While I wish them luck (anything to advance spaceflight is a good thing), I'm going to remain slightly skeptical until they do a full scale reentry test or release a lot more info about their design and expected flight profiles. It's one thing to feather like that at 50k ft and only going a few hundred km/h. It's totally different to do it when you're at orbital velocities of 27000 km/h.
I can understand it being a milestone and all, but I don't understand why unlock the tail plane to fold the craft up? All I see is high alpha. How does this added drag help?
I'm not sure I have this right, but my understanding is that they fly to the edge of the atmosphere, and this approach allows them to re-enter the denser atmosphere in a slow, controlled way avoiding the need for expensive thrusters and ablative heat shielding that something like a capsule might need.
The thing is, you
have to be going insanely fast to stay in orbit (see above). All of that energy and the velocity that comes with it has to be lost somehow. I don't really think the vehicle is going to be able to carry enough fuel to burn its engines to slow down. Capsule type spacecraft lose it via drag, letting the ablative shield absorb the energy. The shuttle does it via aerobraking, letting the thermal tiles deflect the energy. What's going to absorb all of that energy when SS1 reenters? I'm not sure.