[EMAIL PROTECTED] wrote: >Gentlefolk, >Also, ice, at cryogenic temperatures, is very strong in compression. >Hmmm. If H2O2 ice is similar, one could (in principle) freeze the HTP hard, >vacuum-wrap a mylar balloon over the icicle, and get out of the lower >atmosphere that way. > My suspicion is that the mylar would tend to come away from the fuel as the fuel melts just under the mylar due to aerodynamic surface heating, and then you'd probably face issues with the mylar rippling and tearing; also the liquid will tend to pool towards the bottom of the rocket 'tank'.
However you may be able to drill holes in the fuel and suck the mylar up against the ice. That way the fuel will melt and head off towards the rocket engine and the mylar may be held in position somewhat by the ice underneath. Still, there's going to be issues with tension too- can mylar take the drag forces? > Eventually, the "tank" woud expand like a balloon as >the peroxide melts and develops vapor pressure, but then pressure would carry >the load and you'd be out of the drag regime so the expansion of the tank >wouldn't matter. > Sounds good. > Let's see, at a gram per square meter, an HTP mylar >balloon tank ten meters tall and three meters in circumference would weigh 30 >grams. That's a nice mass fraction ;-). > Yeah I could live with that. Wonder what thrust/mass ratio a peroxide engine can manage is? That will limit the mass fraction. LOX/Kero is upto 130:1, not sure what HTP/Kero manages. And SSTO needs maybe 2-5 g's at liftoff to make orbit. >--Best, Gerald > _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
