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Combustion Water Bottle Rockets

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Unread postAuthor: mark.f » Wed Apr 20, 2011 7:26 am

jackssmirkingrevenge wrote:Just after firing, are you shaking your hand dry or did it hurt you?


Dry. Did the sloopy arm appearance give you the impression of a fracture? :wink:

Zeus wrote:I've been playing around with a few crude combustions (ignition circuit testing) and I'm rather suprised with the power.


What I have been trying to tell many people since I first started. :roll:
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 20, 2011 8:26 am

mark.f wrote:Dry. Did the sloopy arm appearance give you the impression of a fracture? :wink:


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Unread postAuthor: Insomniac » Wed Apr 20, 2011 6:51 pm

Haha did anyone else think that in the .GIF it looks like he's turning on a lightsaber?
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I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

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Unread postAuthor: Lockednloaded » Wed Apr 20, 2011 9:01 pm

On average, how high/how far do they go?
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Unread postAuthor: mark.f » Wed Apr 20, 2011 10:15 pm

There's no telling. I suppose I could rig up an "angle finder", but then I'd need to rig up a way to remote launch it.
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Unread postAuthor: Lockednloaded » Wed Apr 20, 2011 10:27 pm

just a rough estimate, or distance would be fine
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Unread postAuthor: mark.f » Wed Apr 20, 2011 10:34 pm

Well, distance is out, as firing horizontal allows gases to escape without forcing the water through the nozzle.

As far as a WAG for height, I would say maybe 50 feet. Hangtimes really aren't that reliable because of how the bottle flies, but in the video, you can hear the bottle land towards the end.

EDIT: about a 4 second hang time with just a plain bottle. However, my revised rocket shows promise. :wink:
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Unread postAuthor: Secret Squirrel » Fri Apr 22, 2011 5:12 pm

I just tried this out. It took less than an hour to put together from junk in the garage. Cheap, quick and fun. The bottles don't go particularly high, but who really cares? It's practically free.
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Unread postAuthor: jimmy101 » Fri Apr 22, 2011 5:30 pm

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Unread postAuthor: mark.f » Fri Apr 22, 2011 5:57 pm

Ah, and we see again nothing is new is the world of... well, everything. :D

He should be getting much better height using hydrogen and oxygen over just propylene or propane in air. However, I don't have the nerve to be launching such mixtures by hand.
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Unread postAuthor: warhead052 » Fri Apr 22, 2011 7:35 pm

mark.f wrote:What I mean is that, if I were to place the "bulb" at the neck of the 20 oz. bottle to where the spark gap was at the very top of the rocket, if I switched to a 2L bottle, the spark would be lower. I'd also like to see if there's any difference between a centrally located spark and a spark at either extreme end of the "combustion chamber".


Then you simply use a coupler, and a couple alligator clips and wires, and have a extended rod. No big deal, it works excellent for me, with air pressure atleast...
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Unread postAuthor: mark.f » Fri Apr 22, 2011 7:44 pm

warhead052 wrote:Then you simply use a coupler, and a couple alligator clips and wires, and have a extended rod. No big deal, it works excellent for me, with air pressure atleast...


First off, that effectively blows my budget of approximately $0.00 & 0/0 USD. :P As I said before, it doesn't leak any detectable amount, and with the bottle in the inverted "firing" position, even minuscule leaks are leaking water, not the ever important fuel mixture.

In other news, I left a rocket "charged" (filled with the correct amount of water, fueled up with the torch, and then capped off) for a full 24 hours, shook it up, uncapped and mounted it on the launcher, and fired it off, no problems. Thinking of making an ammo belt. :lol:
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Unread postAuthor: warhead052 » Fri Apr 22, 2011 7:56 pm

Ok, well, its worth a shot when you wanna spend cash on it! Believe me, it works, and its a fun airsoft rocket launcher too...
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Unread postAuthor: mark.f » Fri Apr 22, 2011 8:07 pm

Trust me, when I have cash to spend, I'm not wasting it on bottle rockets.

(I'm going to waste it on gas, insurance, school, first...)
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Unread postAuthor: mark.f » Sat Jul 06, 2013 7:58 pm

So... horizontal launches...

I tried this off the page Jim linked earlier in the thread, but obviously modified slightly to work with combustion. All I did was run a pair of wires around the balloon. Inconsistent fueling and popping balloons are plaguing me.

So, does anybody know a simple, safe gel that could be used for the same thing? I tried using cornstarch and the microwave, but got lumpy gels that don't really stay together.
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