I have a customer who would like me to sew some curtains for their portholes (7x14) rectangles in a Mainship. They want simple rod pocket panels on either side of window but how the heck will the curtains close if the porthole is open? It opens from the bottom to the top. I'll be happy to create something else for them if anyone has any ideas as to how to have closed curtains with an open porthole...
I assume the curtain will have a rod at the top and will be a two piece separaing curtain. If anything close to that mount the curtain on a removable rod, lift it up to close or open the port hole.
I had a trawler and the hull had fuzzy hulliner and the portholes velcroed on open the porthole swing open and velcro the cover ba k on but why if you want air?
Or maybe snaps would work?
I think their best bet is to remove the rod also. Then just put it back on when the window is open. Hopefully enough room behind the window for the rod.. Will talk with customer.
Spacing between the rod and window can be an easy problem; two options come to mind, rod brackets can be adjustable outward from wall. If not just band saw or sabre saw some wood brackets to the distance you need.
That is the most easy way, when one wants to open or close, just lift rod out of bracket, close or open and merely drop it back in place. I suspect the window projection won't become an issue anyway, no reason to have a real thick window frame in the construction of that.
Good luck, I think you are swinging!