Ibercisa delivers two towing winches AHT type model MR-E/930/2/2500-89. The electrically driven winch is one of the first of its kind in the world to be given this drive which has meant quite a challenging technological feat for the Vigo based Company given the dimensions and characteristics of the machine. The "Bylgia" and "Kolga" were designed around the dimensions of the winch, developed by Ibercisa to reach a final weight of 280 tons. Given its size, the drums (90 tns each) have had to be installed on the boat whilst afloat. The winch has two waterfall drums each with a capacity of 2,500m of 86,9mm wire. Giving 350 tons per 10 metres/minute on the first layer with the same pull, speed increases to 50 metres/minute when offload is against the dynamic brake. The static brake capacity is 600 tons on each drum, divided between two differential band brakes. Each engine works with a gearbox joined together by a declutching transmission allowing drums to work simultaneously, reducing pull by half and giving greater versatility. Wire stowage is carried out by 4 rollers working independently and therefore permitting their movement to be in time with the cable guide, or moving in opposite directions to allow shackles and joints to pass freely. Each roller is driven by chainsgeared on wildcats by two electric motors with epicicloidal gears.