Saturday's Launch

[DogLover]

Hello!!
I got about 5 good launches this past Saturday. Since I don't have a altimeter, I wrote down the amount of water used and the pressure on a piece of paper and ran a simulation once I got home. Here is the data I got.

Launch # PSI H2O (litres) Altitude (feet)
1 90 1.3 258.1
2 100 1.3 305.3
3 120 1.3 401.5
4 125 1.3 425.8
5 125 1.3 425.8

I plan on posting pictures ASAP.

-DogLover

[U.S. Water Rockets1]

Hello!!
I got about 5 good launches this past Saturday. Since I don't have a altimeter, I wrote down the amount of water used and the pressure on a piece of paper and ran a simulation once I got home. Here is the data I got.

Launch # PSI H2O (litres) Altitude (feet)
1 90 1.3 258.1
2 100 1.3 305.3
3 120 1.3 401.5
4 125 1.3 425.8
5 125 1.3 425.8

I plan on posting pictures ASAP.
-DogLover

What brand of beverage are you using for your bottles? We were talking to a local scoutmaster, and he was saying they were having a lot of bottles failing recently at 120PSI. He insisted that they were making bottles less durable. We have weighed some different size bottles and it looks like the never ones are 10 grams less in weight. It seems like they are lighter due to a more consistent wall thickness at the bottom of the bottle. That really thick part of the bottle at the center of the base is much thinner than the older bottles.

At a guess, we estimate that the preforms are made with a varying wall thickness to save plastic in the areas where the bottles are not expanded so much. That would account for the thinner walls at the base, and could mean less pressure in an unmodified bottle.

[Spartan117]

I know that plastic bottles that hold alcoholic drinks are rated for more pressure. You should look at plastic beer bottles.

[DogLover]

I am using Pepsi brand as well as Publix bottles. I am not sure what brand the 1-L I have are, but I hope that they are not bad. I have noticed that when ever the bottles have been stored out side for a while, they seem to get weaker from the sun. I have never seen a plastic alcohol drink containers. Interesting.

-DogLover

[Spartan117]

I am using Pepsi brand as well as Publix bottles. I am not sure what brand the 1-L I have are, but I hope that they are not bad. I have noticed that when ever the bottles have been stored out side for a while, they seem to get weaker from the sun. I have never seen a plastic alcohol drink containers. Interesting.

-DogLover

They sell beer and wine coolers in them at sports games and concert events. You see, plastic bottles don't do as much damage when people throw them at other people. I never saw them in the store. LOL.

They look like regular glass bottles only they are thicker. You have to smuggle them out in your bag because they want you to turn them in so they can recycle them. I treat them like the glasses you get at a IMAX movie. I paid $30 to see the film, so I will keep the glasses, thank you very much! I never collected enough of them to make a rocket.