shown in fig1 a 1 b and 1 c the base cone is constructed by a strip 15 which may be formed of spring steel or the like that is wound as a tapered helix 13 as shown in fig1 b the lips 14 of the strips are formed such that they interlock as shown in fig1 c in the pre deployed configuration the tapered helix 13 is compressed to form a relatively thin u201c disc u201d 11 at the base 10 of the projectile 17 in the pre deployed configuration the tapered helix is held in its state via certain keeper or locking mechanisms numerous types of such locking mechanisms may be used such as a cable or bolt that may be released electrically or with explosive charges the locking mechanism may be designed to release the base cone due to the firing setback acceleration or set forward acceleration or by certain programmed action such as release or cutting of a holding cable or any other known methods in the art the base cone tapered helix 13 can be biased as a helical spring to deploy in the direction of the arrow 16 once it is released by the locking mechanism the base cone tapered.