The new Navigator features Vermeer dual rod technology that uses an inner rod to provide torque to the drill bit, while the outer rod offers steering capability and rotation torque for reaming. The combination provides powerful downhole cutting action and the flexibility to select the appropriate tooling to best match the ground conditions.

"Dual rod drilling rigs are much easier to use than other rock drilling solutions and provide more versatility when a contractor is drilling soil conditions that vary significantly throughout the bore path," said Tod Michael, product manager of trenchless products at Vermeer. "With the D40x55DR S3 horizontal directional drill, we've incorporated the dependability and performance of our popular D40x55 S3 Navigator horizontal directional drill with the latest advancements in dual rod technology to create a familiar operator experience that will outperform many other rock drilling solutions."

Using a new dual drill rod design, the time and steps required to add or remove a rod on the D40x55DR S3 is cut by 30 per cent compared to previous Vermeer models.

A hollow inner rod design results in more air and drilling fluid flow to the drill head on pilot bores and the hole opener during pullback. The minimal restriction means contractors have more tooling options ranging from rotary, drag cutting and roller cone bits to an air hammer, as well as the ability to pull larger hole openers.

The newest tooling option for Vermeer dual rod directional drills is the RH15 rock drill head. Developed in conjunction with the D40x55DR S3, the RH15 drill head can handle 1,500ft-lb (2,033.7 Nm) of inner rod torque for pilot production. It is designed to give operators excellent steering control and sonde security using a proven roll pin lid.