: gold open access, : green open access

2019

V. Salma, F. Friedl, R. Schmehl: "Improving Reliability and Safety of Airborne Wind Energy Systems". Wind Energy, under review, 2019.

N. Krishnan, A. Viré, R. Schmehl, G. van Bussel, "An immersed boundary method based on domain decomposition". Computers & Fluids, under review, 2019.

A.A. Candade, M. Ranneberg, R. Schmehl: "Structural Analysis and Optimization of a Tethered Swept Wing for Airborne Wind Energy Generation". Wind Energy, under review, 2019.

F. Bauer, D. Petzold, R.M. Kennel, F. Campagnolo, R. Schmehl: "Control of a Drag Power Kite over the Entire Wind Speed Range". AIAA Journal of Guidance, Control and Dynamics, accepted, 2019. pdf

S. Rapp, R. Schmehl, E. Oland, T. Haas: "Cascaded Pumping Cycle Control for Rigid Wing Airborne Wind Energy Systems". AIAA Journal of Guidance, Control and Dynamics, pp. 1-18, 2019. doi:10.2514/1.G004246. pdf

P. Bechtle, M. Schelbergen, R. Schmehl, U. Zillmann, S.J. Watson: "Airborne wind energy resource analysis". Renewable Energy, Vol. 141, pp. 1103-1116, 2019. doi:10.1016/j.renene.2019.03.118.

R. van der Vlugt, A. Bley, M. Noom, R. Schmehl: "Quasi-Steady Model of a Pumping Kite Power System". Renewable Energy, Vol. 131, pp. 83-99, 2019. doi:10.1016/j.renene.2018.07.023.

M.A.M. Folkersma, R. Schmehl, A. Viré: "Boundary layer transition modeling on leading edge inflatable kite airfoils". Wind Energy, pp. 1-14, 2019. doi:10.1002/we.2329.

P. Thedens, G. de Oliveira, R. Schmehl: "Ram‐air kite airfoil and reinforcements optimization for airborne wind energy applications". Wind Energy, Vol. 22, No. 5, pp. 653-665, 2019. doi:10.1002/we.2313.

J. Hummel, D. Göhlich, R. Schmehl: "Automatic measurement and characterization of the dynamic properties of tethered membrane wings". Wind Energy Science, Vol. 4, pp. 41-55, 2019. doi:10.5194/wes-4-41-2019.

J. Oehler, R. Schmehl: "Aerodynamic characterization of a soft kite by in situ flow measurement". Wind Energy Science, Vol. 4, pp. 1-21, 2019. doi:10.5194/wes-4-1-2019.

G. Sánchez-Arriaga, A. Pastor-Rodríguez, M. Sanjurjo-Rivo, R. Schmehl: "A lagrangian flight simulator for airborne wind energy systems". Applied Mathematical Modelling, Vol. 69, pp. 665-684, 2019. doi:10.1016/j.apm.2018.12.016. pdf

S. Rapp, R. Schmehl, E. Oland, S. Smidt, T. Haas, J. Meyers: "A Modular Control Architecture for Airborne Wind Energy Systems". AIAA 2019-1419, AIAA Scitech 2019 Forum, San Diego, CA, 7-11 January 2019. doi:10.2514/6.2019-1419. pdf

2018

F. Bauer, R. M. Kennel, C. M. Hackl, F. Campagnolo, M. Patt, R. Schmehl: "Drag power kite with very high lift coefficient". Renewable Energy, Vol. 118, pp. 290-305, 2018. doi:10.1016/j.renene.2017.10.073. pdf

R. Schmehl, M. Schelbergen, P. Bechtle, U. Zillmann, S.J. Watson: "ERA5 reanalysis data for Airborne Wind Energy Resource Analysis". 4TU.Centre for Research Data, Dataset, 2018. doi:10.4121/uuid:646eaf3f-c90b-4f22-89bf-8986804def3c.

