| Author | Message | ||
     Anonymous |
I think that you should have a section about launching 2-liter pop bottles. They're really fun, cheap, and they fly REALLY high! You can make a launcer, fill the bottle about 1/2 up, pump it up to about 65 lbs/sqr in. and let her fly. They go amazingly high, especially if you make the body aerodynamic and add fins. | ||
| ABCinventor |
hey this idea isdeveloped by my team too!!! read this that i posted in the "i have trouble making one of the toys" section it reads: "Simon, my friend and i would like to post a project that we had made last year during the holidays. it is a water rocket launcher that lunches soda bottles into the air to an alttitude of about 15 metres (MAX). the energy comes from a hand pump. with every strokes, more air is inserted and compressed into the launcher and eventually, the rocket shoots right up into the sky. but because it is a prototype, it is not very perfect. during pumping, a person has to hold the tip so that the bottle doesn't shoot out before it is being pumped to the optimum pressure. also because the tip of the launcher is a little smaller than the mouth of the bottle, we have to fix it with a few rounds of masking tape. there is a sharp aluminium rod that allows it to be inserted into the ground and operated with a single man but more masking tapes have to be used to make the bond stronger for the optimum pressure." | ||
| Anonymous |
My rocket flew WAY higher than 15 meters! Here's my launcher:  You slide the rocket down the tube. Then you slide the pvc up. This causes the plastic things to grab the neck. When you pull the string, it pulls the PVC down, the plastic things release, and the rocket shoots up. Here is the rocket on the way down:  | ||
| Anonymous |
Can you send me the plans in an e-mail? rvicars@agacademy.com | ||
| Anonymous |
I never made any plans. Just bring an empty pop bottle to the hardware store. The base is made of, i think, 3/4" steel pipes. This converts to whatever size the larger one is. I think that the PVC sleeve was 1 1/2". The rubber seals were some gromets that I found when I was looking for something to seal the bottle to the launcher. The plastic holders are held on by metal cinch thingies that you tighten with a screwdriver. to connect to the pump, I just got lucky. I converted to 1 1/2", i think, and then I found a pvc pipe end with threads so I could screw it on. I drilled a hole in the pvc end, and then stuck a replacement bike valve through(get the bike valve @ walmart or something). I also used a stake to help when launching. You connect a rope to the PVC sleeve, then through the stake that is in the ground right next to it. That way, it would pull the sleeve straight down. | ||
| Algae Elbaum (Chemy999) New member Username: Chemy999 Post Number: 1 Registered: 4-2009 |
right now i am in the middle of building a water rocket that, instead of having air pumped into it, will undergo electrolysis and then there will be a spark and it will blow into the air. my problem right now is that there will be A LOT of pressure inside the bottle so i am trying to think of a good way to build a stand that will keep the bottle upright but at the same time let it shoot up easily. my current solution is to have a stand with a hole in its bottom, made from the bottom of a bottle and three short wooden dowels. this will keep the bottle upright and to keep the water in i was thinking of having a bowl of water under the stand: the bottle will be partially filled with water, the cap will be screwed on, and once the bottle is inverted, in the stand, and the end is in the water i will unscrew the bottle. this should keep the water in in the bottle at the same level because of the air pressure. If anyone has any suggestions on how to improve on the design of the launching stand please email me at chemy999@gmail.com (Message edited by chemy999 on April 28, 2009) |
