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Old July 4th 17, 07:19 PM posted to sci.space.policy,sci.physics
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Default Towards the *fully* 3D-printed electric cars.

In sci.physics JF Mezei wrote:
On 2017-07-04 09:11, Jeff Findley wrote:

composites when they were in their infancy. Today it would be quite
hard (i.e. likely impossible) to point to something commercial that
flies and carries people commercially that has absolutely zero composite
content.


Wouldn't the DC9s/MD80s still in use in the USA be devoid of composites?

And out of curiosity, since new 737s have maintained the "type rating"
of the 1960s 737s, how much of the plane can they convert to composites?

(there are issues with lightning protection for instance which require
different treatment, so not sure if that fits inside the same type rating).

And if they are using 3D printing to create metal parts, how does that
work exactly? Some pen pours molten titanium/whatever to create each
layer? Or is it more laser based to cut a solid block into the perfect
shape?


Metal powder deposition and laser or electron beam sintering.

BTW, metal powders tend to be explosive.

--
Jim Pennino