A Photo & Discussion Forum for Wharram Design Enthusiasts
I'm wondering if anyone has experience with embedded mooring systems, and/or knows how to weld bronze to iron, or bronze to stainless steel, if that is possible.
I would like to make a helical type screw to embed in soft sand, and am thinking of fixing some old propellers onto a shaft in order to create a segmented archimedes screw which will then be wound down into the substrate.
Old parts inventory...a 100 kilo engine block, some rebar, a few old propellers, some chain, some discarded anchors of various types. A pile of mixed metals. I suppose I could scrounge a stainless shaft.
I want the old propellers affixed to the rod/shaft which is fixed to the block. I'm thinking that the block would reduce wiggle in the shaft, while the shaft would prevent the block from dragging. The chains would go from the block to the anchors, as backup.
Sorry to ramble. I guess the question is: What is the best way to affix bronze propellers to a shaft of a dissimilar metal?
Thanks in advance for your ideas. And, Cheers!
Well I found one made of stainless, but it looked kind of like some kid had made it in his high school welding class. Didn't have the helix right and the welds weren't worth...anyway, it was a waste of time on somebody's part.
I did find a company that seems to make them properly at http://www.helicalanchorsinc.com/ but that's a lot of weight to be sending overland.
Sam, thanks for the idea of checking with the local power company. They are used locally to anchor the posts that the electrical lines are run on.
David, please excuse my poor memory for names, and thanks for enlightening me as to JMT. Yes launch was fun, great to be in the water :) Still have a lot of work to do though.
Meanwhile, I'm going to go find a couple more small engine blocks. Hate to be getting a bigger hammer when I could just use my brain and others to create a more elegant solution, but unfortunately I lack the welding skills. Definitely a project for later though :)
The simple system we use here is old tyres with a galvanized steel hoop, filled with concrete, Ideal for sandy bottoms, simple, cheap and secure. The size of the tyre denotes the size of the boat you want to secure. For a Pahi 63 you'd be looking a an old large tractor tyre at the very least.
Thanks for all the good ideas. I'll be sure to post some pics of whatever system we cobble together :)
http://en.wikipedia.org/wiki/Screwpiles more information
i hope this could help