Guest,
I think that the Hamant boats are a good design, and all the ones I have seen run seem to get around real nice. They do well on the water, and seem to move along pretty easy on the dry. I've never operated, or ridden on one, but they look darn good to me.
I could be wrong, but I believe that the Alclad alloy offers superior corrosion protection over the standard 60 series offers. 60 series can also be welded, and is less expensive than alclad. That is why I believe alot of builders are using it to skin thier hulls. I think that the problems you have out there are due to the salt environment. Nothing you can do about that, and I don't see those boats living for 20+ years in the salt. Marshmaster talked aboat some serious anti-corrosion maintanence that he performs on his boats, and I bet thats what it takes to make them last for a decent life span out there.
As far as the deltahawks go, there is no way I'd dump 30k into a brand new airwothy crate engine for an airboat, but this engine appears that it might make it into production. If I had a plane to re-power, I think I would have to give it serious consideration. Piston aircraft engine tech has been stagnated for decades, and this is one of the few that are striving to break new ground with what I see as a viable new design. How many that would be built remains to be seen, as they are in for a long up-hill struggle, but I hope they make it.
They also indicate that they have plans for an industrial version of that power plant. This version would probably be dramaticaly cheaper than a certified engine for many justifiable reasons, but would still offer the same performance of the airworthy units.
All I am saying that I like thier concept, and I would like to see this design make it, and perhaps trickle down to airboat applications like gas burning aircraft engine have already done.
That would probably take quite some time, so I'm not holding my breath.
I do think that this engine could be a better powerplant for an airboat than the current gas burning aircraft engines, for the same reasons that a plane owner might want one.