16 4.5" AA guns (8x2)
32 2pdr AA (4x8)
60 aircraft 

HMS Ark Royal was the first large aircraft carrier to be laid down as such for the Royal Navy. There was a high continuous flight deck 56ft above the deep load waterline with an unusually long stern overhang, and an island and funnel to starboard. The flight deck was an integral part of the hull structure, serving as the upper strength deck, and had an usable area of 720ft x 95 ft. It was provided with two catapults that could launch 12.000lb at 66kts. There were two hangars measuring 568ft upper, 452ft lower x 60ft x 16ft, and three rectangular lifts, two measuring 45ft x 22ft and one 45ft x 25ft. These each had two platforms, of which the upper one travelled between the flight deck and the upper hangar and the lower one between the two hangars. This meant that it took three movements to transport aircraft from the flight deck to the lower hangar. Petrol stowage was 100.000gal. The belt was taken to the lower hangar deck abreast the funnel, to the upper deck fore and aft of this and to the lower deck by the forward and aft 4.5in magazines; there was a 3½in armour deck at the various levels of the upper edge and over the steering gear. There was a sandwich type underwater protection with a 1½in protective bulkhead 13ft 4½in from the side amidships. The system was designed to withstand a 750lb charge but trials while Ark Royal was building showed that the bulkhead stiffeners had to be modified. There were three boilers and three engine rooms, and it should be noted that the tactical diameter was undesirably large at 1010yds. The 4.5in guns were in open-backed mountings and apart from blast effects could fire across the flight deck. Two more 8-barreled pompom mountings were added in May 1941.