O.S. Sirius7 FR7-420 7-Cylinder Engine

O.S.^® Sirius7 FR7-420 7-Cylinder Engine

Features

The V-shaped valve layout matches various scale model airplanes.

Main internal parts such as the crankshaft, cam holder and reduction gear are all plated for corrosion resistance. Select, high-quality materials and proper thermal treatment ensure durability.

The inner propeller distributes balanced air-fuel mixture to each cylinder, resulting in stable idling.

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! Its vintage, 7-cylinder design is an airplane pilot’s dream, while individual V-shaped valve covers add to the engine’s superior scale appearance.

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 high performance and superb idle.

Specifications

Displacement: 0.60 cu in x 7 (9.95 cc x 7)
Bore: 0.94 in (24 mm)
Stroke: 0.87 in (22 mm)
Practical RPM: 1,500-7,000

Weight: 111.7 oz (3.167 kg)
Requirements 5-10% blend nitro airplane fuel with 8-10% lubricant content
22x10-12, 23x8-12, 24x8-12 or 26x8 propeller