Launched last year as vertical shaft liquid-cooled engines, Kohler Aegis developments now include a horizontal shaft configuration in three outputs of 17, 20 and 23 hp at 3600 rpm. Designed for commercial, construction and industrial applications, production of the 23 hp model is expected to begin in spring 2001."Our twin-cylinder customers can choose between air- and liquid-cooled models," said Cam Litt, product manager for Kohler Engines, Kohler, Wis. "It''s not a matter of one engine''s cooling system being better than the other; it all depends on the OEM''s needs and the application they are targeting."

In Colorado, HFH of Metro Denver also builds homes that incorporate passive-solar heating. Large, south-facing windows allow the low-angled winter sun to warm the interiors. Energy-efficient windows and well-insulated walls, floors and foundations retain the solar warmth, reducing demand for auxiliary heating. Because the houses are well-insulated and solar-heated, the furnaces can be downsized substantially. Energy-efficient models are standard. Programmable thermostats regulate backup heating and cooling systems, reducing demand when the house is unoccupied or residents are asleep. Insulation that keeps the houses warm in the winter also helps to maintain a cool interior in Denver''s dry, hot summers. Plus, 2-foot-wide overhangs block the high-angled summer sun and provide shade for walls and windows.

Jim/Stafford: Early design involvement on the part of the manufacturer is the best way to make sure the resulting component will be reliable and effective.Jeff/Tollok: Carefully review your application requirements. Shaft material, hub material, transmittable torques, and bending moments can influence your selection of the proper locking assembly.Intelligent designWhat can DESIGNERS do when selecting and applying locking devices to improve productivity?Jeff/KTR: Obtaining comprehensive technical information will improve selection and performance. Find a manufacturer that maintains the quality of materials, dimensions, and surface finishes.Jeff/Tollok: Too often not enough questions are asked, and selections are made based on previous designs. Don''t use the same locking assembly simply because it was used elsewhere on the same machine or on a previous machine design. Involve your supplier and use their experience to get recommendations.

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