Viesturs Lācis wrote: > > Unfortunately, this link does not really answer, how exactly the > propellers were made, because I also think that those curved surfaces > are pretty tricky to get. Unless they cast them in molds. They cast them in bronze, but made them oversize. Then, they had a bunch of "lofts" I believe they were called, scaled up from the drawings, probably made of wood. These were laid over the blades at the appropriate distance from the hub and the gap was sighted. Grinders were used to remove material, and then the lofts were test-fitted again. Eventually, the lofts showed the curve was correct and they moved to the next blade.
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