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Joined: Nov 2012
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I saw this ad on ebay and I'm tempted: http://www.ebay.com/itm/Air-knife-c..._DefaultDomain_0&hash=item2ec338090aThose things are like $1200 a pop. To make it easy to dig up lines. I am not sure I want to add the price of compressor rental to estimates. It sure as hell would make digging hard ground easier. Anybody have experience with these?
Last edited by hendo; 11/07/12 11:00 PM.
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Joined: Jul 2004
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I suppose it really depends on what your usual soil is like.
Greg Fretwell
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Joined: Jan 2005
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Hendo, I never heard of such a thing.
Looks interesting, though. Sure, it's easy to spend someone else's money ... but I sure hope you get one, use it, and let the rest of us know!
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Joined: Jul 2004
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I am still trying to figure what you do with it. I can see some value for crossing a flagged area in the right of way to blow the dirt away from a buried utility but I don't see you digging much of a trench with it. Around here it would just be a sand storm generator.
One suggested use is troubling, "ground rod installation". Ground rods need to be driven, not buried.
Greg Fretwell
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Joined: Nov 2012
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locating lines: http://youtu.be/el6jMd53QS8among other things
Last edited by hendo; 11/08/12 08:51 PM.
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Joined: Feb 2003
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Only ones I have ever seen use an air knife are the public works guys for cleaning out the joint lines on concrete roads before they re-caulk them.
I may have also seen the hydro vac crews using them at some sites instead of a water jet.
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Joined: Mar 2004
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Around here it would just be a sand storm generator. I think you would eat a lot of dirt. I wonder how it would do in heavy, wet clay soil. The kind that sticks to your shovel and builds up on your boots until you can't walk.
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Joined: Jul 2004
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The one I was curious about was southern Maryland bank run gravel and clay. It is basically concrete with a little clay replacing the cement.
Greg Fretwell
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Joined: Oct 2004
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Looks like you could almost make your own. Mach 2 and no sonic boom? Hmm..
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Posts: 4,116
Joined: October 2000
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