R. Borobia-Moreno, G. Sánchez-Arriaga, A. Serino, R. Schmehl: "Flight-Path Reconstruction and Flight Test of Four-Line Power Kites". AIAA Journal of Guidance, Control and Dynamics, Vol. 41, No. 12, pp. 2604-2614, 2018. doi:10.2514/1.G003581. pdf

M. Schelbergen, R. Schmehl: “Optimal Operation and Power Curve Estimation of a Pumping Airborne Wind Energy System”. 14th EAWE PhD Seminar on Wind Energy, Vrije Universiteit Brussel, Belgium, 18-20 September 2018. pdf

S. Rapp, R. Schmehl: "Vertical Takeoff and Landing of Flexible Wing Kite Power Systems". AIAA Journal of Guidance, Control and Dynamics, Vol. 41, No. 11, pp. 2386-2400, 2018. doi:10.2514/1.G003535. pdf

J. Wijnja, R. Schmehl, R. De Breuker, K. Jensen, D. Vander Lind: "Aeroelastic Analysis of a Large Airborne Wind Turbine". AIAA Journal of Guidance, Control and Dynamics, Vol. 41, No. 11, pp. 2374-2385, 2018. doi:10.2514/1.G001663. pdf

V. Salma, R. Ruiterkamp, M. Kruijff, M.M. van Paassen, R. Schmehl: "Current and Expected Airspace Regulations for Airborne Wind Energy Systems". In: R. Schmehl (ed.) "Airborne Wind Energy - Advances in Technology Development and Research", Springer Nature, Singapore, pp. 703-725, 2018. doi:10.1007/978-981-10-1947-0_29. pdf

P. Benhaïem, R. Schmehl: "Airborne Wind Energy Conversion Using a Rotating Reel System". In: R. Schmehl (ed.) "Airborne Wind Energy - Advances in Technology Development and Research", Springer Nature, Singapore, pp. 539-577, 2018. doi:10.1007/978-981-10-1947-0_22. pdf

P. Faggiani, R. Schmehl: "Design and Economics of a Pumping Kite Wind Park". In: R. Schmehl (ed.) "Airborne Wind Energy - Advances in Technology Development and Research", Springer Nature, Singapore, pp. 391-411, 2018. doi:10.1007/978-981-10-1947-0_16. pdf

U. Fechner, R. Schmehl: "Flight Path Planning in a Turbulent Wind Environment". In: R. Schmehl (ed.) "Airborne Wind Energy - Advances in Technology Development and Research", Springer Nature, Singapore, pp. 361-390, 2018. doi:10.1007/978-981-10-1947-0_15. pdf

R. Schmehl (ed.): "Airborne Wind Energy - Advances in Technology Development and Research". Springer Nature, Singapore, 752 pages, 2018. doi:10.1007/978-981-10-1947-0.

T. N. Dief, U. Fechner, R. Schmehl, S. Yoshida, A. M. M. Ismaiel, A. M. Halawa: "System identification, fuzzy control and simulation of a kite power system with fixed tether length". Wind Energy Science, Vol. 3, pp. 275-291, 2018. doi:10.5194/wes-2017-26.

M.A.M. Folkersma, R. Schmehl, A. Viré: "Fluid-Structure Interaction of Inflatable Wing Section". 13th OpenFOAM Workshop (OFW13), Shanghai, China, 24-29 June 2018. pdf

J. Oehler, M. van Reijen, R. Schmehl: "Experimental investigation of soft kite performance during turning maneuvers". Journal of Physics Conference Series, Vol. 1037, pp. 052004, 2018. doi:10.1088/1742-6596/1037/5/052004.

G. Sánchez-Arriaga, A. Pastor-Rodríguez, R. Borobia-Moreno, R. Schmehl: "A constraint-free flight simulator package for airborne wind energy systems". Journal of Physics Conference Series, Vol. 1037, pp. 062018, 2018. doi:10.1088/1742-6596/1037/6/062018.

2017

M. Diehl, R. Leuthold, R. Schmehl: "The International Airborne Wind Energy Conference 2017: Book of Abstracts". University of Freiburg, 192 pages, 5-6 October 2017. doi:10.6094/UNIFR/12994.

H. Bier, R. Schmehl, S. Mostafavi, A. Anton S. Bodea: "Kite-Powered Design-to-Robotic-Production for Affordable Building on Demand". Proceedings of the 34th International Symposium on Automation and Robotics in Construction (ISARC2017), pp. 566-570, Taipei, Taiwan, 28 June - 1 July 2017. doi:10.22260/ISARC2017/0078.

