- Location
- Mid-Atlantic
Well yes. The problem is that the overall flight mission profile for using the nuclear ramjet (plus ancillary orbital maneuvering thrusters) to launch, enter orbit, return to base, and land is at minimum going to be on the order of 2-3 hours, and orbital mechanics forces some further constraints.How fortunate then that DAWN SHEPHERD also has an explicit line in the concept about how it can travel beyond the atmosphere if needed, allowing it to also launch attacks on asteroid fragments before they re-enter, and if they really need to the whole nuclear ramjet part means that sending them "around the world" is entirely within their range (if a suborbital hop doesn't do the same thing faster while also maybe getting a shot on it while exo-atmospheric).
It's just... fairly plausible, even foreseeable, that we'll be needing these things to be in more than one place at one time.
The trick with the reflector satellites is that the laser can fire at any time, and the reflector satellites are always just passively up there, and both the mirrors and the laser cannon itself are adjustable, aimable systems that can be redirected to point at targets of our choosing. We can shoot at one target, then shoot at a different and widely separated target a minute or two later. There's no 2-3 hour time delay in which the entire weapon system is unavailable after being launched to engage a single target.Because we would build them to be able to? That's kind of like asking: "How are you going to intercept all the asteroid fragments we're going to over the two weeks with just a single laser emitter and some reflector satellites?" The answer is that we figured out how we would need to build them in order to pull that off, then did it.
DAWN SHEPHERD is still a perfectly viable concept, mind you. It's just that if only one fighter is available at a time, then I suspect that one fighter isn't going to be able to provide the kind of potentially-global coverage we need to prevent tsunamis from hitting our shores.
Honestly, I'm picturing something that much more closely resembles a hybrid between a vastly scaled-up version of the X-43, the Space Shuttle, and the Lockheed YF-12.From your criticism and cost assumptions sounds like you've got this idea in your mind that it's going to be just something like a souped up nuclear F15 or MiG 25 or something flying around to shoot the fragments down. I don't expect these to be anything like conventional interceptors, because they're not being designed for anything approaching a conventional interception mission.
The trouble is that no matter how amazing the interceptor itself is, unless it's able to teleport or has a science fiction propulsion system on the level of, say, an X-Wing... it can only be in one place at one time for purposes of its intended mission, and it's got a fairly stiff minimum sortie time requirement.
Given the number of Ulysses fragments that are coming down, I find it somewhat optimistic to suppose that there will only be a need for one or even two fighters to be aerospace-borne engaging such targets at any one time, given the more or less minimum physically possible turnaround time of three-ish hours for the craft to take off, orbit the Earth once, land, and have any time at all to reload.Except that we don't need to hit any target anywhere in the world over a 24 hour stretch, only any asteroid fragment that is 1) landing in a place that would actually threaten us with a tsunami over on the other side of Antarctica, and 2) actually of large enough size to cause a threatening tsunami to hit us from the distance it impacts. That's a much easier task to accomplish on our end, everything else isn't a threat we need to send a missile at.
What it comes down to, for me, is that I expect the interception situation to be pretty hectic, with a need to engage lots and lots of targets, basically, not just a few.