It probably won't work, longbows have a slightly longer string than a recurve at the same respected bow lengths (58" for example). The longbow string would be around 55", and the recurve around 54" for starters. The problem is if you unwind the string to fit the longbow, you may take out to many twists if it's a flemish string causing it to come apart. Conversely, if you try and twist the string too much to fit a bow, it can produce negative effects such as loss of speed, damaging of the string, and overall bow performance and quietness ususally goes out the window. Just my observations anyway.