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LEHANGGLIDING 0.05

USER MANUAL

LEhanggliding is a parametric program for delta wing designs. All delta wing parameters are defined in a text file named lehanggliding.txt, and in other additional profile files, all in txt format. The results of the program will be represented in a series of drawings in DXF format and some listings in .txt format. To write the data file, you must strictly follow the instructions in this manual, and the drawings that represent each of the parameters, which will be published soon, at the same time as the program is developed.

The objective is to demonstrate that the delta wing can be easily parameterized in a set of parameters. Each set of parameters will define a delta wing. It is planned to design any type of delta wing from one Rogallo wing to one topless with elliptical tips and sprogs. A second objective is to review the delta wing design criteria, and make them public.

The program is currently nothing, it does not exist... First we write the data structure of the parameters file. This is the most important. Then we will write a subroutine that reads the data and starts drawing things.

Let's see the data structure of the first version, and its interpretation:

***********************************************************************
* LABORATORI D'ENVOL HANG GLIDING DESIGN PROGRAM                      *
***********************************************************************
Version 0.05
Name "Pi de l'Indią"
Date "2018-07-08"
***********************************************************************
*  1. MAIN  DATA
***********************************************************************
* Brand name
"LABORATORI D'ENVOL"
* Wing name
"gnuSTRATUS"
* Type
5
* Drawing scale
1.0
* Wing scale
1.0
* Nose angle
135
* Leading edge
580
* Keel
350
* Boom
100
* Crossbar
2
330 180
* Triangle
2
130 165 0.0 190 85
* Kingpost
1
110 190 90
* Fin
0
* Windglets
0
* Antidive
1
500 80 90 10 15
* Sprogs
1
1
490 120 0 10 15
* Elliptic tips
1
90 0.0 0.0
"elliptic.txt"
* Sail ends
LE 5 5
KE 5 130
TR 5
EL 5
* LE Deflections
2
330    0.0      0.0
580     20.0     0.0
* KE deflections
2
180 0.0
350 5.0
***********************************************************************
*  2. TRAILING EDGE SHAPE
***********************************************************************
3
"te-plan.txt"
3
"te-vault.txt"
***********************************************************************
*  3. AIRFOILS
***********************************************************************
8
2
1 "airfoil-01.txt" 1.0 0.0 0.0 0.0
2 "airfoil-02.txt" 1.0 0.0 0.0 0.0
3 "airfoil-03.txt" 1.0 0.0 0.0 0.0
4 "airfoil-03.txt" 1.0 0.0 0.0 0.0
5 "airfoil-03.txt" 1.0 0.0 0.0 0.0
6 "airfoil-04.txt" 1.0 0.0 0.0 0.0
7 "airfoil-05.txt" 1.0 0.0 0.0 0.0
8 "airfoil-06.txt" 1.0 0.0 0.0 0.0
***********************************************************************
*  4. BATTENS
***********************************************************************
6
1 1 5    0  0 100 3
2 1 100  0  0 100 3
3 1 200  0  0 100 3
4 1 250  0  0 100 3
5 1 350  7  0 100 3
6 1 480  15 0 100 3
***********************************************************************
*  5. DOUBLE SURFACE
***********************************************************************
2
60  20



SECTION HEADERS

***********************************************************************
* LABORATORI D'ENVOL HANG GLIDING DESIGN PROGRAM                      *
***********************************************************************


By lines, and regardless of the lines beginning with * which are comments or notes for help:

Line 1:  text  real
text:  Version
real: version number

Line 2:  text1  text2
text1:  Name
text2:  version name

Line 3:  text1  text2
text1:  Date
text2:  File date


SECTION 1 MAIN DATA

By lines, and regardless of the lines beginning with * which are comments or notes for help:

* Brand name
text: Define the brand name, write between ""

* Wing name
text: Define the wing name, write between ""

* Type
integer: wing type, where:

1= classic Rogallo
2= old floater
3= improved floater (Falcons)
4= Comet's clones
5=booms (Gryphoon, Zephīr...)
6=Topless
7=Fledges
8=Quick's

* Drawing scale
real: normally set to 1.0

* Wing scale
real: normally set to 1.0

* Nose angle
real: nose angle in degrees (60-180)

* Leading edge
real: leading edge length, use units in cm

* Keel
real: leading edge length, use units in cm

* Boom
real: leading edge length, use units in cm (or set to 0)

* Crossbar
integer: crossbar type, where:

0= no crossbar
1=straight crossbar (Rogallos and old floaters)
2=hinged crossbar

if crossbar type is not 0, then write:
line: real1 real2

real1:
crossbar junction position in cm along leading edge (not used in type 1)
real2:
crossbar central juntion postion in cm along keel

* Triangle
integer: control frame type, where:

1= old triangle using top part straight
2=classic triangle
3=cage system (Millenium)

next line: real1 real2 real3 real4 real5
real1: control bar length in cm
real2: upright bar length in cm
real3: straigth part bar length in cm
real4: triangle postion along keel in cm
real5: triangle-keel angle in degrees

If type 3, parameters still not defined

* Kingpost
integer: kingpost type, where:
0= no kingpost
1=classic antenna

next line: real1 real2 real3
real1: kingpost postion in cm
real2: kingpost height in cm
real3: kingpost angle in degrees

* Fin
integer: fin type, where:

0= no fin
1=vertical fin in rear keel
2=inverted fin in keel
3="V" fin

Parameters still not set for different from 0 type

* Windglets
0
* Antidive
1
500 80 90 10 15
* Sprogs
1
1
490 120 0 10 15
* Elliptic tips
1
90 0.0 0.0
"elliptic.txt"
* Sail ends
LE 5 5
KE 5 130
TR 5
EL 5
* LE Deflections
2
330    0.0      0.0
580     20.0     0.0
* KE deflections
2
180 0.0
350 5.0

(in redaction...)

The idea is first to create wire designs in 2D and 3D. Subsequently the tubes will be defined with their real sizes and compositions, including all holes.
The details of the unions will be generated with specific modules, with real sizes. The cables, also calculated taking into account the offsets corresponding to the joining elements, and additional lengths. and Finally the design of the candle, developing the 3D surfaces towards cutting patterns.

Thanks to this program, we hope that we will revive (at least in a parametric way, and maybe some in real way, many wonderful wings!!!).
For example, now thinking of all the necessary parameters to revive the Stratus 5B...!
Stratus 5B

Pere Casellas
pere at laboratoridenvol dot com
Teią, Barcelona, 8 July 2018

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