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Hello, I’ve been working with rocket engine technologies several recent years as a technical expert. This brought me inspiration and determination to make a rocket by myself, starting from engine selection to full design. As usual, the first step would be the purpose of the system. It should...

Steel 12L14 is widely used in the production of precision instrument parts and it is not in the list of steel types to be hardened, according to it's purpose and composition. You may try for a thin part and see, how it goes and what is a result for you purpose. Why you might have to harden that...

Yes, the books are the sea of knowledge to learn and also to call for an adventure. To draw a path (a plan) for your future experiences. What I have learnt about wisdom, that it comes from brain-heart interaction. Brain may contain long term memories by only several neurons. Those memories are...

Disagree :) A good part of wisdom is made from own mistakes. This quote is missing it's context, probably.

Right "This was the Captain Samuel Vimes 'Boots' theory of socioeconomic unfairness" - Terry Pratchett's wise irony. The one who doesn't wear shoes, must be the richest man.

'Whenever I get the urge to exercise, I lie down until the feeling passes away.' - Mark Twain. It applies to any plan that has no: 'shut up and calculate!' stage.

Hello, community, I am looking forward to contributing discussions here. Thank you! skydelph