I bought my yacht - which was raced offshore in its younger years - with a no3 battened jib, years ago.
When l sold it recently it was still in the same sail bag it came in, stored at home .
I used it once and it proved - with a twin foil on my fore-stay - the most cumbersome, useless piece of equipment l ever had. It had to be man handled every time bent or dropped, it interfered with the cutter stay and it was a pain for a single handed sailor.
Probably on a crewed racer it would have been useful. The furler proved to be a better option or the cutter sail in higher winds.
I wonder, why an Endeavour 26 got a sail like this?
It must have been raced in the past, probably offshore like my boat was?