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Electric boats for racing are capable of reaching speeds of more than 50 mph and run times of around 10 minutes. Electric boats also hold the 100-yard sprint record against rival internal combustion powerplants since 2000. Tethered racing and free-running craft were popular prior to the advent of cheap radio control.
A pump-jet works by having an intake (usually at the bottom of the hull) that allows water to pass underneath the vessel into the engines. Water enters the pump through this inlet. The pump can be of a centrifugal design for high speeds, or an axial flow pump for low to medium speeds. The water pressure inside the inlet is increased by the pump ...
A tunnel hull is a type of boat hull that uses two typically planing hulls with a solid centre that traps air. This entrapment then creates aerodynamic lift in addition to the planing (hydrodynamic) lift from the hulls. Many times this is attributed to ground effect. Theoretical research and full-scale testing of tunnel hulls has demonstrated ...
Overall, the boats weigh 860 pounds (390 kilogrammes), including 260 pounds (118 kilograms) of engine. They are 20 feet (6 metres) long and seven feet (2 metres) wide, keeping weight low through extensive use of carbon fiber and kevlar. The tunnel hull design creates aerodynamic lift due to a 'wing' formed by the deck and under surface of the ...
A water tunnel is an experimental facility used for testing the hydrodynamic behavior of submerged bodies in flowing water. It functions similar to a recirculating wind tunnel , but uses water as the working fluid, and related phenomena are investigated, such as measuring the forces on scale models of submarines or lift and drag on hydrofoils .
The Garfield Thomas Water Tunnel is the facility's largest water tunnel. [7] The 100 feet long, [ 5 ] 32 feet high, [ 5 ] 100,000 [ 1 ] gallons tunnel is a closed-circuit, closed-jet. The system is powered by 1,491 kW (2,000-hp) pump, with a 4-blade adjustable pitch impeller and can produce a maximum water velocity of 18.29 m/s (40.91 mph).
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The lake stores water from Big Creek and the South Fork San Joaquin River for release through a tunnel, plunging 2,131 feet (650 m) to Big Creek Powerhouse No. 1 on a small forebay called Dam 4. From here the water is diverted through another tunnel, dropping 1,858 feet (566 m) to Big Creek Powerhouse No. 2 on Dam 5.