongated planform, there is the BHL5.

2. TECHNICAL ESPECIFICATIONS BHL4


M-L
Model
BHL4 24 m2
Surface
24.04 m2
Flat span
10.62 m
Flat AR
4.69
Panels
35
Closed cells
2 in wingtip, with one elliptical inlet
Weight range
-
Anchors per rib
5, and 4 (near tips)
Risers
4
Top surface
ripstop 40 gr/m2
Ribs
ripstop 40 gr/m2 hard
Certification
No


3. DATA FILES AND PLANS

LEparagliding-2.96 input and output files. DXF files without editing, as they come out of the program. This version can be built, but I recommend to wait a few days... to complete some important details: vertical rods in the leading edge (to increase rigidity), the new distribution of tension of skin (this can be fundamental for the performance), nose with two 3D cuts, "V" ribbons in brakes, and two wingtip intrados panels.

pre-procesor and leparagliding
data files
pre-data.txt  leparagliding.txt
Airfoils
bhl-5p.txt  bhl4-4p.txt  bhl-tube.txt
Output txt files
lep-out.txt lines.txt
All files in one zip including DXF plans
BHL4.zip  (version 20190510)


Airfoils
bhl-5p
bhl-4p
bhl-tube


4. CONSTRUCTION

Currently, there is no prototype in construction, although there is already a german constructor interested. News soon.


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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