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A comment on Aerospike Engines: Why aren't we using them now? [video]. Parent comment
Picture of blade and some process description: https://en.wikipedia.org/wiki/Turbine_blade
Picture of wax blade without cooling channels: https://en.wikipedia.org/wiki/Investment_casting
Company that uses DLP 3D printing for turbine blades: https://www.prodways.com/en/lost-wax-casting-of-turbine-blad...
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Picture of blade and some process description: https://en.wikipedia.org/wiki/Turbine_blade
Picture of wax blade without cooling channels: https://en.wikipedia.org/wiki/Investment_casting
Company that uses DLP 3D printing for turbine blades: https://www.prodways.com/en/lost-wax-casting-of-turbine-blad...