Tonka (fuel) necessary for the mixture to work as desired, rather than fail catastrophically, is a function both of the ingredients' purity, and of their temperature during use. Tonka (fuel) Tonka (also TONKA-250 and R-Stoff) is the name given to a German-designed rocket propellant first used in the Wasserfall missile; it has also more recently been used by North Korea but found its greatest applications (under the name TG-02) in the Soviet Union, for example, in the propulsion projects of the A.M. Isayev Chemical Engineering Design Bureau. Its name is a reference to the tonka bean; as it was invented during the
Vanilla production in French Polynesia production (FAO records for 2013) in French Polynesia (specifically Tahiti) accounted to only about 0.07% of the total world production; it was 60 tons from an area of with an yield of 13 hectograms per ha, comparative to the 3,500 tons yielded by plantations in Madagascar, and 3,400 tons yielded in Indonesia. Some plantations are open to tourists; Maison de la Vanille for instance, near Haamene, permits visitors to view the vanilla preparation and drying processes. The island of Tahaa offers a tour, conducted by a private outfit, that takes visitors to one of the older and more voluminous plantations,