[PSUBS-MAILIST] Fabricating foil sections

[hank pronk via Personal_Submersibles]

 Sean, Not sure about the size of foil your building.  I would weld up the frame then clamp one side on first and stich weld the inside of the plate to the ribs.  This would give the foil rigidity from the first plate.  Then clamp the opposite side plate with slots ground or cut that land partially on the ribs  so the plate does not deform when you bend it over.  Depending on the size of foil, do both sides need to be welded to the ribs?  Maybe one side is sufficient for rigidity and just the perimeter of the other side.  Wow thick is the foil?  can you clamp the second plate on with enough room to weld the mid span of the plate to the inside of the ribs?  The book "Steel Away"  is a great guide for steel boat building practices.Hank
    On Friday, May 29, 2020, 7:38:35 PM MDT, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Does anyone on the list have any experience with weld fabrication of foil appendages (e.g. NACA 00xx)? Specifically, I am looking at forming a 10 gauge steel skin around a framework of 0.250" rib frames (joined on beam / pipe spine). The ribs will be CNC cut from plate, but I am unfamiliar with the forming and welding steps. I know that ship rudders and the like typically employ slot welds of some sort to join skin to ribs, but I don’t know how this is actually done in practice. Any relevant knowledge would be appreciated. 

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