Among the best-known and most successful of His Majesty's water provision projects has been the Royal Rainmaking programme. He began to study how clouds might be seeded to produce rain. In 1969 he carried out preliminary tests at Khao Yai National Park using a Cessna 180 and dry ice. In August 1969, he moved to Hua Hin and used two aircraft in a variety of weather conditions to determine what worked best. Initially, he financed the research with his own funds but in 1970, he sought temporary funding for a "Rainmaking Project" from the government. With it, he established the Royal Rainmaking Research and Development Institute. Based on it, he has spent succeeding years refining his techniques to accord with varying cloud conditions and to suit differing climatological and geographic areas, enjoying considerable success throughout Thailand.