le-ge
[en] [de] [fr]
BHL5-16 "LIMETTI"
BARRETINA HYPER LITE 5
1
 2
Figure 1. BHL5-16 "Limetti"


1. DESCRIPTION

BHL5-16 SA is the BHL5 single skin prototype made by Tim Weber in Sauerland, Germany. Completed in April-May 2022.

" Here are a few more information about my proto from the BHL5.
I used Skytex 27/g m2 for the cells and triple kite ripstop 51g/m2 for the ribs.
The Lines are Liros DC (Dyneema coated) 60 for the upper gallery 160 middle gallery  200 for the main lines.
2,4 mm nylon rods from the garden strore for weedeater
10mm wide belts for the line attachment points .
The line attachment points are reinforced with self adhesive cordura 170g/m2.
The yarn is Serafil S80 and i used almost 1500m of it
My versoin of the proto has the name  - LIMETTI -
Without lines it weights 1605 g and with the lines 1850g
 The trailing edge is reinforced with 65g/m2  25mm wide ripstop and the leading edge is reinforced with 1mm aramide chord."

2. PLANS AND ADJUSTEMENT NOTES

Tim's prototype has been built according to the plans BHL5 version 20201208.

The first flights are done usin a calage of 30%. Later, and according to my suggestions, Tim did some experiments modifying the risers lengths.
For example, to change from 30% to 42% it is necessary extend riser A in 5.9 cm extend riser B 4.1 cm, extend riser C 2.4 cm, riser D unchanged.
Finally, the adjustment made by Tim is as follows (june 2022):

" I decided to try it with the A riseres at 50cm
                                         B s              49cm
                                         Cs               48cm
                                         Ds               47cm

I dont know how to do the maths and how many percent calage this is :D But it flies really good.
its a lot faster than the 42% and i think a little bit more stable that the 30%.
It has no tendence to stall while groundhandling and i managed to soar the wing at 35kph wind :D "

Based on Tim's experimental adjustments we can deduce that his current calage is 36%, as can be verified in the calage variation tables generated by the LEP program:

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    0.25    0.00   -0.19   -0.36   -0.61   31.22
 3    0.50    0.00   -0.38   -0.73   -1.21   32.44
 4    0.75    0.00   -0.57   -1.09   -1.82   33.66
 5    1.00    0.00   -0.75   -1.45   -2.43   34.88
 6    1.25    0.00   -0.94   -1.82   -3.03   36.10
 7    1.50    0.00   -1.13   -2.18   -3.64   37.31
 8    1.75    0.00   -1.32   -2.54   -4.25   38.53
 9    2.00    0.00   -1.51   -2.91   -4.86   39.75
10    2.25    0.00   -1.70   -3.27   -5.47   40.96
11    2.50    0.00   -1.88   -3.63   -6.07   42.18
12    2.75    0.00   -2.07   -4.00   -6.68   43.39
13    3.00    0.00   -2.26   -4.36   -7.29   44.61
14    3.25    0.00   -2.45   -4.73   -7.90   45.82
15    3.50    0.00   -2.64   -5.09   -8.51   47.03
16    3.75    0.00   -2.83   -5.45   -9.12   48.25
17    4.00    0.00   -3.01   -5.82   -9.74   49.46
18    4.25    0.00   -3.20   -6.18  -10.35   50.67
19    4.50    0.00   -3.39   -6.55  -10.96   51.88
20    4.75    0.00   -3.58   -6.91  -11.57   53.09
21    5.00    0.00   -3.77   -7.27  -12.18   54.30

Limetti lep files:
leparagliding.txt (version 3.19 and 36% calage)
bhl-5p.txt bhl4-4p.txt bhl3-3p.txt bhl-tube.txt
lines-30%.txt lines-36%.txt lines-42%.txt


3. PHOTOS AND VIDEOS


Construction and first flights


Many thanks to Tim Weber for sharing the details of his project!


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.