Fastest motorised hot tub
Duncan Foster, Phil Weicker
84.14 kilometre(s) per hour
United States ()

Taking the term "carpool" to a new meaning, two Canadian car enthusiasts, Phillip Weicker and Duncan Forster, enlisted a Los Angeles, California, USA-based crew to convert a 1969 Cadillac DeVille into a hot tub on wheels, which they named Carpool DeVille. The 472-cubic-inch V-8 convertible had its chassis strengthened and the interior of the car was replaced with a single-piece fibreglass tank especially moulded to fit in the classic car. The steering column was made watertight, and a liquid-to-liquid heat exchanger with engine coolant ensured that the Jacuzzi water could be heated to 102°F (38.88°C) in about 35 minutes. On 10 August 2014, at tests on the land adjacent to the Bonneville Salt Flats in Wendover, Utah, USA, Weicker and Forsters drove Carpool DeVille to an average speed of 52.28 mph (84.14 km/h) in their two best runs, reaching a maximum speed of 54.8 mph (88.19 km/h) in the third and best run.

The speed was measured by three mobile GPS devices and verified by stopwatch timing over a measured 0.3-mile (482.80-m) level course.

Fitted with 11 water jets, a spa filter and an overflow tank, the tank can sit five and carry up to 375 US gal (312.25 UK gal; 1,419.53 litres) of water, bringing the weight of the 4,600-lb (2,086.52-kg) car to 9,000 lb (4,082.33 kg) when full.

The car was bought for $800 from eBay in 2008. Its conversion took six years to complete, with some of the funds crowd-sourced through Kickstarter.