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  #31   Spotlight this post!  
Unread 22-06-2006, 16:16
KenWittlief KenWittlief is offline
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

something that would pop out at the right pressure, like a cork or rubber stopper?

or fire to melt the cap off?
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Unread 22-06-2006, 17:04
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

Maybe an axe or a hatchet to cut the top off. Hopefully one can get it going fast enough so the bottle doesn't take off early with the top still hanging on.

Just make sure your fingers are out of the way, first.
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Unread 22-06-2006, 21:44
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Graham Donaldson Graham Donaldson is offline
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

Quote:
Originally Posted by Astronouth7303
Maybe an axe or a hatchet to cut the top off. Hopefully one can get it going fast enough so the bottle doesn't take off early with the top still hanging on.

Just make sure your fingers are out of the way, first.
Yeah, but I'd rather not use anything more dangerous than high pressure in a plastic container. (Especially not on my own property- ). The picture in my mind is two rocket launching pads (see below, attached) next to each other with two pieces of plywood. One has a nail in it, the other has a hole with a rope. Bungee cords are attached to the top of the bottle, which is set on the pads with straws to guide it. Pulling the string & therefore pulling the board, the bottle is pulled onto the nail, bungee cords release, bottle goes flying. I've attached a crude sketch for you all to look at. After looking at it, you can all say "You suck at drawing and your handwriting looks like chicken scratch!", because I've admitted it.

However, a cork might work. My only worry is that it would pop out too early, after I've shaken it, but before I've got it on the pad, and that would make a mess. Maybe taping the cork in and pulling it out with string, but I dunno. Suggestions accepted on this idea as well.

That's all for now, folks!

The Canuck
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Last edited by Graham Donaldson : 15-03-2007 at 07:51.
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Unread 25-06-2006, 17:30
JamesBrown JamesBrown is offline
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

well this is going into my plans for rocketry this summer (I Am in charge of model rocketry at a summer camp) In the mornings we will be doing traditional Estes model rockets, and in the after noons we do what ever I happen to come up with (IE water/air pressure rockets, Baking soda/Vinegar rockets, giant water balloon catapults, basically what ever I want to do.

For this one, I like the idea of a rubber stopper, that is what we use (slightly modified) for the water rockets. The only problem is it may shoot out before you can get it set up to launch. The method we use for launch is gluing straws onto the bottle and putting two wire coat hangers into a piece of ply wood separated the same distance apart as the straws on the bottle and slide the straws onto the hangers. this gives you a (slightly) controlled launch, this is what I would recommend, if any one has any other questions (or ideas) for me feel free to let me know.
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Unread 25-06-2006, 19:00
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

Here's an idea on how to launch the rockets on command:

1. Remove coke bottle cap.

2. Drill a small hole through both sides of the area with the threads.

3. Drop in mentos.

4. Quickly place a cork in the nozzle/neck, and hold it there.

5. Find a nail with a flat head, and tie some string around it just below the head.

6. Carefully stick the nail through the holes in the bottle and the cork, like this:

It will act as a pin and prevent the cork from popping out.

7. Shake bottle.

8. Place rocket on some sort of sturdy thing to use as a launchpad (I'm planning to use one of those cinder blocks with the holes in it).

9. Pull on the string to pull out the nail. The cork will be pushed out by the pressure in the bottle, and the rocket should launch!

WARNING: This idea is untested, and there is a chance that there will be a problem when the nail is halfway out.

BTW, Coke and Mentos are on sale at our local store!
Next month, we shoot for the moon!
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Unread 25-06-2006, 23:35
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

hahaha thats awosmee
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Unread 25-06-2006, 23:37
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

http://community.livejournal.com/ohn...t/7349072.html

Apparently Diet Coke and Mentos made the Approval Matrix...on the Brilliant side.
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Unread 25-06-2006, 23:48
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

I think the best solution to this has to be simple. All you really need is to find the perfect diamater hole to maximize the thrust of the built-up pressure. Of all the "tests" we did, the best results (e.g. farthest distance) occur when the cap of the bottle would be blown off, leaving the roughly one inch diamater opening as the thrust nozzle.

So to ensure the perfect launch, you will need to find a way to make the cap the weakest part of the bottle, so that it fails first. But at the same time it has to be strong enough to withstand the "normal" pressure of the built-up Diet Coke/Mentos reaction.

And as we also found, the body of the bottle itself will rupture sometimes before the cap would blow off. From these results you can conclude that if we had ever screwed on the cap of the bottle too tightly, then the bottle itself would break. But if the cap was not on very tightly - yet still on enough to keep the pressure contained - the bottle would blast off like a rocket.

