It's a washable marker with the back end removed and the felt taken out. I taped the cap to seal it, loaded the alka seltzer in the back end and put the cap back on the back end. It takes pliers to get that cap off so you can imagine the pressure release is a lot better. The model rocket altimeter we borrowed said the finished rocket made 70-100 feet. I'm not sure I believe that but it blows away a film canister.
kool
kilk200 4 years ago
It's a washable marker with the back end removed and the felt taken out. I taped the cap to seal it, loaded the alka seltzer in the back end and put the cap back on the back end. It takes pliers to get that cap off so you can imagine the pressure release is a lot better. The model rocket altimeter we borrowed said the finished rocket made 70-100 feet. I'm not sure I believe that but it blows away a film canister.
furrballsaps 4 years ago
Loved the clip - what was the container? Seemed a lot better than film canisters.
bevgeek2 4 years ago
that was pretty sweet
canezfan222 4 years ago
how did u make that
viralpatel2010 5 years ago