Today I did launched some of my rockets. I was happy with yesterdays result as it flew in a bow. The only thing I had to improve was being able to let it fly straight instead of in a bow as if when it flies in a bow the parachute will not deploy. From yesterdays results I also learned that I will have to make the nosecones diameter smaller so it fits harder on the top of the coke bottle. This may sound odd but I think if the nose cone doesn't fit as well it will be more likely it falls in mid air, which makes the parachute more likely to deploy.
I brought a piece of paper and a note pad, a pencil, my 3 rockets, 6L of water, a hammer to peg the launcher in the ground, the launcher it self, my ipod which would measure the angle from a certain distance which would allow me to measure the height it travelled, a 20m wire, a watering can, a measuring cylinder, glue if something would need to be fixed, tape for same reason of glue, a stick for when it would land in a tree and my camera where I could film the rockets performance. Note all early models of rockets are from france bottles not english, english coke bottles have different shapes.
The test I did today were comparing some different diameters of nose cones and then seeing which one is the best for which bottle, in the sense that t falls of and let the parachute do its job. The two sizes i used were either 1.5L bottles or 2.0L bottle. Here are the results:
Test 1: Vertical take off, ballistic, landing 30 meters from land paunch pad. Used medium cone for a 1.5L bottle, pressurised a default pressure of 4.5 bar. All rockets will be filled with 0.5L.
Test 2: Ballistic, friction due to parachute wires sticking out from under nosecone which led to early deployment, however a perfect landing occured. This is a repetition of test 1.
Test 3: Use of smaller cone, vertical take off, ballistic, bottle 1.5L, pressure of 4.5 bar and 0.5L of water.
Test 4: Repetition of last test although this time with 6 bar however the nose cone was fixed from last night and wasn't able to hold 6 bar so we launched from 5 bar as we didn't want to break the nozzle. Ballistic and perfect parachute deployment.
Test 5: Use of 2L rocket with medium nose cone, again 4.5 bar. It had a beautiful deployment and it went fairly high, estimate of 50 meters.
Test 6: Repetition of last test, same results occurred.
Test 7: This time we decided to add more water and see what effect that would give. 4.5 bar and 0.75L. It didn't go as high so we decided 0.5L was better for this rocket.
Test 8: This time we added equal water as last test but increased pressure to 5 bar. It went fairly high but we got a slightly early separation of parachute.
Test 9: We used other 2L bottle but this time from England. This bottle was smoother. We pressured it to 4.5 bar and 0.5L and launched it with different nozzle as the cap is different. This was also ballistic and went up in the air, nice deployment of parachute occurred.
From these test we learned that the small cone can be used for the 1.5L and french 2L bottle and the medium cone for english one. We learned that adding wait in the cone also isn't necessary as that caused it to go in a bow while if you don't it goes straight up. Adding more water also didn't work as well and the results showed that 0.5L of water were perfect for these rockets. Lastly the test also showed that the parachute deployment now works perfectly.
I brought a piece of paper and a note pad, a pencil, my 3 rockets, 6L of water, a hammer to peg the launcher in the ground, the launcher it self, my ipod which would measure the angle from a certain distance which would allow me to measure the height it travelled, a 20m wire, a watering can, a measuring cylinder, glue if something would need to be fixed, tape for same reason of glue, a stick for when it would land in a tree and my camera where I could film the rockets performance. Note all early models of rockets are from france bottles not english, english coke bottles have different shapes.
The test I did today were comparing some different diameters of nose cones and then seeing which one is the best for which bottle, in the sense that t falls of and let the parachute do its job. The two sizes i used were either 1.5L bottles or 2.0L bottle. Here are the results:
Test 1: Vertical take off, ballistic, landing 30 meters from land paunch pad. Used medium cone for a 1.5L bottle, pressurised a default pressure of 4.5 bar. All rockets will be filled with 0.5L.
Test 2: Ballistic, friction due to parachute wires sticking out from under nosecone which led to early deployment, however a perfect landing occured. This is a repetition of test 1.
Test 3: Use of smaller cone, vertical take off, ballistic, bottle 1.5L, pressure of 4.5 bar and 0.5L of water.
Test 4: Repetition of last test although this time with 6 bar however the nose cone was fixed from last night and wasn't able to hold 6 bar so we launched from 5 bar as we didn't want to break the nozzle. Ballistic and perfect parachute deployment.
Test 5: Use of 2L rocket with medium nose cone, again 4.5 bar. It had a beautiful deployment and it went fairly high, estimate of 50 meters.
Test 6: Repetition of last test, same results occurred.
Test 7: This time we decided to add more water and see what effect that would give. 4.5 bar and 0.75L. It didn't go as high so we decided 0.5L was better for this rocket.
Test 8: This time we added equal water as last test but increased pressure to 5 bar. It went fairly high but we got a slightly early separation of parachute.
Test 9: We used other 2L bottle but this time from England. This bottle was smoother. We pressured it to 4.5 bar and 0.5L and launched it with different nozzle as the cap is different. This was also ballistic and went up in the air, nice deployment of parachute occurred.
From these test we learned that the small cone can be used for the 1.5L and french 2L bottle and the medium cone for english one. We learned that adding wait in the cone also isn't necessary as that caused it to go in a bow while if you don't it goes straight up. Adding more water also didn't work as well and the results showed that 0.5L of water were perfect for these rockets. Lastly the test also showed that the parachute deployment now works perfectly.
