How to Make A water bottle rocket with Pepsi, Mentos, A bottle, and A pump to make it go?

Question

It's just like A bottle rocket but no water!

Answer 1

I spent a weekend trying to get a Diet Coke bottle to launch itself using Mentos -- it never did work. The carbon dioxide just doesn't reach a high enough pressure to move the bottle of soda.

You COULD just follow the exact plans for a "Bottle Rocket" (there are many sites on thew web, I will add some links in a few minutes) but fill it with cola instead of water. If you added a way of stuffing some Mentos into the bottle before the water was added, and keeping the mentos from plugging up the exhaust at launch time, that might work -- but it requires pumping up just like a normal bottle rocket so there is not much point to using the soda and Mentos.

Here is a link to a very long answer I supplied to another person who asked about bottle rockets -- it helps understand what kind of things to do and not do to make the rocket fly better, and has links to good websites about building bottle rockets at the end:
http://answers.yahoo.com/question/index;_ylt=Auue5KQy1bgmIacU0Zn3gSAjzKIX?qid=20061115125131AAGGrRn

Answer 2

first off Pepsi has way less co2 then coke so go with coke (if you want to find out buy a can of each and wait 8 hours at a cooled temp the coke should still be fizzy enough to drink) second you will want a smaller 20 oz bottle less fuel but lighter a pump would add pressure but it would make the mentos rather unneeded and if you have the know how go to the local hardware store and buy some plumbing parts for the nozzle or drill a 3/8Th's hole in the cap and smaller and you probably end up with a cola squirt gun other then that the only thing you need is a good way to get the mentos in if you went to the hardware store you could grab some screen and a butterfly valve for the mentos (the screen to keep the nozzle from getting clogged) it should be something like bottle valve screen nozzle and the smaller the pieces the better less weight and you may need a little adapter but that should be ez just go in with a bottle and check all the good ones and grab some glue. but the only problem is that you may need on more valve or the pressure might release sooner then it can build so you may need to find a plug or another valve for right before the nozzle but in the end it will work the same and the water and pump just stickier, but at the same time its your money have fun.

Answer 3

if you just want to launch the empty bottle it is easier then when it is full.

Mentos will just make it spew.... the pump will work but you have to provide stabilizers or it just skewes off.

Best one I have seen is a lump of dry ice and a mortar block (the construction block with two large holes in it.

Set the block down on a smooth hard surface

put the dry ice into the soda bottle (empty of course)

add about a cup of warm water... don't bother to shake

cap it and set it upside down into one of the holes

move away rapidly.....

The pressure will build and eventually blow off the entire neck of the bottle launching the base skyward... it will tumble but it will launch.

No little kids on this - ok? its pretty safe but ..........

Answer 4

Someone told me about this recently, but i never tried it because i have 2 wait for the summer. here s cool program you can download(look lower)
http://www.seeds2lrn.com/rocketSoftware.html