O.S. Engine 61RX-H Aerobatic Nitro Helicopter Engine  [OS-17920]

O.S. Engine 61RX-H
Price:
AUD$255.82
Brand:
O.S. Engine
Model:
OS-17920
Condition:
Brand New
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Compact Power for Aerobatics - O.S. Engine 61RX-H

Pilots looking for reliable, controllable nitro thrust will appreciate the O.S. Engine 61RX-H. It combines durable construction with an engine character that supports tight manoeuvres and repeatable performance.

Precision Build Delivers Predictable Throttle

The 61RX-H is manufactured to precise tolerances so the moving parts operate in harmony, producing a smooth and usable power band. Its glow plug ignition aids fast starts and steady running, even during demanding flight sequences.

Designed with Aerobatics in Mind

This engine responds quickly to throttle input, helping pilots perform fast transitions and technical figures with confidence. Its weight and size help preserve helicopter balance, improving overall handling for serious flyers.

Real-World Comparison

In practical terms, the 61RX-H is known for a more consistent power delivery and effective fuel use compared to some rivals, making it an attractive upgrade for pilots seeking dependable performance without compromising durability.

Specifications

  • Displacement: 9.96cc
  • Bore: 23.0mm
  • Stroke: 22.0mm
  • Weight: 540g
  • Glow Plug Type: O.S. #8

For aerobatic and club pilots who demand steady nitro performance, the O.S. Engine 61RX-H offers a reliable package that balances control, durability, and serviceability.

Most standard helicopter engine mounts will accommodate the 61RX-H, but check bolt pattern and clearance for your airframe before final installation.
Monitor head and glow plug temperatures during break in and normal running. Aim for stable readings that match recommended ranges for your chosen fuel and propeller setup.
Yes, careful needle adjustments and a conservative nitro percentage will improve economy without sacrificing usable performance for most flying styles.
Use a progressive break-in routine with short runs at varying throttle, checking for even wear and stable running. Follow O.S. Engine recommendations for initial tuning and fuel.

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