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The Flame Jet Drill is a type of drilling equipment whereby there is no contact with the drilling surface, therefore the drill never wears down. The tool expels an ultra hot hydrogen flame (~4000 °C)〔 which causes small inconsistencies in the rock to fracture and fly away and thus "drill" surface. Another prototype drill called a Hydro Jet Drill is able to work in hot damp conditions by superheating water and spraying the rock with the fluid. The devices were featured in a National Geographic documentary "MegaStructures: Deep Earth Drillers" about geothermal energy. 〔 080712 natgeotv.com.au List of National Geographic MegaStructures series.〕 == References == * (freepatentsonline.com - Flame Jet Drill Patent ) * (Flame Jet Drilling and Chambering to Great Depths in Crystalline Rock ) * (US Patent 4066137 ) * (Journal of Mining Science ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Flame jet drill」の詳細全文を読む スポンサード リンク
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