Amelia Earhart with Pratt and Whitney R1340-S3H1 engine and Hamilton Standard propeller Published on May 30, 2013 in Amelia Earhart’s Lockheed Electra 10E Special, NR16020Full resolution (894 × 1205) ← Previous Next → Amelia Earhart poses with her Electra’s Pratt & Whitney Wasp S3H radial engine and two-bladed Hamilton Standard variable-pitch, constant-speed propeller.