God i can't wait until winter, i just love hearing sleds in the distance with there pipes or cans, and i love to be one of the first riders out in the trail or ditch with freash powder and fluffy snow drift.
my dad built one a few years back. he just used some of his plumbing stuff to T a water hose and compressed air line together and then out through a nozzle from a pump sprayer. there was also a valve to adjust how much air there was in the mix so we could adjust for different conditions. we covered the entire yard (took a couple days), plus the neighbors cars and the hill where me and all the other kids would sled had about 2 feet on it once we spread out the huge pile it made. i think its still kickin around the basement somewhere, but heres some pics from the last time we used it.
if any of you guys do build one, you need something to keep the air hose from freezing. thats the biggest problem i had. either a heat wrap or something to take the water out of the system. oh, and something way bigger than a 12 gallon 5hp compressor. mine ran constantly for 3 days to cover the whole yard. im thinkin a custom built compressor using a 16hp briggs and maybe something to keep the air tank warm using the engine heat to keep the lines from freezing.
Did that a few years ago, here is a link to my posting from back then... http://www.snowmobilefanatics.com/forum/topic/58615/display.aspx It was a lot of fun to tinker with and it actually made a decent amount of snow. Snowguns.com is the online forum where I got all of my info, interesting forum to check out if your interested. Any questions on it just ask.
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