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Building a dredge

Posted by Bill Rose on March 28, 2012 at 12:42am in Questions and other things

I am going to build a small 1 1/2" dredge. I have a 4ft sluice with a roughly 2ft head box already. What I am wondering is would 6" pvc pipe work for the pontoons or should i use 8". I have a 3.5 Briggs running a keene 1 1/2 output pump (2" intake). And also how long do you think the pontoons should be?

Thanks

Bill

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Replies

  • mtau March 28, 2012 at 2:06am

    Bill: I have an old Keen 1 1/2" dredge that sets on a 20" truck tire innertube. You could figure out the cf. of air in the tube when it's inflated (appox. 10"dia.), and figure the weight of the tube (appox 10lbs.) Figure that against the weight of your pvc. Or you could go with 5ft.x8in. pvc. It's better to have to much flotation than not enough. 

    • Bill Rose > mtau March 28, 2012 at 2:11am

      Thats what i was thinking. 5' of 8" would work and even allow me to adjust the angle of the box if i needed to.

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