Comments on: Alleviating COTS concerns

By: Donald F. Robertson

Donald F. Robertson — Tue, 22 May 2007 17:52:57 +0000

For what it’s worth, Rocketplane Kistler claims that they can handle the out-sized elements. I also believe NASA has an effort under way to develop a smaller, second generation replacement for the CMGs, though I’m not clear on how serious that is.

Also, while I would in no way want to undermine COTS, let us not forget that the Soyuz is at least as commercial as any existing American player, and probably as much so as a subsidized COTS. Energya is a publicly traded company comparable to French aerospace companies. The Space Station is already supporting a commercial launch industry, albeit not a domestic one, and it is hard to blame the Russian’s for the policy failures that resulted in this state of affairs. For those of us interested in the wider human future in the Solar System, rather than an exclusively American future per se, these are excellent developments whatever happens to the existing COTS efforts.

Also, the European cargo module is ridiculously complex and expensive, and my bet is that it is unlikely to be a serious contender if either COTS company succeeds in significantly reducing costs. Likewise, I think that Japanese space technology has so far proved too unreliable to rely on.

Notwithstanding all of that, an American future in the Solar System may well be critically dependent on COTS success, so we should do everything in our power to make sure there remains a market for COTS.

— Donald

By: richardb

richardb — Tue, 22 May 2007 17:09:04 +0000

As I understand Nasa’s plans, they intend to stock the station with CMG’s and other large pieces that are shuttle dependent and essential. Of course they can’t stock everything so given Nasa wants the station till around 2020, I’d say they are creating a lucrative market for outsized cargo.

Nasa must come up with viable plans once the shuttles are museum attractions. It would destroy their political base if the Station is unusable because the supply chain from earth is broken. For them, I see COTS and other private players as essential to Nasa.

By: Charles in Houston

Charles in Houston — Tue, 22 May 2007 13:36:56 +0000

What is most interesting, as ever, is what is NOT said. Certainly there will be a need for a lot of additional logistics to Station but the form of the logistics is the real “long pole in the tent” that people have seldom mentioned.

Even with HTV, ATV, and Progress we will have no way of getting Control Moment Gyros, solar panels, and other large and heavy items up to Station – especially the ones that are mounted outside the pressurized volume. The CMGs alone have required replacement and continue to make noise, vibrate, etc – indications that we had better start to think about additional replacements. How are we gonna get those items up to Station? If we need to replace other large items (and the list is long) that go outside the Station – how are those going to get up there without Shuttle?? Many of those items will not fit through any hatch.

So perhaps the COTS folks could count on a monopoly to deliver big and external items??