Was HMS Unicorn really only an auxiliary? — Patreon 36: Repair Ships, Depot Ships, Tenders and Stores… at 1:42:57

Was HMS Unicorn really only an auxiliary?

Unicorn possessed a flight deck, catapult, radar, armor, anti-aircraft guns, and room for operational aircraft, yet the Royal Navy classified her as an auxiliary to fit treaty limits and her intended carrier-support role.

Question

What did HMS Unicorn lack compared with a proper fleet carrier?

Short answer

She was slower and optimized for support, but she retained many carrier capabilities; her auxiliary classification depended more on intended role and treaty law than on appearance.

Notes

Unicorn's 24-knot speed and nominal capacity of about thirty-three assembled aircraft limited her beside a fleet carrier. Her flight deck, catapult, radar, armor, and anti-aircraft battery still gave her substantial carrier capabilities. The legal argument rested on purpose: she was procured to repair, supply, and reinforce carriers in the way a tender supported a flotilla. Calling her a forward aviation support ship allowed the Royal Navy to present her as an auxiliary despite a design that could operate aircraft directly.