电子信息工程学院地址:水火箭制作高级篇
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水火箭制作高级篇
制作, 高级, 火箭记前一篇水火箭制作后,再来一篇水火箭制作的高级篇:Robinson Coupling
Robinson couplings.
Diagram of how the coupling fits together.
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Now slide the lower sleeve over the main bottle, sandwiching the washer between the two bases.
Fit the Robinson coupling through the two bottles with the appropriate washers inside and out (see video) and tighten the coupling. The glue is not really necessary here as the coupling holds the bases together. You can add the glue if you wish to help fill the gap between the bases.
Screw in another bottle into the Robinson coupling and fill the two bottles with cold water so there is no air left in the bottle. Screwing in a small 600ml bottle makes it easier to handle during the shrinking process. This bottle is only temporary to hold the water in. Try not to get water between the sleeves before shrinking.
Now we shrink the sleeves. There are a number of ways you can achieve this for example using a heat gun, hot water or as we prefer is doing it over a gas kitchen stove. Hot water would be the last option as it is dangerous and also tends to give less ideal results. It is always important to continue to rotate the bottle over the heat source so that you get an even rate of shrinking.
Start by shrinking the lower sleeve where it overlaps the upper sleeve. This helps lock the lower sleeve in place preventing it from sliding off as you shrink the rest of it. Rotate the bottle and work your way towards the base. And then return to the upper sleeve and shrink that. The upper sleeve won't need much shrinking since it is a tight fit already.
Make sure that the sleeves are shrunk as evenly as possible and that the gap between the two bottles at the base is either completely eliminated by shrinking or the glue fills the gaps that cannot be shrunk.
If you used glue, then let the glue cure for a few days before pressure testing.
NOTE: The Robinson couplings we use for these reinforced bottles use a lid with a longer uninterrupted thread compared to the standard bottle lid. We also have a reinforcing ring over the top of that to prevent the cap from distorting when tightened. .
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