Collapsible drift sock

In a sea anchor drag means including a cylindrical tubular body with a central axis, and with an inlet opening formed at the proximal end thereof and an outlet opening formed at the distal end thereof and in opposed relationship to said inlet opening, mooring means including lines for deploying said cylindrical tubular body and for the secure coupling of said cylindrical tubular body to a vessel, flow control means for controllably and adjustably constricting the size of said outlet opening to adjust the drag force of said sea anchor drag means;

• the sea anchor drag means being further characterized in that:
• (a) said cylindrical tubular body comprises an elongated cylindrical member with a central axis, and with a constant diameter from said inlet opening to said outlet opening, and having a plurality of line-receiving grommets positioned at equally arcuately spaced positions along said outlet opening;
• (b) said mooring means comprises at least three webs having elongated portions thereof secured to the outer periphery and along axes parallel to the central axis of said cylindrical tubular body, with said webs being disposed at generally equally arcuately spaced positions along said cylindrical tubular body;
• (c) said flow control means comprising at least one line segment extending from a point spaced outwardly from said proximal end to said distal end, and passing through said line-receiving grommets to permit adjustable closure of said outlet end, the arrangement being such that the partial closure of said outlet end reduces the area of said outlet opening to constrict the flow of water through said cylindrical tubular body while the expansion of said outlet end enlarges the area of said outlet opening to permit unimpeded flow of water through said cylindrical tubular body;
• and
• (d) said flow control means comprising at least a pair of said line segments, wherein each of said line segments have a mid-section and which are secured together, and wherein separate said line-receiving grommets are provided for each said line segment and with said grommets being arranged in pairs and with the members of each pair being disposed in oppositely disposed relationship, one to the other across Said cylindrical tubular body to facilitate symmetrical closing of said outlet opening.