To overcome the drawbacks of the prototype system, the authors have recently developed and implemented a field-rugged continuous intrusion miniature cone penetration test system.
Hydraulic power is provided by the vehicle's transmission.
The reversible hydraulic motor is capable of continuously inserting and retracting the single, continuous, coiled penetration rod. It has a 2 cm 2 cone penetrometer attached to one end and a connector at the other. The ability to coil and uncoil the thrust rod is one unique feature of this miniature cone system. Coiling eliminates threaded connections and simplifies water proofing. The coiling mechanism also straightens the rod prior to insertion into the soil.