Q&A: why Renown and Repulse began from the Revenge design

Why were Renown and Repulse developed from the Revenge class instead of enlarging and up-armouring Tiger?

The Revenge-class basis used newer framing and protection ideas, while the conversion produced a longer, faster three-turret ship rather than an enlarged Tiger.

Renown and Repulse began from Revenge-class hull concepts that reflected newer armour and framing practice than Tiger. Converting that basis meant removing a turret, lengthening the hull, redistributing protection, and providing much more machinery. A larger Tiger with extra armour would still carry an older structural approach. The battlecruisers emerged as a distinct redesign of the R-class basis, with different proportions and machinery from Tiger.