G. Sánchez-Arriaga, M. García-Villalba, R. Schmehl: "Modelling and dynamics of a two-line kite". Applied Mathematical Modelling, Vol. 47, pp. 473-486, 2017. doi:10.1016/j.apm.2017.03.030. pdf

2016

P. S Manoj: "Airborne wind energy technology - Potential alternative for clean energy". Atlantis Magazine, Vol. 27, Issue 1, 2016. pdf

U. Fechner, R. Schmehl: "Downscaling of Airborne Wind Energy Systems". Journal of Physics: Conference Series Vol. 753, pp. 102002, 2016. doi:10.1088/1742-6596/753/10/102002.

U. Fechner: "A Methodology for the Design of Kite-Power Control Systems". PhD thesis, Delft University of Technology, 2016. doi:10.4233/uuid:85efaf4c-9dce-4111-bc91-7171b9da4b77.

U. Fechner, R. Schmehl: "Flight Path Control of Kite Power Systems in a Turbulent Wind Environment". 2016 American Control Conference (ACC), pp. 4083-4088, Boston, MA, USA, 6-8 July 2016. doi:10.1109/ACC.2016.7525563. pdf

2015

R. Schmehl: "The International Airborne Wind Energy Conference 2015: Book of Abstracts". Delft University of Technology, 123 pages, 15-16 June 2015. doi:10.4233/uuid:7df59b79-2c6b-4e30-bd58-8454f493bb09.

U. Fechner, R. van der Vlugt, E. Schreuder, R. Schmehl: "Dynamic Model of a Pumping Kite Power System". Renewable Energy, Vol. 83, pp. 705-716, 2015. doi:10.1016/j.renene.2015.04.028. pdf

A. Viré, R. Schmehl: "How to harness wind energy with traction kites". Reviews in Environmental Science and Bio/Technology, Vol. 14, No. 1, pp. 1-4, 2015. doi:10.1007/s11157-014-9360-4. pdf

F. Friedl, L. Braun, R. Schmehl, M. Stripf: "Fault-Tolerant and Reliable Design of a Pumping Kite Power System". In: Energy, Science & Technology Conference 2015, Karlsruhe, Germany, p. 101, 20-22 May 2015. doi:10.5445/IR/1000044290. pdf

2014

R. Schmehl, R. van der Vlugt, U. Fechner, A. de Wachter, W. Ockels: "Airborne Wind Energy System". Dutch Patent Application NL 2009528. pp. 1-34, 2014. pdf

C. Grete: “The Economic Potential of Kite Power”. Leonardo Times - Journal of the Society of Aerospace Engineering Students 'Leonardo da Vinci', No. 4, pp. 10-11, 2014. pdf

U, Fechner, R. Schmehl: "Feed-Forward Control of Kite Power Systems". Journal of Physics: Conference Series Vol. 524, pp. 012081, 2014. doi:10.1088/1742-6596/524/1/012081.

A. Bosch, R. Schmehl, P. Tiso, D. Rixen: “Dynamic nonlinear aeroelastic model of a kite for power generation“. AIAA Journal of Guidance, Control and Dynamics, Vol. 37, No. 5, pp. 1426-1436, 2014. doi:10.2514/1.G000545. pdf

C. Jehle, R. Schmehl: "Applied Tracking Control for Kite Power Systems". AIAA Journal of Guidance, Control and Dynamics, Vol. 37, No. 4, pp. 1211-1222, 2014. doi:10.2514/1.62380. pdf

2013

A. Bosch, R. Schmehl, P. Tiso, D. Rixen: “Nonlinear Aeroelasticity, Flight Dynamics and Control of a Flexible Membrane Traction Kite". In: U. Ahrens, M. Diehl, R. Schmehl (eds.) "Airborne Wind Energy". Springer, Berlin Heidelberg, 2013. doi:10.1007/978-3-642-39965-7_17. pdf

J. Breukels, R. Schmehl, W.J. Ockels: "Aeroelastic Simulation of Flexible Membrane Wings based on Multibody System Dynamics". In: U. Ahrens, M. Diehl, R. Schmehl (eds.) "Airborne Wind Energy". Springer, Berlin Heidelberg, 2013. doi:10.1007/978-3-642-39965-7_16. pdf

U. Fechner, R. Schmehl: "Model-Based Efficiency Analysis of Wind Power Conversion by a Pumping Kite Power System". In: U. Ahrens, M. Diehl, R. Schmehl (eds.) "Airborne Wind Energy". Springer, Berlin Heidelberg, 2013. doi:10.1007/978-3-642-39965-7_14. pdf

