Wyrlok wrote:Very nice design, and the epoxy is a good idea to insulate the shell. What would you use as a burst disk ? I guess it has to be strong enough to contain pressure but weak to break when it explodes.
One of my favorite burst disk materials was photo paper, it held pressure well and broke nicely when subjected to the full pressure of the ignited mix. There are other materials you can use though, aluminum foil is another favorite. You add or remove layers depending on the pressures you are using.
What a coincidence I have a set of 10 schrader valves coming from china in a week or 2. I didn't need them but I knew it could be useful some day. Wouldn't epoxy "unglue" from the shell in case of explosion ?
Epoxy construction can be very tough
if done properly with the right materials.
For the sake of completeness, here are examples from yours truly of
when it goes well, and when it
doesn't. Learn from my mistakes
i'll add normal-pressure hydrogen to the list
- need to produce hydrogen to fill the shells
- i could die
+ simple mechanism makes it easy to reload and reliable (except if the tube explodes)
One way to boost power without resorting to higher pressure is to use higher concentrations of oxygen. In a normal atmospheric pressure hybrid, what you have available is around 20% concentration of oxygen, so you can only use around 3% propane. If however you use pure oxygen, then you can effectively make a 5x hybrid without the need to pressurize.
The reason I didn't mention it previously however is that
pure oxygen is quite a dangerous thing to be handling.
I suppose if you're using
oxyhydrogen that you've generated from water through electrolysis at atmospheric pressure in small quantities then it is a safer option, but not one I have explored personally.
hectmarr wrote:This comes to mind to shoot small steel balls, without using air pump valves or rupture disc. It is a short weapon format.
I considered something similar
here with the pressure itself holding the o-ring but never tried it:
