Tim Royle's plan is available at http://www.myhobbystore.co.uk/produc...pwith-triplane also a copy of the article is available at extra cost

The Tripehound is nothing like a Sopwith but is a 56 inch sport version of the Fokker triplane by David Boddington and avail as a plan and wing ribs etc from DB Sport & Scale in England http://www.dbsportandscale.com/Tripehound.htm