R. Schmehl, M. Noom, R. van der Vlugt: "Traction Power Generation with Tethered Wings". In: U. Ahrens, M. Diehl, R. Schmehl (eds.) "Airborne Wind Energy". Springer, Berlin Heidelberg, 2013. doi:10.1007/978-3-642-39965-7_2. pdf

R. van der Vlugt, J. Peschel, R. Schmehl: "Design and Experimental Characterization of a Pumping Kite Power System". In: U. Ahrens, M. Diehl, R. Schmehl (eds.) "Airborne Wind Energy". Springer, Berlin Heidelberg, 2013. doi:10.1007/978-3-642-39965-7_23. pdf

U. Ahrens, M. Diehl, R. Schmehl (eds.): "Airborne Wind Energy". Springer, Berlin Heidelberg, 611 pages, 2013. doi:10.1007/978-3-642-39965-7.

2012

U. Fechner, R. Schmehl: “Design of a Distributed Kite Power Control System”. 2012 IEEE Multi-Conference on Systems and Control, Dubrovnik, Croatia, 3-5 October 2012. pdf

U. Fechner, R. Schmehl: “High level control and optimization of kite power systems”. 8th PhD Seminar on Wind Energy in Europe, Zurich, Switzerland, 12-13 September 2012. pdf

R. Schmehl: “Kiting for Wind Power”. Wind Systems, No. 7, pp. 36-43, 2012. pdf

R. Schmehl: “Large-Scale Power Generation with Kites”. Leonardo Times - Journal of the Society of Aerospace Engineering Students 'Leonardo da Vinci', No. 1, pp. 21-22, 2012. pdf

J.H. Baayen, W.J. Ockels: "Tracking control with adaption of kites". IET Control Theory & Applications. Vol. 6, No. 2, pp. 182191, 2012. doi:10.1049/iet-cta.2011.0037.

2011

S.G.C. de Groot, J. Breukels, R. Schmehl, W.J. Ockels: “Modeling Kite Flight Dynamics Using a Multibody Reduction Approach”. AIAA Journal of Guidance, Control and Dynamics. Vol. 34, No. 6, pp. 1671-1682, 2011. doi:10.2514/1.52686.

R. Schmehl: "Die Kraft des Drachens, Antwort auf Leserbrief". Erneuerbare Energien, No. 9, p. 133, 2011. pdf

R. Schmehl: "Die Kraft des Drachens". Erneuerbare Energien, No. 8, p. 64-69, 2011. pdf

R. Schmehl: "Kite Power Technologie". Windnieuws, No. 2, pp. 22-24, 2011. pdf

E.J. Terink, J. Breukels, R. Schmehl, W.J. Ockels: “Flight Dynamics and Stability of a Tethered Inflatable Kiteplane”. AIAA Journal of Aircraft, Vol. 48, No. 2, pp. 503-513, 2011. doi:10.2514/1.C031108. pdf

J. Breukels: "An engineering methodology for kite design". PhD thesis, Delft University of Technology, 2011. pdf

2010

E.J. Terink, R.F. Verheul: "Kiteplane Handbook - User guide for Kiteplane design, construction, modeling, simulation, operation and testing". Technical Report, TU Delft, August 2010. pdf

A. de Wachter: "Power from the skies - Laddermill takes Airborne Wind Energy to new heights". Leonardo Times - Journal of the Society of Aerospace Engineering Students 'Leonardo da Vinci', No. 4, pp. 18-20, 2010. pdf

J. Breukels, W.J. Ockels: "A Multi-Body System Approach to the Simulation of Flexible Membrane Airfoils". Aerotecnica Missili & Spazio (AIDAA), Vol. 89, No. 3, pp. 119-134, 2010. pdf

2009

R.F. Verheul, J. Breukels, W.J. Ockels: “Material selection and joining methods for the purpose of a high-altitude inflatable kite”. AIAA 2009-2338, 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Palm Springs, CA, USA, 4-5 May 2009. pdf

2008

P. Williams, B. Lansdorp, W.J. Ockels: “Optimal Crosswind Towing and Power Generation with Tethered Kites”. AIAA Journal of Guidance, Control and Dynamics, Vol. 31, No. 1, 2008. doi:10.2514/1.30089.

