Presentation of the DNV GL certificate by Dr. Olaf Richter (right) in the presence of his inspector, Dieter Ekat (2nd from left) who supported the test series, to Piening boss Mathias Pein (2nd from ...
These strangely-shaped twisted-loop propellers look like a revolutionary (sorry) advance for the aviation and marine sectors. Radically quieter than traditional propellers in both air and water, ...
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