Supermarine Spitfire Dimensions: Span: 31.9’ Length: 31’ Engine: Rolls Royce Merlin 61 1720 hp in-line Weights: Empty: 5,800 lbs. Loaded: 7,500 lbs. Performance: Max Speed: 405 MPH Range: 430 miles Armament: Two 20mm cannons Four 3.03” machine guns OR Two 20mm cannons Two 0.5” machine guns