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After assembly by Watson Steel, the result was a smooth and continuous surface fabricated with significant reduction in assembly hours and weld lines when compared to the initial conic construction logic. Figure 7: Formed ribbon and helix plates after production. 50 Vision to Reality - the Materialization of the London Cable Car Figure 8: Tower assembly. Figure 9: Ground level view of South Tower. P. Feldmann, J. Mason, R. J. Terpstra Figure 10: Bird's eye view of South Tower. 4 Compression Towers An equally challenging exercise was undertaken to develop the design of the 15m tall compression towers The V -shaped towers, one located in front of each station, support the connection yokes that tension the cable profile.

To meet the tight program and budgetary constraints, we developed the design based on single curved cones that enabled the towers to be fabricated with conventional rolling whilst maintaining the elegance of the original design. The challenge lied in establishing the cone's apex, its base construction plane and radius. Initially, hand sketches were used to define and analyse the geometric problem and identify the rules that would drive the final form. The solution was later reconstructed algorithmically in Grasshopper for fine-tuning.

Isvoranu, H. Pottmann, and J. Wallner 3 Results Limitations. The approximation procedure described in this paper has some limitations - this is only to be expected if the feature size of the reference surface is of the same magnitude as the strip width. Figure 11 shows an example where the constant width of strips which was achieved during the initialization phase did not survive the second optimization stage. Our experience shows that the conoidal property (which we consider the most important in the context of this paper) does not seem to be a great restriction - see the comparison provided by Figure 12.

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