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Blade element theory (BET) is a mathematical process originally designed by William Froude (1878), [1] David W. Taylor (1893) and Stefan Drzewiecki (1885) to determine the behavior of propellers. It involves breaking a blade down into several small parts then determining the forces on each of these small blade elements.
The Lonsdale belt is a coveted prize with great monetary and sentimental value, finding homes in private collections and museums, and has been auctioned for large sums of money. Belts have been stolen on numerous occasions, none of which have ever been found. Since 1909, only 161 boxers have won a Lonsdale belt outright across all weights.
This land produces sapan wood (useful to produce red dye), diamonds, sandalwood, incense, puyang pepper, cantharides (green beetles used for medicine), steel, turtles, tortoiseshell, strange and rare birds; such as a large parrot as big as a hen, red and green parrots, five-colored parrots, (all of them can imitate the human voice), also guinea ...