Originally Posted by PAXboy
the Osprey is not a runaway success
Actually, it is quite successful and doing well. I invite you to check the calendar. The year is 2019, not 1999. They've gotten through that rough bit (which had some dark times) about
introducing new tech. I also suggest you look at V-280 Valor and think about how the future looks for tilt rotor. (Looks pretty good ...)
The coaxial rotor design concept isn't all that new. Kamov had two maritime helicopters that were serviceable (Helix/Hormone) but the trick they are going for in SB1 is to add the high speed flight end of the game to that basic idea. As noted above, that was tried 40 years ago with varying issues arising.
With a lot of new tech available, they can try again with greater hopes for success. They are also doing the crawl, walk, run thing: X2, S-97, now SB1.