Fore and aft sails on a large sail trainer - fore and aft because they run fore and aft - I guess. The alternative are the square sails that run abeam.
70x300 lens 1/750sec on f1.0 at 100 iso - handheld (well there is no point in trying to use a tripod at sea!!).
I have cut this fairly harshly to allow the headsail foot to run from the bottom rhs.
Not much post processing - pushed clarification and single sharpen a touch of colour saturation.
Thanks you for looking.