The company was tasked to operate into a strip adjoining a local race course. Details of the strip were obtained from a local pilot, who told a company pilot that there was a powerline at the eastern threshold of the strip. This pilot subsequently gave the strip data to the pilot who flew the aircraft. Upon arrival overhead the strip, the pilot saw powerlines off the western end and thought that these were the lines mentioned in the briefing. He then decided to land into the west. On late final approach, he saw the powerlines over the threshold and flew the aircraft under them. The resultant high rate of descent could not be arrested before ground impact and the aircraft struck the ground in a nose low attitude with the nosegear and propellers. The landing gear and propellers were torn off and the aircraft slid for 112 metres before coming to rest. The cabin was protected from high deceleration forces by the collapsing landing gear and the occupants escaped without injury. It was determined that the strip was not suitable in length or width for the operation of this aircraft type, and the briefing obtained on the strip was not adequate to determine the suitability of the strip.