RC12/10 12V Windlass. The RC12 fully automatic windlass series is designed to effortlessly retrieve and deploy 10mm (3/8") short link chain and 16mm (5/8") to 20mm (3/4") three strand or 8-Plait rope (RC12-10) and 12mm/13mm (1/2") short link chain and 20mm (3/4") three strand or 8-Plait rope (RC12-12).. With a maximum pull of 1590 kg (3500 lb), and an anchor retrieval rate of 15m/min (50ft/min), the RC12-12 is one of the fastest and gruntiest windlasses in its class.. A sleek, Low Profile versio