FR7-420 4-Stroke Engine
The brightest star in 4-stroke appearance and performance!
The "Golden Era" looks of the FR7-420 Sirius are matched by its superb power output and rich, realistic sound.
- The vintage 7-cylinder design is a scale airplane modeler's dream
- Individual V-shaped valve covers add to the scale appearance, and make this engine compatible with several airplane styles
- Main internal parts such as the crankshaft, cam holder and reduction gear are all plated to resist corrosion
- Air-fuel mixture is distributed equally to each cylinder to ensure stable, long-lasting idle
Displacement: 0.6071 cu in x 7 (9.95 cc x 7)
Bore: 0.944 in (24.0 mm)
Stroke: 0.866 in (22.0 mm)
Practical rpm: 1,500-7,000
Weight: 111.7 oz (3.167 g)
Includes: 7 type F glow plugs, valve adjusting kit, radial mount & hardware kit, needle valve extension cable, glow plug cable set and aluminum case
Recommended Props: 22x10-12, 23x8-12, 24x8-12, 26x8
V-shaped valve layout matches various scale model airplanes.
Optional Collector Ring collects exhaust from each cylinder and vents it through two tubes.![inset 2](http://www.osengines.com/engines-airplane/osmg1307/osmg1307-inset-2.jpg)
Main internal parts such as crankshaft, wrist pin, cam holder and reduction gear are all plated for anti-corrosion.
Selected material and proper thermal treatment ensure high durability of the parts.
The impeller distributes balanced air-fuel mixture to each cylinder, which has realized long lasting stable idling.