This video shows a series of photographs of a caterpillar tunnel under construction at Johnny's Selected Seeds Research Farm in Albion, Maine. The Quick Hoops™ High Tunnel Bender is used to bend fence rail to create 12-foot diameter hoops which are then used to build a 12-foot-wide x 7-foot-high tunnel of any length. Materials include 1-3/8" fence rails, 1-5/8" fence posts, cross-connectors, 6-mil greenhouse film, and parachute cord. The Quick Hoops™ Moveable Caterpillar Tunnel Bender can be used to create a similar, but moveable version of the caterpillar tunnel.
Photos were taken some years back. Be sure to refer to our construction manuals for complete, up-to-date, accurate instruction.