OS FR5-300 Sirius Engine

The OS Sirius (FR5-300) is a five-cylinder radial overhead-valve four-stroke engine of 49.75cc (3.04cu.in) total displacement. The FR5-300 has been designed to meet the requirements of those whose interests lie in the field of very large radio-controlled aircrafts. This engine suits modellers who demand the high standards of refinement that are not available in large displacement two-stroke engines based on chainsaw and other light commercial power units.