A prior posting was all about boats with emphasis on low cost and DIY Do It Yourself boats, especially those than can be stowed in small spaces (like my car or truck).
As that page is now way high “page weight” from lots of videos, I’m starting this page for a bit more discussion without all that waiting to load things you’ve already seen.
Here’s the first segment:
Expandacraft has a product that does most of what I’d want to do. I’m just not keen on spending $1600 to get it. So I’d been pondering my own build. Then I stumbled on this demonstration of reconfiguring one of their boats into 3 different builds.
My big takeaway from it is simple: I had a 27 foot motor sailor that could be taken on the ocean. It has colored my sense of “needed strength” too much for a boat that will be run on a fishing lake in calm weather for fishing. Either that, or their craft is not going to be very sturdy. Given the number shown in various videos, I think they probably have “enough strength”; which then means I could lighten my design point considerably.
So, with that, their assembly is very simple and the strength of elements is not extreme. Simple PVC tubes, near as I can tell, from watching the video, make the “spars” of the deck support. What looks like thin aluminum plank makes the deck. Pontoon sections join with what looks like a ‘blow moulded plastic dovetail’.
Given the apparent low need for stiffness and strength in a low speed catamaran, the whole build becomes easier.
Now this video has a novel way of joining boat sections for a 2 piece dingy. A large dovetail is built between the two sections and a turn lock at the top prevents them from sliding back out. That has real potential for a pontoon in sections also.
So I’m thinking that DIY pontoon sections made of “stitch & glue” thin plywood, some with foam cores for persistent buoyancy, then with dovetail locking joints to join them, and a more modest spar structure to support a very light weight decking based off of two center pontoon sections ought to be light, easy to store and transport, and still be effective.