O.S. Engines FR7-420 Sirius-7 7-Cylinder 37010
This is the O.S. Sirius7 FR7-420 7-Cylinder 4-Stroke Engine.
Features
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O.S. Engines FR7-420 Sirius-7 7-Cylinder 37010
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Main internal parts such as
the crankshaft, cam holder and reduction gear are all plated to resist
corrosion
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V-shaped individual valve
covers for vintage scale appearance
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Impeller system distributes
air-fuel mixture equally to each cylinder ensuring high performance and
smooth idle
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Padded and lockable aluminum
silver colored storage case
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Two year limited warranty
through Hobby Services beginning at date of purchase
Specifications
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Displacement: 0.6071cu in x 7
(9.95cc x 7)
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Bore: 0.944" (24.0mm)
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Stroke: 0.866" (22.0mm)
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Practical RPM: 1,500 - 7,000
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Weight: 111.7 oz (3,167g)
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Crankshaft Size: UNF3/8-24
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Distance from Backplate to
Drive Washer: 6.2" (158.5mm)
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Outer Edge of Backplate to
Pushrod Covers: 4.8" (122mm)
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Outer Diameter: 9" (230mm)
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Carburetor Settings:
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Needle valve, 2-1/2 turns open
from closed position
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Throttle Valve, approximately
1/4 turn open from closed position, then start engine and follow break-in
instructions on pages 19-25 in manual
Package Contents
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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
Requirements
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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)
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Propeller: 22x10-12, 23x8-12,
24x8-12, 26x8
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