O.S. Engines

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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 75AX Engine

The New power source for .60 sized aircraft
* Fits the same mount and bolt pattern as the 61FX.
* The angular head design looks great and significantly increases surface area for better cooling.
* Includes the new Power Box� muffler, designed with more volume for increased power while still being very compact.
* A diagonally-placed needle means no remote needle valve is needed.
1.94HP
19.4oz

os 95AX engine

The 95AX is another popular-sized engine in the AX series that's famous for providing uncompromising power in tight-fitting applications. The power of a 95 in the same size bolt pattern as the 75AX.

A high-performance engine that's ideal for aerobats and large-scale models.
Generous thread on the extra-long, balanced crankshaft means more secure prop attachment
Balanced cracnkshaft provides smoother running which is important on the larger single-cylinder engines as vibrations can literally shake apart the airframe.
The E-4040 Power Box� muffler that's included dampens noise while boosting power.
2.86HP
20.0 oz