A landyacht (alternatively slab, lead sled or yank tank) is an informal category of large sedans that American automobile manufacturers produced, particularly full-size, rear-wheel drive sedans, from the 1950s through the 1990s. Features commonly found in landyachts include very generous exterior proportions, somewhat vague steering, and a "spongy" ride with a feeling that is often described as being "floaty." Today, the term is applied to large, traditional American sedans, regardless of the actual characteristics featured in the vehicle, and to recreational vehicles.
The term is most commonly applied to the large American cars of the pre-oil crisis era. American automobile manufacturers placed much of their emphasis in the engineering of their vehicles on size and amenities during this time, as consumers were not concerned with fuel efficiency due to low gas prices, a lack of environmental awareness, and rising prosperity among the middle class. Cars of this era remain known for size, large and powerful V8 engines coupled with 3 or 4 speed automatic transmissions, excessive fuel consumption, and an emphasis on ride comfort at the expense of handling.
Design, as much as size, distinguished the landyacht sedans. While European and later Japanese car manufacturers often produced cars just as large and expensive, American marques distinguished themselves with eye-catching and innovative - though sometimes kitschy and absurd - design and marketing. Cars from Cadillac, Lincoln, Buick, and other American brands featured elaborate, often overdone, styling, in contrast to the more understated styling of German and British cars. In addition to simply being a large car, landyachts often included the following:
- Vinyl roofs (sometimes called carriage tops or Brougham tops)
- Opera windows
- Heavy chrome brightwork, especially on the fenders and grille
- Heavily cushioned, very roomy interior; usually upholstered in leather, vinyl, velour, or cloth
- Whitewall tires (especially in the 1950s and 1960s)
- Simulated wood paneling on station wagons.
After the oil crises of the 1970s and 1980s, American automakers never fully recovered from the decline in popularity of full-size sedans and coupes. Japanese automakers had successfully penetrated the market by catering to an American auto market that had become more interested in fuel economy and reliability than aesthetics and glamor. By the 1990s, American car-makers had learned to compete, producing smaller, more efficient - albeit visually uninspiring - mid-size cars like the Ford Taurus. GM's discontinuation of both of their B platform, which included the Buick Roadmaster and Chevrolet Caprice and its D platform (Cadillac Fleetwood) in 1996 marked the demise of that company's "true" landyachts, while Ford's full-size V8/rear-drive Panther platform, which underpinned the Ford Crown Victoria, Lincoln Town Car and Mercury Grand Marquis survived till the end of the 2011 model year (although the Crown Victoria was sold as a fleet model only from 2008-2011).
- Definition and list of full-size cars
- List of car manufacturers
- List of largest passenger vehicles in the United States
- Passenger vehicles in the United States
- Yank tank