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Jay, I only meant for the paint or other coating to be applied to the plastic pontoons. I wouldn't use the existing aluminum tubing, but replace them with SS tubing where they attach to the pontoons. If I used aluminum tubing for the attachment means then I would think Rhino coating it would be the best option for saltwater, if one wanted to coat it at all. But that is interesting data about the corrosion concentration in scratches. I don't know how much of that Vance or I will need to worry about, since both are subs might not be moored much, but be high and dry in a garage most the time. Regards, Szybowski From: bottomgun@mindspring.com To: personal_submersibles@psubs.org Subject: RE: [PSUBS-MAILIST] Hard Pontoon or Saddle Tank Options Date: Sun, 14 Dec 2008 09:10:59 -0500 Brent, Nice floats…something you would need to be concerned about with this method is the strength of the aluminum piping struts. While towing your sub with these floats on the surface, frictional drag and wave slap will impart high loadings on the pipes. The longer the struts, the greater the moment forces will be at the juncture at the mounting point on the sub’s hull.
Another issue to be concerned with is the painting of aluminum. You are often better off leaving aluminum uncoated. Due to its high sacrificial nature in the Galvanic series, all of the sacrificial corrosion will be focused at a scratch in the coating’s surface vice evenly distributed over the entire aluminum structure when uncoated (i.e. a deep pit/crevice vs. a thin surface corrosion). R/Jay
Respectfully, Jay K. Jeffries Andros Is., Bahamas
As scarce as the truth is, the supply has always been in excess of the demand. -Josh Billings
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent Hartwig
Vance, I came across my friends rotary molded hard plastic fishing pontoon boat, that I thought you might find of interest. These floats are can be mounted like saddle tanks or further out in a sponson configuration with enough room to perhaps see down between the main hull and the pontoons from the conning tower side viewport. These can easily be cut open on the bottom to make them into soft tanks, and add other things. These two models below, already have a integrated rod attachment means, that I would suspect might make them reasonably easy to attach to a sub with new SS rods. These floats can be sanded and painted or even perhaps Rhino coated. I much prefer the shape of the Float Cat 75's. They look like they might track well when the sub is being towed.
Specifications for Hobie Float Cat 75 complete assembly
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