A rough model of how to mount a tilting frame for the solar panel.
Optimum angles vary according to time of year, but generally speaking you get more power if you tilt the panel toward the south at an angle of between 40 and 60 degrees to the horizontal. About 48 degrees is a good average.
I haven't thought it all through yet but this rough paper model shows how a simple arrangement would work. The beauty of this idea is that it allows the frame to be tilted to the right or to the left according to which way the boat is facing. Of course if the boat is facing north south it won't help at all, except perhaps to face the early morning or late evening sun in summer.
The little hinged legs will be made out of aluminium strip from Wickes, simply rivetted at the joints like this.
This seems to make a nice stiff hinge (sorry for the blur, probably my hands trembling with excitement!).
What I have yet to work out is how exactly to attach the base frame to the vertical screws rising from the roof magnets (see earlier post). If the base fame were aluminium angle strip that might work. The problem might be stopping the rivets from catching on the side of the frame as the frame is raised.
My engineering pals (hint hint) may have elegant ideas.