[Tagging] metal bladed windmills for water pumps
johnw at mac.com
Tue Jun 13 10:35:58 UTC 2017
> On Jun 13, 2017, at 6:21 PM, Martin Koppenhoefer <dieterdreist at gmail.com> wrote:
> Those windpumps seem completely traditional as well.
- windpump: is a small mass-produced (usually metal) fan disc, gearbox, and scaffold. They follow the wind via a vane on the back. It is a man-made tower.
- windmill: a building with a large (usually 4 blade) fan disc on the top, which operates some kind of machinery in the bottom of the structure. They have to manually be turned to follow the wind (if they can turn at all). It is a building.
"Windpumps" are mass produced (usually metal) erections that have a 2-4m multi-blade (10+) metal (or wood) fan disc that turns a gearbox suited for pumping water, usually through a shaft that extends down from the gearbox through an open lattice tower to the ground. These are a product of the industrial revolution or later. These are not (usually) an enclosed structure, usually made of steel support members like many types of power towers, usually between 5-15m in height. Wind pumps often have a metal vane to keep them automatically pointed into the wind, as they can easily pivot on their small gearbox. "Erection" is a key word here - they are similar to power towers or signposts, and often not much larger than a modern telephone pole.
Windmills are usually a [large] building - often stone or wood - with a large windmill on top, often with 4 wood & fabric blades, and the tool it operates (traditionally a mill) housed in the bottom of the structure. These usually predate the industrial revolution[afaik], and are in the same vein as traditional water wheels used to drive machinery. Modern versions are often recreations meant to mimic the traditional design, often made of modern materials, but meant to look like the pre-industrial revolution windmill buildings. "Building" is the key word here - as most have an enclosed working space in the bottom.
Traditional windmills rarely pivot to follow the wind, and are manually turned if they can, as they do not have a vane and a very heavy.
Neither are modern power generating wind turbines.
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