os engines FR7-420 SIRIUS 7 CYLINDER RADIAL

The O.S. Engines® Sirius 4-stroke engine is ready and waiting to give vintage 7-cylinder design to any scale airplane modeler's dream. The "Golden Era" looks of the FR7-420 Sirius are matched by its superb power output and rich, realistic sound. The V-shaped valve layout makes this engine compatible with several airplane styles. The main internal parts like the crankshaft, cam holder and reduction gear are all plated to resist corrosion while the air-fuel mix is distributed equally to each cylinder to ensure a stable, long-lasting idle.

FEATURES:

Main internal parts such as the crankshaft, cam holder and reduction gear are all plated to resist corrosion
V-shaped individual valve covers for vintage scale appearance
Impeller system distributes air-fuel mixture equally to each cylinder ensuring high performance and smooth idle.
Padded and lockable aluminum silver colored storage case.


INCLUDES:

O.S. Sirius7 FR7-420 7-Cylinder Sirius 4-Stroke Engine, seven type F glow plugs, valve adjusting kit, radial mount & hardware kit, needle valve extension cable, drain plug, carburetor insert, decal, glow plug cable set, instruction manual and aluminum case.


REQUIRES:

Fuel: Aircraft blend 5-10% nitro content with 8-10% lubricant content (it is suggested to dilute commercially available 15%
nitromethane and 18% lubricant fuel with methanol half and half to make a 7.5% nitro and 9% lubricant fuel)

RECOMENDED PROPELLERS: 22x10-12, 23x8-12, 24x8-12, 26x8


SPECIFICATIONS:

•Displacement: 0.6071cu in x 7 (9.95cc x 7)
•Bore: 0.944" (24.0mm)
•Stroke: 0.866" (22.0mm)
•Practical RPM: 1,500 - 7,000
•Weight: 111.7 oz (3,167g)
•Crankshaft Size: UNF3/8-24
•Distance from Backplate to Drive Washer: 6.2" (158.5mm)
•Outer Edge of Backplate to Pushrod Covers: 4.8" (122mm)
•Outer Diameter: 9" (230mm)
Carburetor Settings:

Needle valve, 2-1/2 turns open from closed position
Throttle Valve, approximately 1/4 turn open from closed position,
then start engine and follow break-in instructions on pages 19-25 in the instruction manual.