Unarmoured carriers did not all share the same structure. Ark Royal lacked an armoured flight deck, but she still had a steel strength deck and steel flight-deck structure. She was more vulnerable than a British armoured carrier while remaining tougher in this respect than carriers built with wooden flight decks. The comparison keeps steel construction and armour as separate features when judging damage resistance.
Notable Point · 5:16-5:36
Ark Royal was unarmoured, not wooden-decked
A brief correction distinguishes Ark Royal's steel strength and flight deck from both an armoured carrier deck and the wooden flight decks used by other navies.