OS Max Sirius FR5-300 5 Cylinder 4-Stroke Rotary Radial Engine Vintage! Still in the box unused
OS Engines created something special to commemorate their 50th anniversary; a beautiful engineering marvel, the FR5-300 radial. Machined mostly from bar-stock materials (including the highly polished crankcase & the black anodised cylinders), this FR5 features a geared double-track cam ring to operate its OHVs (over head valves), actuated by push-rods & a machined master connecting rod with articulated rods assembly, ringed aluminium pistons & ball raced crankshaft (4 ball bearings & 2 needle roller bearings). Its equipped with an impressive cast mount, which surrounds the automatic mixture control RC carb, whilst providing easy access to the RC carb controls.
Unlike other production radial engines that use crankcase to distribute fuel mixture from the RC carb to the cylinders, this FR5 has separate inlet manifolds, just like the full size radial engines, resulting in consistent smooth running of all 5 cylinders. Ideal engine for use in a large scale model, e.g. 1/4 scale bi-plane, war-bird or just for display.
Tech Specs (from OS) Displacement: 9.95cc x5 (0.607cu.in x5) Bore: 24.0mm(0.945 in.) Stroke: 22.0mm(0.866 in.) Practical RPM range: 1,800 - 8,500 Weight: 2,670g (94.3oz) Glow plugs: Type F Typical prop speeds (RPM) Zinger maple props: 18x12" - 7,000 18x14" - 6,600 20x10" - 6,800 22x8" - 6,700 Condition wise, this FR5 radial is unused & comes with box, packaging, full compliment of accessories & tools, including glow plug harness, display stand & comprehensive instructions. International bidders are welcome! Shipping worldwide with tracking number. Shipping cost to be calculated The OS Max FR5-300 5-cylinder radial; perfect for the flyer & the collector!