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OS 1.40 RX - FI

It's the engine with a Brain. A built-in computer sets this engine apart from the competition.

It's the absolute ultimate in sophistication for an R/C airplane engine — shattering all pre-conceived notions about just how high-tech an engine can get! The 1.40 RX-FI from O.S. utilizes advanced electronics to constantly monitor engine rpm, calculate the fuel required at any given moment for maximum performance, and then deliver that exact amount of fuel to the engine. The result? The smoothest-running, most consistently powerful 2-stroke engine imaginable, and a natural choice for FAI F3A competitors, or any modeler who wants to equip their plane with state-of-the-art engine technology.

Here's how the 1.40 RX-FI works:

Two sensors constantly supply vital information about the engine's changing conditions to the EC-1 Electronic Control Unit. Based on this data, the EC-1 commands the injector to supply the optimum quantity of fuel to the engine at all times.

The 1.40 RX-FI rates extremely high in all of these areas:

  • CONSISTENCY: The Electronic Fuel Injection system constantly supplies the correct fuel/air mix to the engine, regardless of speed, altitude or attitude.
  • THROTTLE RESPONSE: Very little trim is needed to set up the engine perfectly; even at low speeds, the idle is reliable, so you can concentrate on flying.
  • STABILITY: Once adjustments are made, the 1.40 RX-FI engine holds them very well.
  • POWER: The 1.40 RX-FI creates the kind of “pulling power” that pattern fliers need for maneuvers that demand steep climbs, and it works with 15% nitro fuel.
  • MAINTENANCE: With fewer moving parts (no valves, camshaft, etc.), the 1.40 RX-FI is easier and cheaper to set up and maintain than a 4-stroke.
  • OTHER FEATURES: The 1.40 RX-FI also boasts the advantages of lower noise output than a 4-stroke, excellent fuel consumption and minimal vibration levels.
The display panel normally shows engine rpm, but it also has a memory function for recording the highest rpm and engine temperature during each flight.

RPM Sensor

Monitors rotational speed of the crankpin, and feeds this information back to the control unit.

Temperature Sensor

Monitors engine temperature during starting as well as in flight, and also calculates supplementary fuel release that may be necessary when starting.


Releases fuel through a solenoid-operated valve controlled by the EC-1 unit. Fuel pressure is generated within the crankcase and is automatically regulated.

Displacement 1.404 (23 cc)
Bore 1.269 in (32 mm)
Stroke 1.126 in (28.6 mm)
RPM 1800 - 10000


3.5 BHP @ 9000 RPM
Weight 28.5 oz (807 g)
Recommended Props n/a
Price R Not Available