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Dhone

15 bytes removed, 04:11, 22 November 2012
→‎Construction, operations and maintenance
==Construction, operations and maintenance==
[[Image:Dhone drawing.jpg|thumb|right|250px|Mechanics of A variation on the dhone that includes a dhone, including the view of the internal flap valvescounterweight. Photo: Intermediate Technology Publications]]
Instead of using a treetrunk, a dhone may be made of several planks of wood which can be assembled in the field with bolts. Galvanized iron sheets can also be used. Very large dhones should not be used as the discharge is reduced with increasing dhone volume (presumably because some of the input watts are wasted in manipulating the larger/heavier device (plus water) and so the time per cycle is disproportionately increased).
Note also that it has already been observed that with increased lifts, the overall efficiency of water lifting is considerably reduced. This is likely to be due to a greater spillage with increased lift, in addition to impaired ergonomics.
==Costs==
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