Figure 5 of Payne and McCutchen's
patent US 3987987
https://patents.google.com/patent/US3987987
- US3987987
- The figure 5 of the patent has been robustly discussed in
old-forum posts.
- kPower has considerable portfolio of experiments over the Fig. 5 matter.
- Cousin study for triplet-tether: Assessment of an Alternative Concept for a High-Altitude Wind-Power Generator
- Parallel discussion
- 3r Airborne Wind Energy
Max Langbein, Nicolas R. Gauger, Maja Ruby
Goal: Try out/show the feasibility of an airborne wind energy plant without pull-back phase using a special ground station. - http://davincienergy.ca/
Chris Carlin AWE R&D lesson; great Fig-5 Similarity Case
Senior Boeing Engineer, Chris Carlin, is a key mentor to many of us in AWE a decade ago. His long and heroic career was full of major aerospace research, like developing large scale wind turbine reliability, and flying full size airliners as drones, for fiery crash tests.
Perhaps Carlin’s most valuable lesson to AWE R&D was to seek Engineering Similarity Cases to heuristically assess feasibility, and to reuse engineering methods. In AWE, this started with study of giant industrial trawling nets, as mega-kite analogues.
Finding Similarity Cases continues to help us find ways forward in AWE. The latest is a USP3987987 Fig-5 Similarity Case, Reaction Ferries, rigged similarly as a cross-current paravane at MW scale. Reaction Ferries have been around for centuries, and prove the Fig-5 cable-rig works quite well, at a substantial scale:
Reaction_ferry
===========================
Ed adds: Mooring Engineering
Leonardo's fig5 paravane
Fig5-variant kite translating along arch-line, cargo bridge:
Traghetto di Leonardo, Italy, a historic reaction ferry attributed to Leonardo. Fig5 paravanes in fact date back centuries over large regions. Estimating larger later versions operating in strong rivers can approach 1 MW. An optimized parafoil model could zip across. Will try J-foil across a stream on a tight line, to go hot. Reaction can pump irrigation too. Reaction_ferry
================================ Ed adding:
http://davincienergy.ca/reaction-ferries/
http://davincienergy.ca/wp-content/uploads/2015/09/Dual_100.gif
Fig-5 crosswind power-kite cableway motion is a great testing contender.
Max Langbein's wide anchor trajectory surface offers optimal cosine gain. What a great paper, calculated numeric superiority along with key operational concepts for tow-launching and flying in calm.
kPower prediction: 3r project will match tested result to numeric prediction. Fig-5 motion by tri-tether is a top AWES method.
Reaction Ferry fig5 Similarity Cases
Same topology as Figure 5 [US3987987] kites has worked powerfully for centuries:
Reaction ferry
http://www.energykitesystems.net/AirborneWindEnergy/images/Fig5demoDaveSantos.png
