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Water Rocket Mortar

A place to ask general spud cannon related questions.
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Unread postAuthor: rna_duelers » Fri Mar 17, 2006 9:23 pm

I have made water rockets before with pop bottle and i just use a hole drilled in the cap with a small tomato plant stake to stabalize,just fill about 1/2 with water and use an aircompressor blower piece 2 air it up,and let go...sometimes they fly quite high and go a fair way.takes a little practice to get it working well and u get realy wet :P
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Unread postAuthor: Jakal444 » Sat Mar 18, 2006 6:59 am

I didnt manage to go buy any parts today ( St.Patricks day hangover) :?

But I like the idea of nails clamped together or maybe a nail that is wider at the top then the bottom, since you need a decent sized exhaust aperature.

Thats animation is very useful, it highlights the principle very well in case anyone did not understand yet. Thanks. Although it should not be fired at such a low angle, it is a mortar after all.

Rubber gloves are another good idea.

Soda sounds quite messy and sticky, but interesting. Maybe baking soda and vinegar instead? Or one of the many pints I had last night ? :)
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Unread postAuthor: taz22 » Sat Mar 18, 2006 10:55 am

i think you just must drink those pints :D don't let the air go drunk. i'v got 1 problem i dont have the right size of pvc at my home so i can't make it for now. maybe when i have money i wil make it:D as soon as it is finished i'll plant photo's maybe if i have a camera a video.
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Unread postAuthor: Jakal444 » Sat Mar 18, 2006 10:59 am

It seems that now we have a race to see who can launch their rocket first. Its like the X-Prize only smaller and with a very limited budget.
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Unread postAuthor: Orbit » Thu Mar 23, 2006 8:46 pm

Jakal444 wrote:What sort of pressure does foil burst at?

In my tests, 1 layer of foil bursts at about 10 psi.
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Unread postAuthor: Jakal444 » Fri Mar 24, 2006 4:11 am

So theoretically you would need at least 10 layers to reach 100 PSI. 10 layers seems like a challenge to fit onto one small endcap.
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Unread postAuthor: jrrdw » Fri Mar 24, 2006 6:29 am

I've read were members here cut tuper ware lids for burst disc. Bet it take quite a bid of presure to bust that.

I just used a old Gaterade bottle 20oz i think, drilled a little hole in the lid, filled half way with water, shoved my air blower nozzle in it, filled with air untill the bottle expanded a little, let it go, i bet it went 100' or a little better !

Thanks for that idea, my niece's will love it !
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Unread postAuthor: taz22 » Fri Mar 24, 2006 9:12 am

lol when do we start building it?? becaus my money is very very low :oops:
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Unread postAuthor: Atlantis » Mon Mar 27, 2006 6:00 pm

If you built a clip into this it could be a fullt automatic, gravity fed, mortar cannon. This gives me ideas for a burst-fire cannon I might make. I thought of the same concept but it pushes the bolt into the chamber releasing the gas.
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