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Drogue Description
The "holey sock" drogue is made of 600 Denier Cordura Nylon cloth, the diameter of the tube is 24 ins. (61 Cm.) and the length is five times the diameter 120ins. (305 Cm,). The drogue is divided into 5 different sections; the center of each contains a ring stiffener of "polypropylene" to provide circular stiffness to the drogue center. Each section of the drogue also has two 12in. (30Cm) hole cut into it 180deg. apart. These holes are rotated 90 deg to the next adjoining section holes.

The tether is made of "Space-lay" wire rope 5/32 in. (4mm.) O.D. with a tensile strength o 1700 lbs. (771 KGs,). The upper end is attached to the surface float as above. It is cut so the center of the drogue, when suspended from the surface float, is approximately 49ft. (15m.) below the surface.

The drogue upper ring is mode of 1" (25.4mm) SCH 80 PVC to which the drogue is also attached. The cloth attachment area has four diametrically opposite areas left open to enable the attachment of the "spider" wires. This "spider" is the lower attachment point for the tether and is so designed to provide resilience to the forces applied by the tether/float forces. Four Space-lay wire ropes 1/8 in. (3.2mm) OD is tensioned orthogonally across the upper PVC ring. These wires pass through a 2" (12.9Cm) SCH 40 PVC cap. The tether is attached at their junction and the joint is poured with epoxy to minimize relative motion and reduce corrosion. A carrot of the same dimensions as the one described above is also poured over the joint/tether assembly. In addition to protect the spider wires from chafe a 2in (5Cm) long of 1/4in. (6,3mm) air hose is used protect the spider wires where they pass through the PVC cap.

Drogue Description
a)     Holey sock made from Cordura nylon cloth; diameter 100 cms length 670 cms. construction consists of 4 cylinrical sections, each 122 cms   long. Two 30 cm dia. holes cut opposite each other in each section. Axis   joining holes is rotated by 90° between successive sections.  Drogue is   centered at 15 m.
b)    5.5 kg lead weight sewn into base of sock inside a 2.5 cm O.D.   schedule 40' PVC-pipe ring.
c)     2.0 cm ID, 0.16 cm wall, polypropylene "irrigation" pipe ring   between each 122 cm segment for support. Rings are drilled to allow flooding.
d)     2.5 cm O.D. "schedule 80" PVC-pipe top ring.

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