Thakns for the reply, to view my particular Katana use this link
http://www.ytinternational.co.uk/yt_...b_site_033.htm , the wing has a tapered leading edge and the measurements are: Wing Half 27.5" (698mm), Leading Edge to Rear 17" (430mm) Wing tip leading edge to rear 9 5/8" (245mm), hope that helps.
Kev.