DOPERO

Ralf Beutnagel realized 1994 the DOPERO (Douple Pearson Roller) by side-by-side arrangement of two Pearson roller.
The DOPERO is a kite with strong pull and very good for KAP

all meassures in cm
kiteplan translations:
Waage=bridle
Bogenspannung=bow-string

materials:
4 x 150cm CFK 8mm (10mm GFK) ø
3 x 150cm CFK 10mm (12mm GFK) ø
1 x 100cm CFK 2mm ( 3mm GFK)
about 5m fabrics
dacron for the sleeve of the lower sail and for reinforcement
band for the middle stretches between the two sails
line and tensions adjusters

sail:
The lower cross-spar is fit into a dacron sleeve.
Along the cross-spars and the spines the sail is reinforced with dacron ( 2 cm wide)
There is a spine across the two keels.

spars:
spines 10 mm CFK. (150 cm + 50 cm)
cross-spars 8 mm CFK (2x150 cm)
for the keels use 2 mm CFK

At the cross-points the sail is adjusted with bands.
The kite is stretched about 32-36 cm. (with tension adjusters)
In the centre both sails are bound together with band. At the outher end they are tied with adjustable lines

bridle:
the kite needs a four point bridle(w1, w2, w3, w4).
length of the bridle-lines:
w1 + w2 : 450 cm
w3 + w4 : 322 cm + 122 cm

use a 180 daN (300 lb) flight line