I have posted this before, ill search for it, but it can be done with a pump or air compressor. Very easy to do.
Quote:
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Originally Posted by Mercury Rising
Fill it 3/5 with water put it on a home made PVC launcher with rubber rings, hook it to an air compressor, wait until you can hold no more and let go. WOOSH! Altitude 200-500 feet. If you don't have an air compressor you can use a bike pump... Altitude 100-150 feet. With correct pumping timing & water amount.
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Notice: I didn't put out much information on the launcher but it isn't that difficult to figure out.