Costs can't be usefully calculated this way, as the crew compartment weight is likely more than that of the crew. Further, the propellant almost isn't isn't sulfur based, which would represent a large cost saving (albeit only for the final part of the flight).
Andrew On Wed, 28 Dec 2022, 19:22 olivier boucher, <olivier.bouc...@ipsl.fr> wrote: > > https://zephalto.com/en/ > > Zephalto is a start-up backed by the French spatial agency CNES that > positions itself on low-carbon and safe "space" travel in the stratosphere > at 25 km. I couldn't find what low carbon means on their web site, but I've > read a French media quoting 27 t CO2eq per passenger for one trip up to 25 > km (it doesn't sound that low ?!). Could this be a vehicle for delivering > SO2 or some other aerosol precursor to the stratosphere? The payload must > be fairly small and the cost pretty high. Smith and Wagner (2018, > https://iopscience.iop.org/article/10.1088/1748-9326/aae98d) give a cost > of 40,000 $/ton for balloons. It's worth a comparison: Zephalto annouces a > ticket price of 5000 € per passenger. Assuming a passenger weighs 80 kg, > that's about 60,000 $/ton but there is probably a huge potential for saving > when scaling this up. Worth considering if low carbon and reusable ? > > Olivier > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to geoengineering+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/geoengineering/1869838873.46965456.1672255369897.JavaMail.zimbra%40ipsl.fr > . > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to geoengineering+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAJ3C-04bfK%2BizCA0X9p%3Dz2a3azZVFLvZkh2pMnhhLtvCc%2BTVWQ%40mail.gmail.com.
