Racing Inboards - Formula R1000
There are some categories to consider when racing this type of boat. The hull must be of a hydro type (the sponson should not exceed 60% of the total length of the hull). The most forward end of the sponson must be deformable and must be designed to crush (pickle-forks, rule 509.02 UIM). The minimum weight of the boat without a driver is 200 kg about 400 lb. With a driver it is 280 kg, about 560 lb. The fuel must be correspond to rule 508 UIM. Materials used to build the boat: The Hull of the boat is made out of wood, and the hoods of the boat are made out of fiberglass.
In the world of speed boat racing, this class has become a very strong influence in Eastern Europe and in Central England. In the last years, there were 10 to 12 racers from Germany to venture the waters of the F R1000 class. In Order to keep this class of racing from dying out, it has been put into what was called since the early nineties the Historical Class HR-1000. This eliminates the expensive upgrades in engines and boat design, for instance special safety cockpits. From 2002 this class is called Formula R1000. Only naturally aspirated reciprocating carburetted boat, motorcycle or motor car engines older than 10 years, are permitted. The drive line between engine and propeller to be basically straight (no Z drives). A gearbox may be attached at the motor however it is forbidden to change the gears while racing (rule 518.01 UIM). Favorite engines are Yamaha, Honda and Rotax. The 2-stroke Tact Wartburg engine is not longer in use. The engines can go up to 110 to 140 horsepower and reach speeds up to 150 kmph (90 mph). Reinhard Gerbert reached 157 kmph in Lorch at 24th June 2001 - measured with GPS.
Here are the official World Speed Records in category Formula R1000: