Version featured in this [age is the RC engine equipped with a primitive but effective throttle and mufti-positional muffler
Designed and Manufactured in England by the Progress Aero Works, of Macclesfield.
Front induction; radial porting; simple effective carburetor; radial exhaust ports and exhaust collector ring with variable exhaust muffler positions
Specifications:-Displacement: 2.47 cc
Bore 15.16 mm
Stroke: 13.67 mm
This model airplane engine was all gummed up and virtually frozen from years of storage after use. After an hour or so of softening the old oil and turning by hand she is shown here all freed up and anxious to run again.