Tank progress...

One possible solution for a light weight tank is re blowing a PET bottle.
The first experiment in that direction was a success.
Based on preliminary calculations and carbon overwrap it looks to generate a 1000 PSI burst tank with a peroxide MR of better than 19 and a 500 psi burst tank with MR of better than 25.
(Water MR would be: 15 and 20 respectively.)

You can see where the thermocouple measuring the bottle temperature left a mark on the bottom...


And the neck area is not quite right yet...