On October 2, 2000, at 1355 eastern daylight time, an Alvin R. Kemmet Tango 2 experimental homebuilt airplane, N29AK, registered to and operated by the pilot, was substantially damaged when it landed hard and nosed over at Hidden Lake Airport, New Port Richey, Florida. The pilot received serious injuries, and the pilot rated passenger aboard received minor injuries. Visual meteorological conditions prevailed, and no flight plan was filed for the personal flight being conducted under Title 14 CFR Part 91. The flight had originated from Cross City Airport, Cross City, Florida at 1300. The uncertified pilot reported that the airplane landed hard and proceeded to bounce twice on the runway before the nose gear collapsed. The airplane skidded to the right off of the runway and hit a runway light with the right main landing gear. The airplane then flipped upside down. Examination of the airplane disclosed that , propeller strike marks were found on the runway at the point of gear collapse, and no mechanical faults or failures were found. In addition, the pilot reported that there were no mechanical malfunctions with the airplane. The pilot did not possess a valid medical certificate or pilot's certificate at the time of the accident.