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#207583 - 11/07/12 07:00 PM Should I buy an Air Knife?
hendo Offline
New Member
Registered: 11/07/12
Posts: 2
Loc: new york
I saw this ad on ebay and I'm tempted:

http://www.ebay.com/itm/Air-knife-compre...=item2ec338090a

Those 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?


Edited by hendo (11/07/12 07:00 PM)
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#207585 - 11/07/12 10:08 PM Re: Should I buy an Air Knife? [Re: hendo]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
I suppose it really depends on what your usual soil is like.
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#207589 - 11/08/12 08:33 AM Re: Should I buy an Air Knife? [Re: hendo]
renosteinke Offline
Cat Servant
Member
Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
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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#207590 - 11/08/12 09:11 AM Re: Should I buy an Air Knife? [Re: hendo]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
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.
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Greg Fretwell
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#207592 - 11/08/12 04:51 PM Re: Should I buy an Air Knife? [Re: hendo]
hendo Offline
New Member
Registered: 11/07/12
Posts: 2
Loc: new york
locating lines:

http://youtu.be/el6jMd53QS8

among other things


Edited by hendo (11/08/12 04:51 PM)
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#207593 - 11/08/12 06:25 PM Re: Should I buy an Air Knife? [Re: hendo]
mbhydro Offline
Member
Registered: 02/21/03
Posts: 344
Loc: Winnipeg MB Canada
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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#207597 - 11/08/12 10:25 PM Re: Should I buy an Air Knife? [Re: gfretwell]
twh Offline
Member
Registered: 03/11/04
Posts: 899
Loc: Regina, Sask.
Originally Posted By gfretwell
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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#207598 - 11/08/12 11:03 PM Re: Should I buy an Air Knife? [Re: hendo]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9066
Loc: Estero,Fl,usa
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.
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Greg Fretwell
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#207616 - 11/10/12 05:46 PM Re: Should I buy an Air Knife? [Re: gfretwell]
trollog Offline
Member
Registered: 10/02/04
Posts: 273
Loc: San Diego California USA
Looks like you could almost make your own. Mach 2 and no sonic boom? Hmm..
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