O.S. Engines

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OS .40LA

The standard in sport engine technology, in a unique streamlined design More cooling fin area extends the life of the engine, and virtually eliminates engine seizures in the air Added "webbing" on the crankcase strengthens high-stress areas to help ensure that they stand up to the rigors of learning to fly Overall tighter needle valve fit utilizes an "O" ring to help maintain the performance levels you need A fuel inlet that points up allows for easier fuel line access for fueling and defueling.
1.0 HP
9.5oz (with muffler)

OS .46 LA

The standard in sport engine technology, in a unique streamlined design.
More cooling fin area extends the life of the engine, and virtually eliminates engine seizures in the air.
Added "webbing" on the crankcase strengthens high-stress areas to help ensure that they stand up to the rigors of learning to fly.
Overall tighter needle valve fit utilizes an "O" ring to help maintain the performance levels you need.
A fuel inlet that points up allows for easier fuel line access for fueling and defueling.
1.2HP
9.6oz

OS .46AX

As the replacement for the high-performance .46 FX, it's no wonder that the .46 AX shares many of its features. The raw power. A remote needle valve. Mounting bolt patterns. A balanced "D"-cut crankshaft supported by dual bearings. CNC-machining for the piston and other parts. And the same exclusive ABL cylinder liner that has made FX reliability a byword. But all the same, the .46 AX is a different — and better — engine. Why? Because times change and technology advances. And because O.S. uses the best of both to make a good engine a better engine.

* Features the .46 FX's durable ABL (Advanced Bimetallic Liner) plating, as well as a new design that automatically centers, levels and seats the head during re-replacement. Head snugs down with only four screws — not six.

* Subtly tapered low-end needle eliminates surging at transition, ensuring exceptionally smooth, consistent throttle control from idle to top speed.

* Redesigned liner ports and a ball-milled inlet port minimize turbulence during fuel/air mixing, making combustion and power output more predictable.

* New high-speed needle bracket simplifies horizontal/vertical mounting — and can be replaced in just minutes.

* Minimizes vibration-induced "creep" and re-sets with a ratchet spring on the high-speed needle and O-ring seals on both needles. A simple rotor guide screw replaces the throttle stop screw — and eliminates spring-related movement.

* Includes a new low-noise E-3010 muffler and 2-year warranty protection.

* Includes a lock nut and longer crankshaft with more thread length, for better prop nut engagement and greater pilot safety.
1.65HP
17.2oz(with muffler)

OS .61FX

All OS FX engines come with remote needle valve - the feature most asked for!
A longer crankshaft provides more secure attachment for spinner, prop and nut
Dual ball bearing construction adds durability and longevity
Semi-square head shape creates more fin area to increase cooling capacity
Each engine comes with a high-performance carburetor and muffler with adjustable exhaust direction and built-in pressure tap.
1.9HP
19.4oz

OS .70II Surpass

OS developed the Surpass Series of 4-stroke engines for discerning fliers who demand more power. Able to swing larger props and supply more usable horsepower, Surpass 4-strokes provide the best performance for your plane, regardless of scale or flying style.
All Surpass engines feature a helix gear-driven camshaft on the front end and dependable updraft carburetor in the back.
All include glow plug and standard silencer.
1.1HP
20.30oz

OS .91 II Surpass