Diagonal ribs

The Diagonal ribs is maybe the one with the most complex parameter set.

There are 6 different types of Diagonal ribs, each of the types with it’s own set of parameters.

IMPORTANT

single digit types (x: 1…6) do use absolut measurings in [cm] which will be scaled with the scaling factor of the wing

double digit types (xx: 11…16) are set in [% of the profile chord]

IMPORTANT

DO NOT merge single or double digit types withing the same configuration. Use just either one!

Raw data:

***************************************************
*       12. H V and VH ribs
***************************************************
12
80  150
1   1  0  1  1  1  6.0  0  0  0
2   1  0  2  1  2  6.0  0  0  0
3   1  0  3  1  3  6.0  0  0  0
4   1  0  4  1  4  6.0  0  0  0
5   1  4  1  5  1  6.0  0  0  0
6   1  4  2  5  2  6.0  0  0  0
7   1  4  3  5  3  6.0  0  0  0
8   1  4  4  5  4  6.0  0  0  0
9   1  8  1  9  1  6.0  0  0  0
10  1  8  2  9  2  6.0  0  0  0
11  1  8  3  9  3  6.0  0  0  0
12  6  8  4  9  4  6.0  0  0  0  11  12

x and y Spacing

X and y Spacing” is the horizontal/ vertical separation distance between V-ribs drawn in box 2-4. The distance in cm will be multiplied by the scale of the drawing. So if “x-spacing” = 80.0 cm and “drawing scale” = 1.5 total distance is 80.0 x 1.5

Number of configs

Diagonal ribs is an optional section.

If you do not want to define/ use these parameters set the Number of configs value to 0.

Type 1/ 11: Horizontal strap between rib i1 and rib i2

Type	Ini Rib	Param A	Param B	Param C	Param D	Param E	Param F	Param G	Param H	Param I
1/ 11	from rib	row [1]	to rib	row [1]	width [2]	0	0	0	0	0

[1] (1,2,3,4,5,6)

here anchor rows are used again: row 1=A, row 2=B, ….

[2]

type x: strap witdh in [cm]

type xx: strap witdh in [% chord]

Type 2/ 12: Diagonal partial V-rib centered in rib i

Type	Ini Rib	Param A	Param B	Param C	Param D	Param E	Param F	Param G	Param H	Param I
2/ 12	rib	row [1]	left [3]	right [4]	r- [5]	r+ [6]	height [7]	beta [8]	0	0

[3] (1,2,3,4)

left

“0”: no left diagonal rib will be created

“1”: a digonal rib to the left will be created

[4] (1,2,3,4)

right

“0”: no right diagonal rib will be created

“1”: a digonal rib to the right will be created

[5] (1,2,3)

lower rib width

type 1: in [cm]

type 2: in [% chord]

[6] (1,2,3)

upper rib width

type x: in [cm]

type xx: in [% chord]

[7] (1,2)

type x: in [cm]

type xx: in [% chord]

[8] (1,2)

beta

angle of the upper end

Type 3/ 13: Diagonal full V-rib centered in rib i

Type	Ini Rib	Param A	Param B	Param C	Param D	Param E	Param F	Param G	Param H	Param I
3/13	rib	row [1]	left [3]	right [4]	r- [5]	r+ [6]	0	0	0	0

Type 4/ 14: “VH-rib” between rib i-1 to i+2

Type	Ini Rib	Param A	Param B	Param C	Param D	Param E	Param F	Param G	Param H	Param I
4/ 14	rib	row [1]	left [3]	right [4]	r- [5]	r+ [6]	height [7]	beta [8]	0	0

Type 5/ 15: full continous VH-rib centered in rib i

Full continous V-ribs type 5 using parabolic holes (if height < 100%)

Full continous V-ribs type 5 using elliptical holes (if heigth > 100%)

Type	Ini Rib	Param A	Param B	Param C	Param D	Param E	Param F	Param G	Param H	Param I
5/ 15	rib	row [1]	left [3]	right [4]	alpha1 (LE)	alpha2 (TE)	height [9]	r [10]	0	0

[9]

height < 100[%]: parabolic hole

height > 100[%]: elliptical hole

[10]

type x: in [cm]

type xx: in [% chord]

IMPORTANT

When using type 5/ 15 ribs keep in mind the following:

• The number of anchorages on the rib “i” must be equal to the number of anchors on the right and left, even if they are not used (they can be virtual, ie without lines)

• To define the Type 5 rib, use a number of lines equal to the number of anchors.

Example for 4 anchor points:

5       5 1     1 1    60.0    60.0    80.     7.
5       5 2     1 1    60.0    60.0    80.     7.
5       5 3     1 1    60.0    60.0    80.     7.
5       5 4     1 1    60.0    60.0    80.     7.

Type 6/ 16: general diagonal “VH-rib” between rib i and rib i+1

Type 6/ 16 is a general diagonal. It’s very simple. A trapezoidal diagonal ranging from rib number i to rib number i+1. But the rib is totally configurable in size and position. It has been designed to develop competition paragliders CCC types, which need to jump between 4 and 5 cells without lines. But it can also serve to design simplest paragliders, and replacing some of the types of diagonals described above. It is also very useful to define transverse horizontal strips located in all parts of the wing (the tapes have not necessarily coincide with the anchor points).

Type	Ini Rib	Param A	Param B	Param C	Param D	Param E	Param F	Param G	Param H	Param I
6/ 16	rib i	pos [11]	height [12]	r+ [13]	r- [14]	rib i+1	pos [11]	height [12]	r+ [13]	r- [14]

[11] (1,2)

type x: in [cm]

type xx: in [% chord]

[12] (1,2)

[% chord]

[13] (1,2)

type x: in [cm]

type xx: in [% chord]

[14] (1,2)

type x: in [cm]

type xx: in [% chord]

Sort by Order Num

The button Sort by Order Num can be used to rearrange the definition lines. If for whatever reasons you will rearrange the lines, just define the numbering in an ascending order and press the Order button afterwards. Lepg will reorder the lines according to the numbering you’ve choosen.

A more detailed description you can find here Laboratori d'envol website.