The new experimental IRB stationed at Lyme Regis, which is referred to on page 52, was built at Atlantic College in South Wales. The boat has a five-compartment 20-inch diameter special tube made by Messrs. Dunlop and is fabric strip glued to an independently constructed rigid floor. The rigid floor is made of f-inch marine ply Cascamite glued and brass screwed. Longitudinaj internal webs also of $-inch ply provide the main structural strength and divide the rigid floor into six separate water-tight compartments. The total buoyancy provided by the floor alone is around 1,500 Ib. and this gives the boat great carrying capacity. The main statistics are: Length—17 feet 6 inches, beam— 7 feet, draft (when the engine is lifted)—10 inches, weight—dry, less engine and loose fittings, 420 Ib., engine—Mercury 50 h.p., speed—30 knots, petrol capacity—12 gallons, range—upwards of 75 miles..