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银色二级水火箭

2018-2-12 13:49| 发布者: dymodel| 查看: 228| 评论: 0|原作者: pilot

摘要: A while ago, someone on the water rocket list asked the question Why do water rockets ....LOOK LIKE BOTTLES??? Well, here is one that looks a little more like the sort of thing that you would pay  .. ...
A while ago, someone on the water rocket list asked the question "Why do water rockets ....LOOK LIKE BOTTLES???" Well, here is one that looks a little more like the sort of thing that you would pay £20.00 for in the shops. Schweppes were having a promotion using silver plastic 2 litre bottles so I managed to work my way through the contents of three of these.
The challenge here is to make a water rocket that uses parachute deployment that looks pretty neat and all from just three bottles (this stuff is expensive compared to my normal supply of plastic bottles :-)
Construction
With only three bottles to use as raw materials, I was going to have to be careful how I used the stuff. The rocket bottle and the NSA cone each take up a whole bottle so that leaves just one bottle for the fins.



Nose Cone
I made the nose according to the NSA design. Using a precious bottle (I would have to drink another 2 litres of expensive lemonade to get a replacement :-), I was particularly careful when I blew out the nose to the almost hemishpere that these bottles go to. I put around 30 holes in the low pressure area as shown in the picture on the right and taped the PTFE sheet into place.



鲜花

握手

雷人

路过

鸡蛋
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