H1 Unlimited is a professional racing series that features high-speed hydroplanes, also known as unlimited hydroplanes. These boats are designed to race on water, reaching speeds of over 200 miles per hour. The series showcases thrilling competitions on various waterways, attracting fans and participants from around the world. The races typically take place during the summer months and include multiple events across different locations. Each race involves teams that meticulously prepare their boats, ensuring they are equipped for the challenging conditions. H1 Unlimited has a rich history, with roots dating back to the early 20th century, making it a significant part of motorsport culture.