So here's the challenge: to find a way to launch the bottle on a controllable launch angle, using this "cap tightness" observation.
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Unread 25-06-2006, 23:53
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

Quote:
Originally Posted by artdutra04
So here's the challenge: to find a way to launch the bottle on a controllable launch angle, using this "cap tightness" observation.
Already being designed. Due to come to fruition on July 1st.
Stay tuned.
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Unread 26-06-2006, 00:33
Ted Boucher Ted Boucher is offline
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

Tonight I got bored and decided to think about all the designs I have made up since Samm's grad party. Only one of them stood out as the easiest and safest way to do this.

My design uses the "Pop Top" spout from a Poland Springs water bottle to replace the normal cap for the diet coke. I made this work easily with about 2 minutes of work with a dremel tool. This will hopefully create the most likely weak point in the bottle and exert all of the created pressure out of it. As used at the party, I will use plastic wrap to store the mentos until the bottle is shook. The pop top has a clicked in position to keep the cap closed. This will hopefully pop open when there is to much pressure in the bottle. If this does not work, then it could also be manually opened. The spout restricts the opening from a .841 inch opening to a .298 inch opening, and should give it much more power.

I will be testing this design out tomorrow, and will repost my results.
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Last edited by Ted Boucher : 26-06-2006 at 00:47.
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Unread 26-06-2006, 01:39
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

Hmmm...




Would it just blow up, or fly if launched correctly? Let's find out.
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Unread 26-06-2006, 01:42
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

Quote:
Originally Posted by Elgin Clock
Hmmm...




Would it just blow up, or fly if launched correctly? Let's find out.
COKE GRENADE!!
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Unread 26-06-2006, 01:45
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

Quote:
Originally Posted by Dylan
COKE GRENADE!!
Nope.. no grenades here officer.. Just my beverage and some candy.
<shifty eyes>


And, on a related note, a chat I just had with Ted from my team:

Me: lol well.. they are based outside the US (Mentos)
Me: lol
Ted: ahhhh
Ted: it makes sense now
Me: Parfetti Van Melle - Holland
Me: made for Parfetti Van Melle USA Inc. Erlanger, KY
Ted: someone was prolly trying to secretly sneak explosives into the country with mentos
Me: LMAO
Ted: and it has finally come out
Me: AHAHAHAHAHAHAHA
Me: should I notify homeland security?
Me:
Ted: yes
Ted: and tell them that you think the declaration of independence has a secret map on the back that leads them to the factory
Me: LMAO
Me: Like National Treasure, but this is the greatest modern engineering treasure ever!!! maybe.. maybe not.. LOL
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Last edited by Elgin Clock : 26-06-2006 at 01:59.
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Unread 26-06-2006, 01:48
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

^ lol, I am so spotlighting that!
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Unread 26-06-2006, 10:48
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Re: One upping Dave: A Diet Coke and Mentos Rocket!

Quote:
Originally Posted by Dylan
COKE GRENADE!!
#1: AWESOMENESS!!!! Where do you get those lol?

Quote:
Originally Posted by Dylan
Here's an idea on how to launch the rockets on command:

1. Remove coke bottle cap.

2. Drill a small hole through both sides of the area with the threads.

3. Drop in mentos.

4. Quickly place a cork in the nozzle/neck, and hold it there.

5. Find a nail with a flat head, and tie some string around it just below the head.

6. Carefully stick the nail through the holes in the bottle and the cork, like this:

It will act as a pin and prevent the cork from popping out.

7. Shake bottle.

8. Place rocket on some sort of sturdy thing to use as a launchpad (I'm planning to use one of those cinder blocks with the holes in it).

9. Pull on the string to pull out the nail. The cork will be pushed out by the pressure in the bottle, and the rocket should launch!

WARNING: This idea is untested, and there is a chance that there will be a problem when the nail is halfway out.

BTW, Coke and Mentos are on sale at our local store!
Next month, we shoot for the moon!
#2: Awesome idea, that could really work!

And finally, #3: Will somebody PLEASE tell me HOW THE HECK YOU PUT A PICTURE IN A POST WITHOUT CREATING A NEW THREAD?!?!?!?!?!?! It annoys me to no end that I can't do that without making it an attachment. Dylan, you know how to do it- PM me with how, PLEASE!!!!!!

Enough...now time to do serious work (*cough* games *cough*)

The Canuck
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