Laddermill and David Hammond Shepard
- 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 altitudesDavid H. Shepard, father of our group member PJ ShepardIt 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:
Cited Patent Filing date Issue date Original Assignee Title US3924827 Apr 25, 1975 1975 APPARATUS FOR EXTRACTING ENERGY FROM WINDS AT SIGNIFICANT HEIGHT ABOVE THE SURFACE US3987987 Jan 28, 1975 Oct 26, 1976 Self-erecting windmill US4049300 Mar 31, 1976 Sep 20, 1977 Fluid driven power producing apparatus US4084102 Jan 19, 1976 Apr 11, 1978 Wind driven, high altitude power apparatus US4113205 Jun 7, 1977 Sep 12, 1978 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland Aerodynamic lifting mechanisms US4186314 Jul 13, 1978 Jan 29, 1980 High efficiency wind power machine US4309006 Jun 4, 1979 Jan 5, 1982 Tethered airfoil wind energy conversion system Referenced by Citing Patent Filing date Issue date Original Assignee Title US4859146 Apr 5, 1988 Aug 22, 1989 United sail windmill US4894554 Sep 15, 1988 Jan 16, 1990 The United States of America as represented by the Administrator of the National Aeronautics and Space Administration Cable suspended windmill US5040948 Mar 26, 1990 Aug 20, 1991 Coaxial multi-turbine generator US5646343 Mar 10, 1995 Jul 8, 1997 System and method for monitoring wind characteristics US5909859 Mar 6, 1997 Jun 8, 1999 Multi-rotor kite glider US6555931 Sep 14, 2001 Apr 29, 2003 Omnific International, Ltd. Renewable energy systems using long-stroke open-channel reciprocating engines US6683697 Dec 9, 1999 Jan 27, 2004 Millenium L.P. Information processing methodology US6914345 Jun 23, 2003 Jul 5, 2005 Rolls-Royce plc Power generation US7075673 Nov 6, 2003 Jul 11, 2006 EON-Net L.P. Information processing methodology US7184162 Apr 15, 2005 Feb 27, 2007 Eon-Net L.P. Information processing methodology US7259887 Apr 10, 2006 Aug 21, 2007 Eon-Net L.P. Information processing methodology US7317261 Jul 25, 2006 Jan 8, 2008 Rolls-Royce plc Power generating apparatus US7474434 Mar 16, 2007 Jan 6, 2009 Millennium L.P. Information processing methodology US7508088 Jun 30, 2005 Mar 24, 2009 General Electric Company System and method for installing a wind turbine at an offshore location US7570383 Mar 16, 2007 Aug 4, 2009 Glory Licensing LLC Information processing methodology US7619768 Oct 31, 2007 Nov 17, 2009 Glory Licensing LLC Information processing methodology US7672007 Oct 31, 2007 Mar 2, 2010 Glory Licensing LLC Information processing methodology US7709973 Sep 18, 2008 May 4, 2010 Airborne stabilized wind turbines system US7723861 May 14, 2009 May 25, 2010 Airborne stabilized wind turbines system US7750491 Nov 21, 2007 Jul 6, 2010 RIC Enterprises Fluid-dynamic renewable energy harvesting system US7821149 Dec 9, 2009 Oct 26, 2010 Airborne stabilized wind turbines system US7830033 May 3, 2010 Nov 9, 2010 Wind turbine electricity generating system US7923854 May 13, 2010 Apr 12, 2011 Wind turbines direct drive alternator system with torque balancing US8026626 Dec 29, 2010 Sep 27, 2011 Axial flux alternator with air gap maintaining arrangement US8066225 Jan 19, 2009 Nov 29, 2011 Multi-tether cross-wind kite power US8109711 Jan 7, 2009 Feb 7, 2012 Honeywell International Inc. Tethered autonomous air vehicle with wind turbines US8178992 Aug 25, 2011 May 15, 2012 Axial flux alternator with air gap maintaining arrangement
- It was unintentional ... the miss of including mention of the recent interest in various laddermill concepts by 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/
Utilization a Flow Energy and Power Installation Filed:
September 6, 2001
- 2004 Aug.16-19.
Utilization of Wind Energy at High Altitude wherein
arguments for groundgen over flygen were presented along with other
concepts. A preference for using "closed loop, modern composite
fiber cable" was expressed.
- 2001 Transport: (click image for full instructions)
"Alex is an engineering polymath and major figure in Kite Energy,
with one of the few "superpatents" (most AWE patents are weak),
potentially a key player. "
- See: New Technologies and Revolutionary Projects
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.
- 2001 Method of Utilization a Flow Energy and Power Installation Filed: September 6, 2001
- 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.