Most of the concerns about a small pacific island don't apply to a launch site in the Riau Archipelago? Somewhere within a ~50 km circle of the lower tip of Bintan Island is about the best launch site we could ask for.
I don't think anyone's actually drawn them yet (although I
am working on it, but want to get it all correct and that means doing a lot of math for things like inert tank mass estimates).
The R-5 was something
@CyberFemme and I were actually sketching out during the hiatus, largely as a fun exercise. It might not be what the voters end up going with, but it's been a long-term goal that I'm woking towards and is pretty obvious when you approach our needs from first principles, i.e.:
- We probably want to put a crewed capsule around the size of current crew capsules into orbit. Soyuz is a good analogue for this. This means around 10 tons to orbit, as a first-order approximation.
- We're planning on being in space for the long haul, and can afford to (hopefully) think on a longer timeframe than "by the end of this decade" stuff where we favour short term, expendable systems and hastily converted ICBMs. This means we probably want to invest in reuse (which also has a lot of other benefits, e.g., we can observe what happens to engines after they've been flown, which will help development). As an aside, if Korolev comes back with another "do something insane in 5 years", I am officially voting we replace him with Glushko; I was always more of a fan of Proton anyways.
- The most technologically-simple way to reuse valuable parts of a rocket is engine pod recovery - it's basically just taking the Atlas ICBM's detachable engine shroud thingy, sticking a parachute on it, and making sure that the anticipated impact point doesn't have anybody standing in it. You don't even need any electronics or control systems beyond a simple time delay built into the parachute ejection charge. There is a bit of added effort in designing the engines so that they have a rated life long enough for this, but overall, not that hard. It also slightly changes the overall launch in that we want to be staging higher and faster than normal, but that's not significant.
- The rocket should be as heavily standardized as possible to encourage mass production.
- We're doing good work with propane, Hank Hill approves, we shouldn't change what works.
Aside from that, the design is largely up in the air; R-5 in a nutshell is just "rocket with engine pod recovery that we can use as our in-universe Soyuz-U analogue". Cyber and I are currently viciously arguing about the choice of first-stage engine cycle (I think staged combustion is better, she prefers expanders), but that's more a general thing and because we like chatting about rockets - I trust the voters will make the right choice and pick staged combustion when the time comes
And yes, 1 unit of payload is a metric Sputnik, or 100 kg.
That's the plan for the R-5, sorta; it's something that we'd be more-or-less locking in the design of (at least relative to the current "launch a dozen times then do a significant redesign of the rocket"; we'd still be iterating on the details) and churning them out en masse. "You can have the R-5 in any colour as long as it's #4C7F99" type of thing.
Yeah, but it is what it is. I'm hoping we can somehow negotiate it down to only needing stage 3 instead of stage 4, which is
far more achievable, but we may not get it.