The Pegasus flew for the first time in 1935 and gained its British Gliding Association certificate of airworthiness no. BGA 232. Early test flights with the improved undercarriage were made in July and August at Maiden Newton, home of the Dorset Gliding Club. It flew in the annual BGA competition held at Sutton Bank in late August 1935 as no.20. Until the outbreak of war Penrose often flew the Pegasus from Kimmeridge, on the Dorset coast, at weekends. The Pegasus survived World War II and afterwards underwent modifications, never completed, to enlarge the cockpit. This, the only example built, was later burnt.