NASA thrust rocket chamber fabrication - photo

Original caption: "FABRICATION TECHNIQUES USED IN 5000 POUND THRUST ROCKET CHAMBER WITH LONGITUDINAL PASSAGES"

Fullsize image: https://s3-us-west-1.amazonaws.com/h...g_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h..._machining.jpg


Previously:

https://www.homemadetools.net/forum/...053#post160683
https://www.homemadetools.net/forum/...874#post152596
https://www.homemadetools.net/forum/...493#post110756
https://www.homemadetools.net/forum/...245#post141922
https://www.homemadetools.net/forum/...055#post157221

Ok, that's a mandrel, but the de Laval nozzle is a wire-form? I would've bet all on being spun.

it could be a tube wall nozzle. cooled to prevent structural failure. in the 1950's and 1960's, long before before additive manufacture (3d printing by selective laser sintering).