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If you build it so you have enough clearence under the sled,I am guess almost 80 %reduction..The one I built a couple years ago has 7 1/2 clearence..And with all my gearit pulls easy..But I am getting an eskimo wide and I am anxious to see how it pulls with thatsitting on it..But ten again I don't have more than a couple 100 yards to go...the thing is to build the sled as light as you can..
I just built one out of 2x lumber, 2x8's for the risers and 2x4's for the cross members. I got 75-80% reduction in drag. I drilled the ski tips and installed eye bolts with the eye down for the rope. The reason I put them eye down was when you pull on them it will lift up on the skis as opposed to installing them the other way which when pulled pushes down on the tips. Just my .02
the nice thing is it is easy to attach a set of old lawn mower wheels for those long pulls across parking lots and boat ramps.
Where does everyone recommend attaching the pull rope? I drilled holes in the tip of the skies. Should I attach there or run my rope through there and attach to the front of the first set of risers?
I like the idea but how do you keep them from dragging in deep snow?