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Laddermill and David Hammond Shepard

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  • Joe Faust
    We know of Doug Selsam s late 1970s notarized note and drawing of the vertical laddermill concept. And we have astronaut professor Wubbo Ockels with his late
    Message 1 of 3 , Jan 1, 2013
      We know of Doug Selsam's late 1970s notarized note and drawing of the vertical laddermill concept. 
      And we have astronaut professor Wubbo Ockels with his late 1990s entry to the concept space. 
      But undersung perhaps is David H. Shepard and his almost forgotten patent which is very different from his airborne wind-dam patent. 

      Here is his stark flying laddermill with distinct large-seeming pilot lifters to assure work:

      Apparatus for extracting energy from winds at high altitudes

       David H. Shepard, father of our group member PJ Shepard

      It is an interesting RAD study to trace the incoming impacts via the patents that have so far referenced this Shepard patent; see list below that would only grow as further patents cite this subject patent in future moments. 

      Click image for full patent.      Discuss claims, etc. 
              David H. Shepard seems to have cited earlier work: 

      Citations

      Cited PatentFiling dateIssue dateOriginal AssigneeTitle
      US3924827Apr 25, 19751975APPARATUS FOR EXTRACTING ENERGY FROM WINDS AT SIGNIFICANT HEIGHT ABOVE THE SURFACE
      US3987987Jan 28, 1975Oct 26, 1976Self-erecting windmill
      US4049300Mar 31, 1976Sep 20, 1977Fluid driven power producing apparatus
      US4084102Jan 19, 1976Apr 11, 1978Wind driven, high altitude power apparatus
      US4113205Jun 7, 1977Sep 12, 1978The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandAerodynamic lifting mechanisms
      US4186314Jul 13, 1978Jan 29, 1980High efficiency wind power machine
      US4309006Jun 4, 1979Jan 5, 1982Tethered airfoil wind energy conversion system
              Referenced by
      Citing PatentFiling dateIssue dateOriginal AssigneeTitle
      US4859146Apr 5, 1988Aug 22, 1989United sail windmill
      US4894554Sep 15, 1988Jan 16, 1990The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationCable suspended windmill
      US5040948Mar 26, 1990Aug 20, 1991Coaxial multi-turbine generator
      US5646343Mar 10, 1995Jul 8, 1997System and method for monitoring wind characteristics
      US5909859Mar 6, 1997Jun 8, 1999Multi-rotor kite glider
      US6555931Sep 14, 2001Apr 29, 2003Omnific International, Ltd.Renewable energy systems using long-stroke open-channel reciprocating engines
      US6683697Dec 9, 1999Jan 27, 2004Millenium L.P.Information processing methodology
      US6914345Jun 23, 2003Jul 5, 2005Rolls-Royce plcPower generation
      US7075673Nov 6, 2003Jul 11, 2006EON-Net L.P.Information processing methodology
      US7184162Apr 15, 2005Feb 27, 2007Eon-Net L.P.Information processing methodology
      US7259887Apr 10, 2006Aug 21, 2007Eon-Net L.P.Information processing methodology
      US7317261Jul 25, 2006Jan 8, 2008Rolls-Royce plcPower generating apparatus
      US7474434Mar 16, 2007Jan 6, 2009Millennium L.P.Information processing methodology
      US7508088Jun 30, 2005Mar 24, 2009General Electric CompanySystem and method for installing a wind turbine at an offshore location
      US7570383Mar 16, 2007Aug 4, 2009Glory Licensing LLCInformation processing methodology
      US7619768Oct 31, 2007Nov 17, 2009Glory Licensing LLCInformation processing methodology
      US7672007Oct 31, 2007Mar 2, 2010Glory Licensing LLCInformation processing methodology
      US7709973Sep 18, 2008May 4, 2010Airborne stabilized wind turbines system
      US7723861May 14, 2009May 25, 2010Airborne stabilized wind turbines system
      US7750491Nov 21, 2007Jul 6, 2010RIC EnterprisesFluid-dynamic renewable energy harvesting system
      US7821149Dec 9, 2009Oct 26, 2010Airborne stabilized wind turbines system
      US7830033May 3, 2010Nov 9, 2010Wind turbine electricity generating system
      US7923854May 13, 2010Apr 12, 2011Wind turbines direct drive alternator system with torque balancing
      US8026626Dec 29, 2010Sep 27, 2011Axial flux alternator with air gap maintaining arrangement
      US8066225Jan 19, 2009Nov 29, 2011Multi-tether cross-wind kite power
      US8109711Jan 7, 2009Feb 7, 2012Honeywell International Inc.Tethered autonomous air vehicle with wind turbines
      US8178992Aug 25, 2011May 15, 2012Axial flux alternator with air gap maintaining arrangement



    • Joe Faust
      It was unintentional ... the miss of including mention of the recent interest in various laddermill concepts by Bolonkin: Alexander Bolonkin [Contact by AWES
      Message 2 of 3 , Jan 3, 2013
        It was unintentional ... the miss of including mention of the recent interest in various laddermill concepts by Bolonkin: 

        Alexander Bolonkin  
        [Contact by AWES community in 2012 by the coordinated efforts of Dave Santos and Shawn Thomas! Great!]

        His home site: http://bolonkin.narod.ru/


        Alexander Alexandrovich Bolonkin                  
        Bolonkin, Alexander     |    AWES5674  | AWES6624

        The lifted ladder means:

        The two-loop lifted loop of drag wings

        Fan-belt driven by laddermill which is starkly lifted with pilot-lifter kite system.

      • Joe Faust
        My incomplete study of documents begs to define who expressed or failed to express a ladder loop AWES that has driving crosswind (though path is in the
        Message 3 of 3 , Jan 5, 2013
          My incomplete study of documents begs to define who expressed or failed to express a ladder loop AWES that has driving crosswind (though path is in the vertical direction) airfoil rungs during the down-going part of the loop.   Each author did or did not have text that described that the down-going rung airfoils could be driving strongly with the lift characteristics of the airfoils and not just set to low-reaction angle of attack?

          [ ] Did Selsam?      
          [ ] Did Shepard?
          [ ] Did Ockels?
          [ ] Did Bolonkin?

          I invite living authors to speak first with reference.   And I invite analysts to argue on the yes or no side of the question per ladder author-explorer. In group we have glanced at a full-on-all-parts-of-loop-ladder in strong lift-driving-crosswind mode (except at upper and lower transition zones); but is there supporting text about each of the four listed authors on the matter.   Or did they neglect to look at the opportunity of lifting airfoils on the down-going part of the ladder's loop?     Especially when a stark strong lifter kite subassembly (perhaps kytoon LTA or not) aids in holding the working ladder loop, the down-going set of rung airfoils may be strongly lifting with the lift vector pointing down to help the loop keep rotating. 

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