le

gnupwing    ( gnu-para-wing )

The gnupwing is a improved and large scale NASA parawing of 3 lobules. Current experimentation show some problems whit stability and small surface. A 45m2 model will be better. I plan essay soon a more simple model and large scale model like Irvine "Delta II" or Vonblon "Papillon"...

Note 12 january 2005: The design can be improved in performance making some changes in the nose section (soon).

 Description fulfilled of the wing, for their free study, copy and development.

Basic datum:
gnupwing (parawing)
surface
 30.17 m2
span
 9.56 m
wing wheight
 3 kg
glide ratio
 2.5+
fabric
 Nylon ristop 44gr/m2
lines
 kevlar 2mm

# 1. General considerations
# 2. Map plant of the sail with its anchorages
# 3. Tables of basic geometry and length of lines
# 4. Coments
# 5. Materials

1. General considerations.

The gnupwing is a hybrid wing among parachutes and paraglide, designed by the flight of planeig. He is not a paraglide, then does not have drawers, and is from simple surface (being a type of "paraglide of simple surface"). He is based directly in the "Parawing" design, developed by the engineer of the NASA Francis Rogallo, considerate one of the precursors of the delta wing and also of the paraglide, towards mid the sixties. And it follows the same philosophy of flight of the "Sailwing" of David Barish, although the Sailwing was quite a lot more evolved that the Parawing-gnupwing. 

2. Map plant of the sail with its anchorages

gnupwing  
 

3. Tables of basic geometry and length of lines.

Basic geometry of the wing:
Keel triangle 625 cm
Surface
 30,178 m2
0,8Keel 500 cm
1,53Keel 956 cm
step_keel 41,667 cm
step_b.a. 83,333 cm

Points of anchorage and length of suspension lines:
(Some lengths still in study)
Point
Distance to the anchorage
Line lenght
N3
 0
 582,1
A1
41,67
 -
A2
83,33
610,0
A3
125,0
610,7
A4
166,7
613,3
A5
208,3
613,3
A6
250,0
613,3
A7
291,7
613,3
A8
333,3
607,1
A9
375,0
600,0
A10
416,3
589,3
A11
458,3
575,0
A12
500,0
557,1
 
 
 
B1
83,33
582,1
B2
166,7
569,6
B3
250,0
550,0
B4
333,3
525,0
B5
416,7
478,6
B6
500,0
432,1

4. Coments

The plantform of the wing appears from a right-angled triangle in what some pikes have cut for him. The lenght of the keel of reference that provides 30 m2 of area, is from 625 cm and corresponds to the bisector of the rectangle angle of the fulfilled triangle. Really, the keel (A1-A12) real of the wing is of 500 cm, the same as the near attack A1-B6. The span in plant (B6-B6) is from 956 cm, although in flight aprox is reduced to a 60%. The separation of anchorage points for the near attack and the keel is homogeneous. The zone of the nose is the most complex. It is necessary to bend the fabric and to connect through some loops of cordino of 16 cm, the points N0-n0...,N3-n3 (n3=A1). All the zone of the nose has to be experimented on the model real then it is fundamental for the behavior of the wing. The suspension lines A1,A2,A3 have to finish fitting experimentally; A1 at present not the suspensions and I anchor in the point N3 a line of 582,6 cm. It seems strange to have 250 cm of nose without suspension...(then can be convenient suspentar N1 or n1).

The lines of brakes and a control of the wing they can be a simple V anchored in B6 and A12. Pulling in to the  brake, the wing wins stability and the nose less trend to fold. It is necessary to study experimentally one stopped more precise.

The gnupwing will be equipped with two conventional bands for side. The bands of behind can pick up B6-B5-B4-A12-A11-A10-A9-A8 and the front part the rest. The bands fix with musketoons with surely in one it ate conventional of paraglide.

5. Materials

For the suspension lines need some 235 m of kevlar lines of 1,5 or 2 mm. For the sail some 38 m2 of waterproof and resistant light fabric, ideally of nylon or polyester in ristop of sufficient grammage 44 g/m2. For the anchorages I propose the one that we will make loops of anchorage about itself, and we will sew along the keels and leading edges to use flat ribbon of poliéster of 24 mm of width. All reinforcements that are necessary can be made. To sew every to use thread of polyester of the best quality. For the bands to use flat ribbon of 2 or 3 cm of width of the best quality and making the fixation of all loops perfectly. We will use also four maillon rapide of stainless steel of 5 mm or face.

Some details of manufacture.

vora d'atac
Anchorages and reinforcements near leading edge

ancoratges centrals
Anchorages and reinforcements to central keels

ancoratge cinta-suspente
Anchorage type line-ribbon


Pictures of the first essays of the gnupwing:
Photos: Xavier Moreno Tests: Pere H. Casellas

Teia-1

Photo 1: Control of the wing stabilized above, prepared to giving ourselves the turn,
running, and... the same as a paraglide. It is necessary to correct the incidence
general of the wing.

Teia-2  
Photo 2: Pre-inflated of the wing. Even with little wind it rises well, since it weighs very little.

Teia-3  
Photo 3: Another prospect of the wing and its facility to inflate.


The prototype núm.1 has been extensively a tested, concluding the
following faults:


As solutions it is proposed:

- Increasing the area for 45-50 m2! and improving the line design
- Designing a model of 5 lobules type "sailwing"

Links:

http://www.vonblon.com Vonblon rescue parachutes
http://pingvin.letim.org/PAPILLON.htm

Wings to construct...

Delta II - Rogallo
Barish Sailwing replica

                                                                                         return


-------------------------------------------------
Web atractors and google suggestions:

Paracommander 1 1
Delta II para wing
Rogolo wing Pioneer
Parawing
Barish Sailwing
Para-foil
Volplane
Paraplane
Paradactyl
Thunderbow
Kone
Kohnke