O.S. Engine

FR7-420 4-Stroke Engine


osmg1307

 

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

SPECIFICATIONS
Stock Number: OSMG1307
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)
37010 FR7-420 Sirius Parts Listing

Click here to see 2-view drawing.

See a 360 view

parts inset

inset 1

V-shaped valve layout matches various scale model airplanes.

inset 4

Optional Collector Ring collects exhaust from each cylinder and vents it through two tubes.

inset 2

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.

inset 3

The impeller distributes balanced air-fuel mixture to each cylinder, which has realized long lasting stable idling.



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