Boat size recommendations are for boats of average windage and proportions in 30 knots of wind, average bottom conditions, and moderate protection from open seas. Remember that the loads in 42 knots of wind are twice as much as in 30 knots. Use three-strand nylon rope, 6-12 ft (2-4 m) of chain and a minimum of 5:1 scope. Also, a minimum of 6 ft (2 m) of chain should be used for every 25 ft (8 m) of water depth. For storm conditions use an anchor one or two sizes larger.
Fortress anchors are engineered for performance.
Fortress anchors are precision-machined from a high-tensile, corrosion-resistant, aluminum magnesium alloy, and are sharper and able to penetrate faster and deeper into most common sea bottoms than heavier, dull-edged traditional steel anchors which weigh 50% more or even greater. In the US Navy tests, not only did the Fortress anchors out-perform much heavier steel anchors, they were also able to withstand pull loads that averaged over 200x their own weight ... and without incurring serious damage to the anchors, which was noted in the test report summary: "The fact that the Fortress anchors incurred no significant structural damage at such high holding ratios suggests that the anchors have been extensively engineered from both the hydrodynamic and structural standpoints."
Additional features include:
Fortress anchors can be quickly disassembled for compact storage as a spare or storm anchor. Fortress anchors let you choose between two shank / fluke angles to provide outstanding holding power in common sea bottoms – a 32° angle for sand, mud or clay, or a 45° angle for soft mud. Fortress anchors offer a Lifetime Parts Replacement Warranty. In the unlikely event of damaging an anchor part, Fortress will replace the damaged part for free. The only cost to the customer is for shipping & handling, which is nominal.
