.46 AX

If you liked the .46 FX... you're gonna love the .46 AX!

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 linear 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 factory warranty protections.
• Includes a lock nut and longer crankshaft with more thread length, for better prop nut engagement and greater pilot safety.

Part No. OS MG0547 Displacement: 0.455 cu in (7.5 cc) Bore: 0.866 in (22.0mm) Stroke: 0.772 in (19.6mm) RPM: 2,000-17,000 Output: 1.65 hp @ 16,000 rpm Weight: 17.2 oz (489g) Recommended Props: 10.5x6, 11x6-8, 12x6-7 Muffler: yes CART  ADD  Price $124.99* Prices with * Include Ground Freight (48 states).

Top of page

.55 AX

More muscle for .40 sized airplanes.

Increase displacement in your 40-size model the easy way: just drop in a .55 AX engine. You'll enjoy more horsepower for swinging bigger props - which means improved 3D, precision and sport flying. Best of all, there's no modification required.

• Mounts directly into the bolt pattern for a .46 AX
• A diagonally placed needle eliminates the need for a remote needle valve. The 5-sided, angular head design looks great and significantly increases surface area for better cooling.
• The PowerBox muffler has a generous sized chamber and larger sound baffle to significantly reduce exhaust noise without stealing power.
• ABL (Advanced Bimetallic Liner) uses two O.S.-developed alloys to provide a durable barrier between the brass liner and piston.

Part No. OS MG0556 Displacement: 0.545 cu in (9cc) Bore: .91 in (23 mm) Stroke: 0.85 in (21.5mm) Weight: 14.3 oz (404 g) Includes: #8 glow plug, 40J carburetor, E-3010 muffler Recommended Props: 11x6, 11x7, 12x6, 12x7, 13x6 Muffler: yes CART  ADD  Price $154.99* Prices with * Include Ground Freight (48 states).

Top of page

.61 FX

Part No. OS MG0561 Displacement: 0.607 Bore: 0.945 Stroke: 0.866 RPM: 2,000-17,000 Output: 1.90@16,000 Weight: 19.4 Recommended Props: 11x8-10, 12x7-11, 12.5x6-7 Muffler: yes CART  ADD  Price $179.99* Prices with * Include Ground Freight (48 states).

Top of page

MAX .75 AX

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.

Part No. OS MG0575 Displacement: 0.75 Bore: 1.02 Stroke: 0.93 RPM: 2,000-16,000 Output: 2.40@15,000 Weight: 19.4 Recommended Props: 14x6, 14x8, 15x7 Muffler: yes CART  ADD  Price $209.99* Prices with * Include Ground Freight (48 states).

Top of page

.91 FX Ring

Part No. OS MG0591 Displacement: 0.912 cu in (15.0cc) Bore: 1.091 in (27.7mm) Stroke: 0.976 in (24.8mm) RPM: 2,000-16,000 Output: 2.8 hp @15,000 rpm Weight: 19.3 oz (550g) Recommended Props: 13x8-9 Muffler: yes CART  ADD  Price $229.99* Prices with * Include Ground Freight (48 states).

Top of page

1.20 AX w/ Muffler

Ideal for 3D, Precision and Sport flying. Mounts in same space as the .91FX. "Power Box" Muffler with extension and 90 degree adapters, O.S. #8 spark plug supplied with engine. Two-year factory limited warranty.

Part No. OS MG0650 Displacement: 1.218 cu in (19.96 cc) Practical RPM: 1,800-9,500 Power Output: 3.1ps/ 9000 rpm Weight of engine: 22.82oz without muffler, extension or adaptor Weight of muffler: 7.074oz with 90 deg adapter installed Weight of muffler: 7.907oz with extension installed Crankshaft thread size: 5/16-24 Muffler: yes CART  ADD  Price $259.99* Prices with * Include Ground Freight (48 states).

Top of page

1.20 AX

Part No. OS MG0651 Displacement: 1.218 cu in (19.96cc) Bore: 1.197" (30.4mm) Stroke: 1.083" (27.5mm) Practical RPM: 1,800-9,500 Power Output: 3.1ps/ 9000 rpm Weight: 22.82oz Crankshaft Thread Size: 5/16-24 Muffler: no CART  ADD  Price $239.99* Prices with * Include Ground Freight (48 states).

Top of page

1.60 FX Ring

Part No. OS MG0661 Displacement: 1.60 cu in (26.2cc) Bore: 1.32 in (33.6mm) Stroke: 1.17 in (29.6mm) RPM: 1,800-10,000 Output: 3.7 hp @ 9,000 rpm Weight: 32.6 oz (925g) Recommended Props: 15x12-14, 16x10-14, 16.5x10-13, 17x10-13, 18x10-12 Muffler: no CART  ADD  Price $279.99* Prices with * Include Ground Freight (48 states).

Top of page

1.60 FX Ring with Muffler

Part No. OS MG0660 Displacement: 1.60 cu in (26.2cc) Bore: 1.32 in (33.6mm) Stroke: 1.17 in (29.6mm) RPM: 1,800-10,000 Output: 3.7 hp @ 9,000 rpm Weight: 32.6 oz (925g) Recommended Props: 15x12-14, 16x10-14, 16.5x10-13, 17x10-13, 18x10-12 Muffler: yes CART  ADD  Price $299.99* Prices with * Include Ground Freight (48 states).

Top of page