High-capacity mast on a drilling rig

A method of building a slingshot style land-based drilling rig, comprising:

• providing a platform collapsed on a substructure over a proposed well drilling location;
• assembling a high-capacity mast with a first racking board and a second racking board in a horizontal condition by:
• attaching a mast bottom section of the high-capacity mast to the platform;
• while suspending a mast lower intermediate section of the high-capacity mast horizontally with a sling, attaching the mast lower intermediate section of the high-capacity mast to the mast bottom section of the high-capacity mast;
• attaching the second racking board to the lower intermediate section;
• after attaching the second racking board to the lower intermediate section, attaching a mast upper intermediate section to the mast lower intermediate section;
• attaching the first racking board to the mast upper intermediate section;
• attaching a mast top section to the mast upper intermediate section;
• the assembled high-capacity mast in the horizontal condition having an opening formed therein sized to accommodate four Range 2 pipes or three Range 3 pipes connected together, the first racking board sized to accommodate four Range 2 pipes or three Range 3 pipes connected together, and the second racking board sized to accommodate stands of casing;
• raising the high-capacity mast from the horizontal condition to a vertical condition by pushing a side of the high-capacity mast to pivot the high-capacity mast about a pivot point on the platform such that the second racking board is disposed between the first racking board and the platform;
• and
• raising the platform from a collapsed condition to a raised condition over the substructure and securing the platform in the raised condition.