David, we use duckbills or manta rays exclusively here in the sandy loam soils of Leelanau County because of high failure rate With helicals in sand. I like the ductile 11" manta ray for apples and the 6" inch aluminum or ductile for rocky soil in grapes. Whenever we have a helical fail in an old vineyard a duckbill is used to replace it. Hope this helps.
Kevin J. VerSnyder VerSnyder Orchards Lake Leelanau, MI 49653 > On Mar 30, 2017, at 4:30 PM, David Kollas <kol...@frontier.com> wrote: > > Does anyone have experience with duckbill-type earth anchors for row-ends > in trellis orchard or vineyard? > > Compacted glacial till is a common feature below about 18-20 inches here. > I am looking for anchoring against > possibly as much as 2000 pounds force. Can aluminum duckbills be driven into > glacial till? Does galvanized cable > rust out after a few years? Other important observations? I didn’t > mention that the soils here are abundantly > supplied with a wide range of stone sizes and types. > > David Kollas > Kollas Orchard > Tolland, CT > > > _______________________________________________ > apple-crop mailing list > email@example.com > http://virtualorchard.com/mailman/listinfo/apple-crop _______________________________________________ apple-crop mailing list firstname.lastname@example.org http://virtualorchard.com/mailman/listinfo/apple-crop