Incredible Ice Castles Grown by a Minnesota Man Using Geothermal Heating System
He explains the process:
The frame for the ice to collect onto is made from ½" conduit. There are four tiers each 10 feet high. These tiers are hoisted (in sections) from a rope that stretches from two towers 85 feet apart and 50 feet high. The final center conduit pole is pushed up onto the rope to a height of 63.25 feet.
The robot that directs the spray is made from two antenna rotators. One rotator is attached to the other to allow azimuth and elevation motion. These antenna rotators are controlled by a computer using software that I have created. The computer program also uses weather info from a weather station on the top of the house. The weather information such as the wind direction and speed is used to more accurately target the spray.