Composite of Blackburn and General Aircraft’s second proposal for a transonic aircraft with variable-sweep wings, February 1949.

Blackburn and General Aircraft’s ‘Mk.3’ single Sapphire proposal to Specification E16/49, June 1950.

The ‘Mk.3’ transonic research aircraft with two stacked Sapphire engines, June 1950.

Blackburn and General Aircraft B.90. Forward view shows the aircraft with the wings in fully swept position.