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BHL5
BARRETINA HYPER LITE 5
  
BHL5

BHL5
Figure 1. Planform 3D view

BHL5
Figure 2. 3D view

1. DESCRIPTION

BHL5 is a single skin paraglider with a 5.66 aspect ratio (same as BHL3). With profiles, solutions, and details very similar to the BHL4, but with a more elongated shape in plan, and 39 panels instead of 35, and thinner profiles in central part. An improved substitute of the BHL2, using the experiences adquired with previous monosurfaces. The shape of the profile is the same as BHL2, but with a different distribution of triangles and thickness. 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 and BHL4. 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 is 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 and efficient  performance single skin paraglider.

2. TECHNICAL ESPECIFICATIONS BHL5


XXS
XS
S
M
M-L
Bi
Model
BHL5-16
BHL5-18
BHL5-20
BHL5-22
BHL5-24
BHL5-33
Surface
16.00 m2
18.00 m2
20.00 m2
22.00 m2
24.00 m2
33.00 m2
Flat span
9.51
10.09
10.63 m
11.15 m
11.65 m
13.66 m
Flat AR
5.66
5.66
5.66
5.66
5.66
5.66
Panels
39
39
39
39
39
39
Closed cells
2 in wingtip, with one elliptical inlet
Weight range
-
Anchors per rib
5, 4, and 3 (near tips)
Risers
4
Top surface
ripstop 40 gr/m2
Ribs
ripstop 40 gr/m2 hard
Certification
No


3. DATA FILES AND PLANS

LEparagliding-3.11 input and output files and DXF files:

pre-procesor and leparagliding
data files
pre-data.txt  leparagliding.txt
Airfoils
bhl-5p.txt  bhl-4p.txt bhl-3p.txt bhl-tube.txt
Output txt files
lep-out.txt lines.txt
PDF descriptive plans
BHL5-16 BHL5-20 BHL5-24
 BHL5-33
PDF patterns to print A4
BHL5-16 (A4) BHL5-20 (A4) BHL5-24 (A4)
All files in one zip including DXF plans
BHL5-16.zip (version 20201208)
BHL5-20.zip (version 20201208)
BHL5-24.zip (version 20201208)
BHL5-33.zip (version 20211114)

Skin tension law
Figure
3. Skin tension law data.txt gnuplot


Figure 4. Airfoils
bhl-5p
bhl-4p
bhl-tube


4. CONSTRUCTION

In May 2022, at least four prototypes have been completed:

BHL5-16-HA byThierry Bosq
BHL5-16-TA by Eric Fontaine
BHL5-24 成都 "Chengdu", by Zhu Guoqiang
BHL5-16 "Limetti" by Tim Weber
BHL5-24 山东 "Shandong"

5. NOTES




5. ADJUSTMENT NOTES 2022-09-25

The calage calage of this paraglider has been initially set at 30%. This is a very forward calage. Optionally, it can be moved a little further back as some builders have done. By moving the calage backwards, we lose speed but gain stability at the leading edge and a better sink rate.

Examples:

BHL5-16-HA 30%
BHL5-16-TA 42%
BHL5-24 成都 30%
BHL5-16 "Limetti" 35%
BHL5-24 山东
34%

add
Example: How to modify the risers, to go from 30% to 34% in the 24 m2 model.
For an even more precise fit. All suspensions must be recalculated. Ask.

 c) Trimer system pivot in first riser:
 -------------------------------------------
 i   alpha       A       B       C       D  Calage
 1    0.00    0.00    0.00    0.00    0.00   30.00
 2    0.12    0.00   -0.11   -0.21   -0.35   30.58
 3    0.24    0.00   -0.22   -0.43   -0.70   31.15
 4    0.36    0.00   -0.33   -0.64   -1.05   31.73
 5    0.48    0.00   -0.44   -0.85   -1.40   32.31
 6    0.60    0.00   -0.55   -1.07   -1.75   32.88
 7    0.72    0.00   -0.66   -1.28   -2.10   33.46
 8    0.84    0.00   -0.78   -1.49   -2.45   34.04
 9    0.96    0.00   -0.89   -1.71   -2.80   34.61
10    1.08    0.00   -1.00   -1.92   -3.15   35.19
11    1.20    0.00   -1.11   -2.14   -3.50   35.77
12    1.32    0.00   -1.22   -2.35   -3.85   36.34
13    1.44    0.00   -1.33   -2.56   -4.20   36.92
14    1.56    0.00   -1.44   -2.78   -4.55   37.50
15    1.68    0.00   -1.55   -2.99   -4.90   38.07
16    1.80    0.00   -1.66   -3.20   -5.25   38.65
17    1.92    0.00   -1.77   -3.42   -5.60   39.22
18    2.04    0.00   -1.88   -3.63   -5.95   39.80
19    2.16    0.00   -1.99   -3.85   -6.30   40.37
20    2.28    0.00   -2.10   -4.06   -6.66   40.95
21    2.40    0.00   -2.22   -4.27   -7.01   41.52
22    2.52    0.00   -2.33   -4.49   -7.36   42.10
23    2.64    0.00   -2.44   -4.70   -7.71   42.67
24    2.76    0.00   -2.55   -4.91   -8.06   43.25
25    2.88    0.00   -2.66   -5.13   -8.41   43.82
26    3.00    0.00   -2.77   -5.34   -8.76   44.40


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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