Cast Double Shoe-box Rocket using User-Friendly Cheap LTGS Feb 23, 2018 6:37:00 GMT -8 via mobile pinhead, esbjornaneer, and 2 more like this
Post by briank on Feb 23, 2018 6:37:00 GMT -8
briank and peterberg to comment as their joint comments in another thread asked Karl playing with geopolymers to build a batch box stove to proove that the geopolymers are up to the job. I am on that quest and wonder what the specifications are, from their point of view, for a material to cope with the rocket environment.
Is it so many fires? So many years of use? Such abrasion resistance? Such outside wall of core temp?
What else that needs to be shown before it can be recommended for use in an indoor rocket installation?
First and foremost, someone needs to actually do one from start to finish and document it. Until then it can’t be recommended to do it yourselfers. Has such been documented yet? Secondly, it needs to stand up to prolonged burn cycles, and without any evidence of actual or impending catastrophic failure, especially the roof of the firebox. Resistance to various temps is pointless until a working model with some evidence of longevity and documentation is achieved. Third, it needs to be shown that this can be done using standardized recipes and techniques that are well documented and illustrated and easily and reliably repeatable without long or expensive periods of experimentation.
People are building these and placing them in the middle of their homes. We have already and completely established that commercial refractory materials can be used satisfactorily without endangering the end user, and they’re readily available and relatively affordable.
Before recommending their use inside the home, we need some kind of documentation of the use and repeatability of geopolymers in the construction of rocket heaters. There is too much liability involved (both moral and legal) to do otherwise. (In case you’re wondering, every Continuing Medical Education conference I’ve attended every year for the last 25 years has had presentations on liability, and I had to complete separate yearly online liability courses for my malpractice insurance, so it’s something that’s always been in the back of my mind. Doctors have been successfully sued over casual advice they gave to a total stranger at a cocktail party, and I know for a fact that there are liability issues for a forum based on recommendations made there. Forum admin have a moral and legal requirement to air appropriate precautions/warnings regarding something with these levels of danger should catastrophic failure occur.)