DotFisk » seal http://www.fisk.me.uk/blog A Blog About Water Rockets, Laser tag and many other things Tue, 20 Jul 2010 12:06:38 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Robinson Coupling Development http://www.fisk.me.uk/blog/2008/03/01/robinson-coupling-development/ http://www.fisk.me.uk/blog/2008/03/01/robinson-coupling-development/#comments Sat, 01 Mar 2008 17:35:28 +0000 Nick http://www.fisk.me.uk/blog/?p=9 Today I have been working on trying to get a better seal with the Robinson coupling. My original idea of putting a o-ring between the bottle and the nut is a utter failure. The o-rings are too soft and either get squashed out of the way or pushed through the hole. The rocket isn’t even water tight let alone air tight.

However I have been working on a new method today which seems to be working quite well. I am using bicycle inner tube to act as a rubber washer between the nut and the bottle. It seems to hold air up to about 30 psi, so its an improvement at least. I tried tightning the nuts some more, but they just seem to chew through the rubber. More research needs to go into this area but progress is being made.

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