LanceMakes

There are no written instructions, just the video, the no-glue variation, and the Tips and Troubleshooting section. The empty step is a bug that I'm trying to resolve with the Instructables team.

It looks like the wheels are in stock again: https://amzn.to/2KMqcL3

Hello,The straws need to be about 1/4" in diameter. You can use larger straws and just tape the straws to the craft sticks so they don't slip out. You might be able to use toothpicks, but they could break easily, depending on how thick your straw is. Good luck!

So glad to hear that! Hearing comments like this is exactly why I created these plans for free :)

Yes, you can use plastic bottle caps or wheels or whatever else might work. I prefer buying the plastic ones because they don't require prep, and they're consistent.

Thanks! Ali Phelps did all of the illustrations - she's incredible. Check out her art on AliPhelps.com. The project cost more than I would've liked, mostly because of the 10 rolls of duct tape and the cross-shaped PVC connectors. I don't know how much exactly, but definitely over $100.I have no idea how to kayak, and I didn't flip over! So it's somewhat stable, but I'm not able to evaluate that very well.

Hi - I'm happy to offer my advice. Regarding teams, I suggest having a limit of 2-4 students per team. It gets tricky for 5+ people to be engaged at once. For teams of 3, 30-feet of insulation and 60 minutes is a good place to start. For teams of 2, do 20 feet of insulation. To keep costs and prep down, I just tell kids to use the walls and the furniture around the room to support the coasters. Things like boxes, cups, etc are lightweight and can get shifted around easily, so they're not ideal for supports.

It's not a separate piece, it's part of the pre-assembled propeller. There's a link for the propeller on the materials page.

I typically use about 60-70 PSI. A shorter launch tube may help a little bit.It looks like your compression chamber is pretty large, which can make it challenging to build up sufficient pressure.You can also try wiring up two 9V batteries to the launch button, which will help release the valve at higher pressures.The way the rockets are made is also just as important to the distance traveled. Use card stock (not copy paper), and emphasize attaching at least 3 fins that are equally spaced and as straight as possible. Very small imperfections in the rockets can cause significant reductions in performance.

Whoa, that's quite an improvement! I hope this inspires other makers to take this rocket launcher design idea to the next level!

That does indeed look super fun - thanks for sharing!

Excellent! Glad you're making good use of the project plans :)

Yes! 1/2" PVC pipe fits perfected through the neck of most standard plastic bottles.

Feel free to post pictures and/or share what went wrong. Happy to help if I can.

The video contains the instructions :)

Thanks for alerting me. I'm also having this issue. I've created a bug report in the forums, and will hopefully have this resolved soon.

The syringes I use are 12ml, and filled to 10ml.

30 on each side.

Amazing! Thanks for sharing :)

Awesome! Thanks for sharing!

Hi - thanks for your feedback. At this time, I'm not selling projects or taking commissions. If you want something easy to build for your son, search for Cork Shooter on Instructables.