Folland Fo.108
The Folland Fo.108, also known as the Folland 43/37 and by the nickname Folland Frightful (or Frightener), was a large monoplane engine testbed aircraft of the 1940s. == Design and development == The Fo.108 was Folland's response to Air Ministry Specification 43/37 for a single-engined engine testbed, with accommodation for a pilot and two observers.