Windmills and Wind Motors: How to Build and Run Them by F. E. Powell

Author:F. E. Powell
Language: eng
Format: epub
Publisher: Spon & Chamerlain
Published: 1910-03-25T05:00:00+00:00

Fig. 4B.-Front Elevation of 10-foot Windi

the amount of work involved and the material employed. It is, however, a conservative estimate, and is based on the standard i6-mile breeze, which holds good for something like 8 hours per day on two-thirds of the days in the -year. Manufacturers probably rate a mill of this size much higher, and as long as no wind-velocity is stated, they may fairly claim to be correct. All practical modern windmills, however, are constructed with automatic gear so that with any given velocity of wind a maximum output is obtained, and any increase in the wind is more or less counteracted by the action of the automatic gear. It follows therefore that if our lo-foot mill is set to produce say ^ H.P., it can only do this with a wind of much higher velocity than i6 miles per hour, which is also much more rare. Nevertheless, it will be quite within the maker's power to get as much as this and more out of his machine, if he so desires and the wind is there. It will be merely a question of altering the controlling weight, but will also involve very much heavier stresses on the machine. This point must be borne in mind.

A general elevation is given in fig. 48, to a scale of J inch to the foot. The tower is built up of four 3 inches X 3 inches vertical members, 12 feet high, each placed at the corners of a square, with 4-inch space between each pair of uprights. These uprights are well braced by struts, also of 3 X 3 timber, starting below the circle of

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