Today we flew a water rocket with a deployable camera boom so that we could film a rocket in flight from close proximity. This is an extension of an experiment we flew a few years ago.
I love these "back to the roots" experiments. Your experiments with skittles in microgravity, toilet paper drop, camera boom, camera in parachute... once showed me, what is possible with water rockets and made me build my first own water rocket. Greetings from Germany
I think Friday should be experimental day at Mullaley. I know there are loads of ideas that people are sitting on that they would like to do. Great idea!!
Brilliant set-up and awesome video footage from the rocket. I used pop bottles many years ago to build a water rocket. For the launch mechanism I used cable ties connected to a slip ring on a wooden base and the hole bits of the cable ties were clipped onto the bottles neck, the part that forms a ring around the cap area. This held the bottles open part against a rubber seal. We had a string attached to the slip ring and that was the release mechanism. Was a bit temperamental to keep the bottles in place but it did work. We used a hand pump but only put 60 to 70 PSI in the bottle. You guys have obviously taken it to another level with your rockets. Amazing piece of work and ingenuity. Cheers from Scotland mate. 👍👍👍
Thats awesome. I spent "lock down" building a bottle rocket launcher! I have had so much inspiration from your videos! Every kid loves it and every adult that wasn't paying attention before they say "wait, what...did he just launch that coke bottle that high". Version 2 is in the works! Thank you so much for the help and advise u have un intentionally given me and the entertainment u have help me give to not only my kids but also adults who think bottle rockets are silly, until they see mine, and I only do either 2l or 2x spliced 2l bottles. Bunch of big kids us eh?
That's great! Glad to hear you are having fun with water rockets too. :) Eventually we all stop using kids as an excuse to go out and launch water rockets. :)
Could you lengthen the boom back to its previous size but move the elastic release servo nearer to the top of the rocket so there is less stress on the boom during the ascent?
Have you considered using a small 360 camera. There are some pretty small ones these days and you would see the whole rocket with a short boom. Also could you use a light capacitor instead of the nine volt battery. Might save some weight although I’m not sure what you are powering with it so maybe it wouldn’t be suitable.
We've seen some amazing footage from those 360 degree cameras that people have flown on rockets. We've looked at a couple but they are quite expensive, and flying them on rocket (as you saw) is risky. But it would be cool to put one out on a boom, and then erase the boom so it looks like the camera is just floating there. We use the 9V batteries for convenience when flying casual rockets. They are easy to mount, easy to connect and have a voltage above 6V. In higher performance rockets we use smaller LiPo batteries to save on weight.
I think a Blackfin 720 VR camera might work and be cheap enough to be reasonably expendible
2 года назад
It's a little off-topic, but how much pressure did you put in the rocket for this test ? 2:19 "shampoo to help reduce the top speed" Do you mean reduce the acceleration, not the speed ? So with the shampoo it reduces the intensity of acceleration, but the rocket accelerates over a longer time and at the end the rocket goes higher. Is this correct ?
These were pressurised to 120psi, (8.3bar). The foam reduces the average thrust to about 2/3 of what it is with water alone but gives you almost double the burn time. So it reduces peak acceleration, and the top speed. Similar to reducing the nozzle size.
@@AirCommandRockets I would like to see if you put the water with some detergent in a food blender and totally foam it up before putting it in the rocket. You get some very stable and very small bubbled foam this way. My gues is you get a very long intermediate fase between waterfase and airfase.
@@bartpijpers3844 The problem is as soon as you start pressurising those, the bubbles collapse and you end up with mostly liquid again. We tried this with shaving cream that has millions of tiny bubbles and on compression you ended up with just liquid that mostly stayed a liquid after decompressing again. Ideally you want high pressure tiny bubbles that are created after the rocket is pressurised. We developed a technique called "Jet Foaming" that creates these high pressure bubbles in flight. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wIwJxc8PnnA.html
hello mr. katz, i have a question for you, you always fill the rocket with pressurised regular air, what would happen if you filled it with a gas which is heavier than air or lighter than air? i would love to see a demonstration of this, thank you, excellent video btw
It's amazing your coke bottle rockets perform so well. How many bottles were actually pressured? How do you make compressed air? You never mentioned pressurizing the rocket. Was that a soap reaction? Mentos and Coke? A CO2 cartridge? What's the cheapest rocket you could build that would make it to 62 miles up and back?
We use a scuba tank to pressurise the rockets. Pretty much the full length of the rocket was pressurised. The bottles are spliced together base to base, and then we screw the necks together. No chemical reactions are involved, just compressed air pushing on water. We add a little shampoo that stretches out the thrust to give a little more performance. Unfortunately no amount of money will allow you to build a water rocket that can go 62 miles. A few km at most.
We use these ones. www.coolthings.com.au/vortex-valve-tornado-tube.html We enlarge the hole and also use a couple of rubber washers on the inside rather than o-rings.
@@AirCommandRockets great then. Also keep in mind that it can be done in 3D. they are probably a bit heavier than fiberglass (depending on the thickness of the wall, and obviously hollow). But they are not flexible and that is good, since the wind would not bend them and it would not slow the rocket. Or so i think
Yup it is possible. Here is a video on our old channel where we tried that. The video is about 11 years old now. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-CHHqk9nOvHo.html
@@IgotQuestions. Yup a water rocket can only go a handful of km at most. For a rocket to 150km you are looking at tens of thousands of dollars as a minimum.
