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Off-the-shelf CFD software is available from firms such as AEA Technology Engineering Software, a Waterloo, Ont., firm that recently introduced an updated version of its CFX-TASCflow, which features a greatly enhanced cavitation model. Cavitation is the primary cause of pump failure, Jones points out. CFD software was more geared to hydraulic flows in pumps and inducers in turbomachinery when Alfa Laval battery embraced the technology. The payoff has been centrifugal pumps that create less sheer and can handle some pumping jobs previously reserved for positive displacement pumps.

Two walking-only layouts -- the Straits and Irish courses, both designed by Pete Dye -- welcome groups at Whistling Straits, powered a part of The American Club resort in Kohler, Wis. The caddie pool here is about 300, and the cost of the service is built into the greens fees; tips are extra. Full shotgun tournaments with 144 players can avail themselves of the caddies'' muscle and course knowledge."There is a different breed of golfer out there," said Kent Instefjord, Whistling Straits'' head golf pro. "Walking is becoming a part of the game, like it used to be. There has been a resurgence around the country. The caddies really help the player navigate the the golf course."

What size tractor do I need for my number of acres?That depends on what you want to do with the tractor and what your land is like. If you just want to mow grass on a fairly small, flat, level yard, a riding mower will probably be all you will need. On the other hand, if you want to plow a field, bale hay, pull stumps or exchange implements with neighbors, you''ll need a more powerful machine.Take a look at the "Tractor Selection Chart" on the right. Under "Characteristics," note the differences among the four tractor categories and decide which category best fits your work environment. Under "Uses," determine which tasks you will want to do with your tractor and note which tractor categories are capable of performing those tasks.