What are the best channels for these purposes?
ICBMs, experimental aircraft, etc
Amy Shira Teitel. People who follow space related news might know her. She just released a book named Breaking the Chains of Gravity about pre-NASA US space programs. Quite interesting.
In the same vein False Steps didn't update in quite some time but the post are worth a read if you're into space history and weird-ass designs.
The author released a book as well but i didn't get it.
And for the two of you who don't know Scott Manley, here's his videos explaining the basics of orbital mechanics