Try Hydrocomp software at hydrocompinc.com we have been using there propcad, and propexpert sofware for some time and it has been a great help in designing and manufactiring props.
I would suggest adhesive bonding as used widely in the Aerospace industry for bonding 2024. however both 6061-T6, and 3105-H12 are readily weldable I would suggest a 5356 filler rod due to the 42,000 psi tensile strenth 6061. The drawback to welding is the fact that both parts are already heat...
3m 969 adhesive transfer tape, comes in various widths and thicknesses can be used with hand dispenser gun, it's used widely in the automotive and aerospace markets for trim application, we use it bond PVC to lexan, plexiglass, and aluminum with no primers.
I agree with mantis, try the extra low carbon filler, also in addition to maintaining seperation of your materials we also keep all SS rods in a seperate electrode oven, and clean them with Stainless steel wool and acetone prior to use and have not had any corrosion problems even in harsh...
My main concern is of the boats electrical systems, boats with onboard generators have two independent electrical systems, an AC system and a DC system these systems are desinged independent of one another in theory only, the major problems are grounding issues, the ground shoes depending on...