All teams compete in nearly identical Dallara SF23 models, but use engines supplied from Honda and Toyota, preventing it from being a true spec series.[citation needed] Having a rigid one-design specification keeps design experimentation to a minimum and reduces cost of ownership.The popularity of one-design increased in the 1970s with the introduction of laminate construction using fibre-reinforced plastic (FRP) and mold building technology.[citation needed] The one-design design idea was created by Thomas Middleton of the Shankill Corinthian Club located 10 miles (16 km) south of Dublin, Ireland in 1887.It quickly became popular, and was patronised by some of the most energetic and best known yacht owners in the Solent, Portsmouth and Southampton waters including Sir Philip Hunloke, the King's yachtmaster.[22] In medium- to large-sized boat classes, One design would refer to conformance to a standard specification, with the possibility of alterations being allowed as long as they remained within certain tolerances.[citation needed] In other classes, the one-design class may have organized around an existing fleet of similar boats that traditionally existed together often for commercial purposes[citation needed] such as sailing canoes, dhows, and skipjacks, or boats that developed a common hull form over the years (such as A-Scows).[23] In contrast to 'one-design', other sailboats race under a variety of handicapping rules and formulas developed to allow different type boats to compete against one another.Handicap rules include Portsmouth Yardstick, PHRF, IOR, IMS, IRC, Americap[24] and LYS."[26]Other one-design gliders have included those made in Russia by Aviastroitel, in Poland by Warsztaty Szybowcowe Orlik, and Germany, where for example the DFS Olympia Meise was planned for the 1940 Olympic championships.