> collective pitch coaxial helicopter Yep, that's it! I see some drone videos with exactly what I was imagining. Russian KA-52 looks like full size version. I

> collective pitch coaxial helicopter Yep, that's it! I see some drone videos with exactly what I was imagining. Russian KA-52 looks like full size version. I didn't know about swash plates but that's basically what I had in mind.