Whiplash Sport40 Kit is cut from a CNC router with exact precision. All skin is 1/16'' 3-ply birch aircraft grade plywood, the frames are 1/8'' 3 ply birch plywood. You can buy the kit without a cowl, or with a fiberglass cowl. Fiberglass cowls are vac bagged for strength and weight. A 10 page instruction manual as well as a CAD layout are also included Specs: Hull Length: 36'' Hull Width: 18'' Sponson to Sponson: 10-1/2'' Stance: 13-1/8'' RTR weight: 7.5 lbs Recommended Hardware: Speedmaster .45 size rudder Speedmaster .45 size flat bottom strut Speedmaster UMM universal motor mount Recommended Props: Octura X450/2 Octura X450/3 ABC 1814/2