J. Breukels, W.J. Ockels: "Analysis of complex inflatable structures using a multi-body dynamics approach". AIAA-2008-2284, 49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Schaumburg, IL, USA, 7-10 April 2008. pdf

P. Williams, B. Lansdorp, W.J. Ockels: “Nonlinear Control and Estimation of a Tethered Kite in Changing Wind Conditions”, AIAA Journal of Guidance, Control and Dynamics, Vol. 31, No. 3, 2008. doi:10.2514/1.31604.

B. Lansdorp, R. Ruiterkamp, P. Williams, W.J. Ockels: "Long-Term Laddermill Modeling for Site Selection". AIAA-2008-6690, AIAA Modeling and Simulation Technologies Conference and Exhibit, Honolulu, Hawaii, 18-21 August 2008. pdf

P. Williams, B. Lansdorp, W.J. Ockels: “Modeling, Simulation, and Testing of Surf Kites for Power Generation”. AIAA 2008-6693, AIAA Modelling and Simulation Technologies Conference and Exhibit, Honolulu, Hawaii, USA, 18-21 August 2008. pdf

P. Williams, B. Lansdorp, W.J. Ockels: “Modeling of Optimal Power Generation using Multiple Kites". AIAA 2008-6691, AIAA Modelling and Simulation Technologies Conference and Exhibit, Honolulu, Hawaii, USA, 18-21 August 2008. pdf

2007

A.R. Podgaets, W.J. Ockels: "Laddermill sail - a new concept in sailing". International Conference on Engineering Technology (ICET 2007), Kuala Lumpur, Malaysia, 11-14 December 2007. pdf

A.R. Podgaets, W.J. Ockels: "Robust Control of Laddermill Wind Energy System". Wind Power Shanghai Conference, Shanghai, China, 1-3 November 2007. pdf

A.R. Podgaets, W.J. Ockels: "Comparison of two mathematical models of the kite for Laddermill sail simulation". IAENG World Congress of Engineering Computer Science, San Francisco, CA, USA, 24-26 October 2007. pdf

A.R. Podgaets, W.J. Ockels: "Flight Control of the High Altitude Wind Power System". 7th Conference on Sustainable Applications for Tropical Island States, Cape Canaveral, FL, USA, 3-6 June 2007. pdf

J. Breukels, W.J. Ockels: "A multi-body dynamics approach to a cable simulation for kites". Asian Modelling and Simulation (AsiaMS2007), Beijing, China, 8-10 October 2007. pdf

B. Lansdorp, W.J. Ockels: "Design and construction of the 4kW groundstation for the laddermill". 7th IASTED International Conference on Power and Energy Systems (EuroPES 2007), Palma de Mallorca, Spain, 29-31 August 2007. pdf

P. Williams, B. Lansdorp, W.J. Ockels: "Modeling and Control of a Kite on a Variable Length Flexible Inelastic Tether". AIAA 2007-6705, AIAA Modelling and Simulation Technologies Conference and Exhibit, Hilton Head, SC, USA, 20-23 August 2007. pdf

P. Williams, B. Lansdorp, W.J. Ockels: "Optimal Trajectories for Tethered Kite Mounted on a Vertical Axis Generator". AIAA 2007-6706, AIAA Modelling and Simulation Technologies Conference and Exhibit, Hilton Head, SC, USA, 20-23 August 2007. pdf

P. Williams, B. Lansdorp, W.J. Ockels: “Flexible Tethered Kite with Movable Attachment Points, Part II: State and Wind Estimation”. AIAA-2007-6629, AIAA Modelling and Simulation Technologies Conference and Exhibit, Hilton Head, SC, USA, 20-23 August 2007. pdf

P. Williams, B. Lansdorp, W.J. Ockels: “Flexible Tethered Kite with Movable Attachment Points, Part I: Dynamics and Control”. AIAA-2007-6628, AIAA Modelling and Simulation Technologies Conference and Exhibit, Hilton Head, SC, USA, 20-23 August 2007. pdf

B. Lansdorp, R. Ruiterkamp, W.J. Ockels: “Towards Flight Testing of Remotely Controlled Surfkites for Wind Energy Generation”. AIAA-2007-6643, AIAA Modelling and Simulation Technologies Conference and Exhibit, Hilton Head, SC, USA, 20-23 August 2007. pdf

J. Breukels, W.J. Ockels: "Numerical and Experimental Results of the Airflow in the Delft University KiteLab". AIAA 2007-3922, 25th AIAA Applied Aerodynamics Conference, Miami, FL, USA, 25-28 June 2007. pdf

