Otto and Fiedler became good friends after 3 years of letters sent from Brazil as Nelson was chasing his dream of learning from his aspirational mentor. Otto sees in Fiedler a young but mind setted engineer with a great future. Beyond those days at the pictures above, every project and every thought of membranes that Nelson had , he would share with Frei and ask for his opinion.

A bond was conjectured.

Intermediated by Nelson Fiedler, Frei Otto and Oscar Niemeyer met to talk about tensil structure and reinforced concrete. In the meantime many other aspects of life entered the conversation, from structures to love and music, the meeting was an exchange of knowledge between two of the most respected and famous architects in the world. Fiedler was amused by the geniality and the similarities of their lines.

História Fiedler
História Fiedler
História Fiedler
História Fiedler
História Fiedler
História Fiedler

“Frei Paul Otto (German: 31 May 1925 – 9 March 2015) was a German architect and structural engineer noted for his use of lightweight structures, in particular tensile and membrane structures, including the roof of the Olympic Stadium in Munich for the 1972 Summer Olympics.

Otto won the RIBA Royal Gold Medal in 2006 and was awarded the Pritzker Architecture Prize in 2015, shortly before his death. Until his death, Otto remained active as an architect and engineer. One of his more recent projects was his work with Shigeru Ban on the Japanese Pavilion at Expo 2000 with a roof structure made entirely of paper, and together with SL Rasch GmbH Special and Lightweight Structures he designed a convertible roof for the Venezuelan Pavilion. In an effort to memorialise the September 11 attacks and its victims as early as 2002, Otto envisioned the two footprints of the World Trade Center buildings covered with water and surrounded by trees; his plan includes a world map embedded in the park with countries at war marked with lights and a continuously updated board announcing the number of people killed in war from 11 September 2001, onward. Otto died on 9 March 2015; he was to be publicly announced as the winner of the 2015 Pritzker Prize on 23 March but his death meant the committee announced his award on 10 March. Otto himself had been told earlier that he had won the prize by the executive director of the Pritzker Prize, Martha Thorne. He was reported to have said, ‘I’ve never done anything to gain this prize. Prize winning is not the goal of my life. I try to help poor people, but what shall I say here — I‘m very happy.’

I have built little. But, I have built many castles in the air. Frei Otto


1979 Sr. Nelson Fiedler begins working on solar panels and then tensil estrucutures , unknown in Brasil till that time. Nelson is 19 years old, he is in the 2nd year of engineering school, contracts two employees and start working in his garage manufacturing small tents. Develops for apple II a software that allows transform 3D expressions in flat pannels to be weld in to the tensile shapes
1986 After meeting Frei Otto and taking him as a mentor Fiedler starts to build larger and more complex strucutures
1987 High computing power from “cray supercomputers” aquired in the University of Porto Alegre Brasil finite element software “ansys “ starts building larger structures
1997 Move the company to São Paulo to build for MTV, TV Globo and Rock in Rio
2003 Frei Otto visits Nelson and attends 1st Latin American Tensil Estructures feira at USP
2010 Professional management, Angel investors, harbour roof contracts and patents. A new cicle of growth meanwhile a J. V. for stadium roof is created.
2013 Starts production of 1st harbour roof, completed Maracana roof in record time in jv, new investors and register in CVM..
2014 Completes Beira Rio Stadium, Arena das Dunas Stadium, Maracanã and Fundao Stations.
2015 Wind mill developing started here.
2016 An energy spin of is created to develop wind mills.
2017 Develops FW 59 200 kw vawt wind mill.
2018 Sets running the 4th vawt prototipe FW 68 225 kw on February. Back to the solar panels structure developing.