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  • OS FS56a II OS FS56a II
  • Four Stroke Engine FS56 Four Stroke Engine FS56
  • OS Engine box OS Engine box

OS FSa-56II Four Stroke Engine

Quick Overview

Four Stroke Engine for 40Size Plane FSa-56II


OS Engine FSa II

Top quality from OS. This is a four stroke engine. Upgrade your 40 Size plane with this realstick sound and power. Excellent for scale pilots to enjoy the deep realistic sound for your ultimate flying experience.

Engine Available on Tower Hobbies for $400


REQUIREMENTS for this Engine


Recommend Fuel: 10% to 20% nitromethane with 18% lubricant. Synthetic, castor, or a synthetic/castor lubricant blend may be used.

Recommended Propeller: 

Sport & Aerobatic, 13x6, 12x6, 12x7, 12x8
Scale, 13x6, 13x7, 12x6, 12x7, 12x8



Displacement: 0.569 cu in (9.32cc)
Bore: 0.945" (24mm)
Stroke: 0.811" (20.6mm)
Engine Weight: 13.9oz (394g)
Output: 1.0 ps/0.99 hp @ 10,000 rpm
Practical RPM: 2,400 - 13,000

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