J. Breukels, W.J. Ockels: "Design of a large inflatable kiteplane". AIAA 2007-2246, 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, HI, USA, 23-26 April 2007. pdf

J. Breuer, W.J. Ockels, R.H. Luchsinger: "An inflatable wing using the principle of Tensairity". AIAA 2007-2117, 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, HI, USA, 23-26 April 2007. pdf

A.R. Podgaets, W.J. Ockels: "Stability of Optimal Solutions: Multi- and Single-Objective Approaches". 1st IEEE Symposium on Computational Intelligence in Multicriteria Decision Making (MCDM 2007), Honolulu, HI, USA, 1-5 April 2007. pdf

J. Breukels, W.J. Ockels: “Past, present and future of kites and energy generation”. Power and Energy Systems Conference 2007, Clearwater, FL, USA, 3-5 January 2007. pdf

2006

A.R. Podgaets, W.J. Ockels: "Flight control and stability of a multiple kites tethered system".Renewable Energy 2006, Makuhari Messe, Chiba, Japan, 9-13 October 2006. pdf

W.J. Ockels, R. Ruiterkamp, B. Lansdorp: "Ship propulsion by Kites combining energy production by Laddermill principle and direct kite propulsion". Kite Sailing Symposium, Center for Wooden Boats/South Lake Union, Seattle, WA, 28-30 September 2006. pdf

B. Lansdorp, P. Williams: "The Laddermill - Innovative Wind Energy from High Altitudes in Holland and Australia". Global Windpower 2006, Adelaide, Australia, 18-21 September 2006. pdf

A.R. Podgaets, W.J.Ockels: "Problem of Pareto-Optimal Control for a High Altitude Energy System". 9th World Renewable Energy Congress (WREC IX), Florence, Italy, 19-25 August 2006. pdf

A.R. Podgaets, W.J.Ockels: "Three-dimensional simulation of a Laddermill". 3rd Asian Wind Power Conference (WindPowerAsia2006), Beijing, China, 28-30 June, 2006. pdf

B. Lansdorp, W.J. Ockels: "Design and construction of a 2 kW Laddermill groundstation". Wind Power Asia 2006, Beijing, China, 28-30 June 2006.

2005

J. Breukels: "ASSET and the world of kites". Leonardo Times - Journal of the Society of Aerospace Engineering Students 'Leonardo da Vinci', No. 4, pp. 12-13, 2005. pdf

J. Breukels, W.J. Ockels: "Tethered kiteplane design for the Laddermill project". 4th World Wind Energy Conference & Renewable Energy Exhibition 2005, Melbourne, Australia, 2-5 November 2005. pdf

B. Lansdorp, B. Remes, W.J. Ockels: "Design and testing of a remotely controlled surfkite for the Laddermill". 4th World Wind Energy Conference & Renewable Energy Exhibition 2005, Melbourne, Australia, 2-5 November 2005. pdf

B. Lansdorp, W.J. Ockels: "Design of a 100 MW laddermill for wind energy generation from 5 km altitude", 7th World Congress on Recovery, Recycling and Re-Integration, Peking, China, 25-29 September 2005. pdf

B. Lansdorp, W.J. Ockels: "Comparison of concepts for high-altitude wind energy generation with ground based generator". 2nd China International Renewable Energy Equipment & Technology Exhibition and Conference, Beijing, China, 25-27 May 2005. pdf

2004

W.J. Ockels, B. Lansdorp, J. Breukels, G. Spierenburg: "The Laddermill: work in progress". European Wind Energy Conference & Exhibition, London, UK, 22-25 November 2004. pdf

2002

S.L. Veldman, C.A.J.R. Vermeeren, H.E.N. Bersee, O.K. Bergsma: "Conceptual Design of a High Altitude Kite". 43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Denver, CO, USA, 22-25 April 2002. doi:10.2514/6.2002-1735.

2001

W.J. Ockels: "Laddermill, a novel concept to exploit the energy in the airspace". Aircraft Design, Vol. 4, No. 2-3, pp. 81-97, 2001. doi:10.1016/S1369-8869(01)00002-7.

1999

J.P. Meijaard, W.J. Ockels, A.L. Schwab: "Modelling of the dynamic behaviour of a laddermill, a novel concept to exploit wind energy". 3rd International Symposium on Cable Dynamics, Trondheim, Norway, pp.229-234, 16-18 August 1999. pdf