i came up with this idea after my dad told me to leave my real bottlerockets alone and i got bored. so... vuala!

Step 1: tools

1 bike needle
1 bike pump
infinite plastic bottles
that's all!!!
water cannot be presurized
You don't fill it with water, just add between 1/4 and 1/3 of the bottle's capacity.<br> <br> If you wanna know why it works, become a physicist or <a href="http://en.wikipedia.org/wiki/Water_rocket" rel="nofollow">read this wiki.</a>
That's an <a rel="nofollow" href="http://www.amazon.com/Inflating-Needles-100-each-PAC/dp/B000VQGZKC/ref=sr_1_3?ie=UTF8&s=sporting-goods&qid=1214432234&sr=8-3">inflating needle</a> for sports balls, not a &quot;bike needle&quot;. I don't know how you could use one on a bike.... :-)<br/>
I suppose that you could use it to let the air out of the tires... it's about the right size to depress that little pin.
That would make it an anti-bike needle! (LOL)
ty dacker... i feel dumb now,lol.
I'm sorry, but where is the hydro<em><strong> &quot;electric&quot;<em> <strong>aspect of this rocket</strong></em></strong></em><br/>
yeah thats what i thought of when i saw it!
This is known in my household as the 'John Noakes Rocket' - Blue Peter, circa 1970. It's one of those 'toys' which has stood the test of time. Try it with a washing-up liquid bottle (with the small nozzle) with around two inches of water inside. (Sticky back plastic is optional #;¬)

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