We had the opportunity to fly our rocket at the last NSWRA's Mullaley HPR launch. Here is a video of a couple of those flights: OTArDzG2veg We're working on a follow up video that has a closer look at the data from these flights and how it compares to simulations. We're now going start focusing on b...

That tube turned out really nice joeman, well done! The epoxy to resin ratio is great. If you are adding epoxy to the outside I would recommend mixing it with microballoons before applying, that way you get a lighter weight finish and easier to sand as well. Though you would need to paint it a solid...

When good water rockets turn bad, they are turned to the dark side:

Thanks for posting the update. Yup the deploy was sure eventful, that is one heck of a zipper. I've wondered if a few wraps of carbon fiber tow around the top of the tube would help with zippers. It was good to see the printed retainer work well. What are your plans for repairing the rocket?

Here is a video of the rebuild of the sustainer that will hopefully fix the bending problem we saw with the previous one. At the end of the video is an accidental pressure test that points to the upper pressure limit for these airframes. :D XoY2JqwTqTE We are hoping to launch this next week at the M...

That turned out really well! Can't wait to see it fly. What brand of clear coat are you using?

Looking Great Derek! I will be very interested to see how those retainers hold up, but like you said, you can always print a new one. It may be harder to unscrew if it deforms somewhat?

I agree, Krusty does a great job. He's done several decals for us.

How long do you think the winding will take for a 2m tube? Also what is the pot life of the epoxy you are using? Do you mix it as you go and add more, or can you make the whole tube with the one batch of epoxy you mix up at the start? (Sorry if you already answered some of the questions earlier in t...

That's looking really good joeman! What is the wall thickness?

Whoa, that's a lot of water. I hadn't seen that video before. Is that coming from the water tower?

Thanks Derek, We've measured the air temperature above the water level in a previous test, the air bubbling up through the cold water had virtually no effect on cooling the air above the water as that is where it is compressed. The air being released from the scuba tank actually drops in temperature...

During the launch at Thunda 2 we had a bit of an unusual failure with the sustainer. It bent quite severely during pressurisation. sG-YXnAGYdU Here is an explanation video of what we think happened: I7i8ELEF3ro We have almost finished the rebuild now, just need to do a hydro pressure test tonight an...

Hi Simon, If you are looking to try water rockets, I would recommend building yourself a "Clark cable-tie launcher". A few pieces of PVC tubing, some cable ties and a hose clamp or two. Very easy to build, and there are many tutorials on line. As an air supply all you need is a bicycle pum...

Yes same here. I couldn't post in some other threads as well.