Hi George,air.command wrote:Yes, that is a tornado coupling. These ones give the full 22mm opening.tcarnahan wrote:By the way, did I see a tornado tube being used as a coupling in your picture? Maybe I am mistaken.
That depends on the type of tornado tubes you are using. The ones above we make from polypropylene and are very tough. They will handle 300psi without problems. On a recent crash the bottle necks screwed inside them smashed and completely broke away from the rest of the bottles, but the couplings were fine. It took a bit of work to unscrew the neck remnants from inside the couplings.tcarnahan wrote:I know you guys try to plan for high pressures. I didn't think tornado tube couplings would handle high pressure.
Last year we pressure tested the commercial tornado tubes that are made from a more brittle plastic and they were still holding 270psi. Though they would probably crack when subjected to a very hard landing.
Here it is undergoing pressure tests to 270psi.
http://www.aircommandrockets.com/images ... 2_04_s.jpg
What are commercial tornado tubes made from? Would they get stress cracks from pressurization like PET bottles?