{"id":9290,"date":"2014-09-26T06:46:36","date_gmt":"2014-09-26T13:46:36","guid":{"rendered":"http:\/\/cafe.foundation\/blog\/?p=9290"},"modified":"2014-09-26T06:46:36","modified_gmt":"2014-09-26T13:46:36","slug":"learning-energy-regeneration-birds","status":"publish","type":"post","link":"http:\/\/cafe.foundation\/blog\/learning-energy-regeneration-birds\/","title":{"rendered":"Learning About Energy Regeneration from Birds"},"content":{"rendered":"

Phil Barnes has <\/span>one of the most fascinating web sites on the Internet<\/a>, combining his aerodynamic expertise and love of soaring birds with his radical approach to staying up perpetually (or until the pilot grows exhausted).\u00a0 Albatross, birds he\u2019s studied for decades, soar along the tops of ocean waves, seeking food for themselves and their broods, often traveling thousands of miles before setting down.\u00a0 They have the advantage of bifurcated brains, able to stay awake in one hemisphere of the brain while the other hemisphere nods off, a trait they share with dolphins.<\/span><\/p>\n

\"Phil<\/a>

Phil Barnes unveils his latest iteration of his Regenosaur at the ESA Western Workshop<\/p><\/div>\n

Would it be possible for humans to tap the energy in the air to soar for indefinite periods?\u00a0 Could truly fuel-free flight be a reality?\u00a0 Phil is betting both sides of his brain on an affirmative answer to that.<\/p>\n

His presentation at this year\u2019s Experimental Soaring Association Western Workshop in Tehachapi, California was more than an addendum to previous work in this area, but an expansion of the concept of regenerative soaring he and Taras Kiceniuk have pursued independently for years.\u00a0 Taras has demonstrated the plausibility of the idea with a model of his Regenerator aircraft<\/a>, actually increasing the amount of energy stored in the airplane\u2019s batteries after a long flight.<\/p>\n

\"Highlights<\/a>

Highlights of Regenosaur design<\/p><\/div>\n

Phil Barnes\u2019 latest iteration of his \u201cRegenosaur\u201d aircraft uses ideas from the Toyota Prius battery boost system, where 200 Volts rises to 600, propeller concepts that change the operation and \u201clook\u201d of formerly familiar propulsion systems, and application of the flying modes employed by large birds in using the least energy for the greatest gain.\u00a0 The airplane is not only different from what we\u2019re used to, but the manner of flying becomes a new arena in which to explore regenerative soaring.<\/p>\n

\"Regenosaur<\/a>

Regenosaur will share characteristics with large soaring birds, but won’t have to land to refuel<\/p><\/div>\n

Flight takes place in five stages; climb, cruise, pinwheel (at which the eight-bladed \u201cpropeller\u201d virtually disappears from the equation and the airplane flies at maximum lift-to-drag), regeneration at maximum efficiency and minimum sink, and regeneration at maximum capacity and minimum sink.<\/p>\n

Phil explains the distinctions for the two latter conditions: \u201cAlthough we include max-capacity regen here for study, only max-efficiency regen has competitive flight performance. In particular, while battery energy storage rate (last row) is highest with max-capacity regeneration, the total energy rate (dzt\/dt) increases most rapidly with max-efficiency regen. Nevertheless, max-capacity regeneration proves useful in many scenarios, including strong wave lift, slope lift, and final descent. Indeed, if the last encountered updraft is near the airport, landing with significant reserve could become routine. As already noted, ground windmilling (with a safety perimeter) may be sufficient to prevent loss of charge between flights. \u201c<\/p>\n

\"Phil<\/a>

Phil discusses use of a Toyota Prius-like boost circuit in place of a “chopper” or pulse-width modulation approach to controlling current flow to motors. \u00a0See his paper on his web site for a full explanation<\/p><\/div>\n

Regenosaur\u2019s success will depend on its being able to exploit rising air currents at a rate that will enable batteries to be recharged within the time frame of each thermal.\u00a0 The goal is to land with stored energy equal to or better than that on takeoff.\u00a0 A bird can find food to replenish its energy reserves.\u00a0 Regenosaur will feed from the air itself.\u00a0 This, coupled with the possibilities offered by new lightweight and reasonably efficient solar cells, could bring a new and exciting technology into sport and competitive soaring.<\/p>\n

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