Mastering Power: The O.S. Engine 91FX for Large-Scale Aircraft
For RC aviation enthusiasts seeking a balance between power and practicality, the O.S. Engine 91FX stands as an exemplary choice. This robust glow engine is designed to meet the demands of large-scale model aircraft, providing a seamless blend of power and user-friendly features. With its impressive 2.8 horsepower output, the 91FX is engineered to excel in performance, making it a standout in its category.
Why Choose the O.S. Engine 91FX?
The O.S. Engine 91FX is crafted to fill the niche between .60-size glow engines and larger gas engines. This strategic positioning allows hobbyists to enjoy the convenience of glow technology while accessing the power required for larger models. The engine's design incorporates meticulous testing and innovation, ensuring reliability and efficiency over extended periods of use.
Innovative Design Features
One of the key highlights of the 91FX is its advanced needle valve system, featuring coarse threads and an O-ring seal to minimize settings drift due to vibrations and air leaks. This ensures that pilots spend more time flying and less time adjusting. Additionally, the engine boasts an extra-long crankshaft with a locknut assembly, enhancing safety and propeller engagement.
The semi-squared head design, along with an optimized crankcase profile, improves cooling capacity, which is crucial for maintaining peak performance during flights. The dual bearing design, with a larger front bearing, adds to the engine's durability and smooth operation, making it a reliable powerhouse for any large-scale aircraft.
Specifications
- Displacement: 0.912 cu in (15.0 cc)
- Bore: 1.091 in (27.7 mm)
- Stroke: 0.976 in (24.8 mm)
- Practical RPM Range: 2,000-16,000
- Output: 2.8 hp @ 15,000 rpm
- Weight: 19.3 oz (550 g)
- Includes: Muffler, Safety Propeller Locknut Assembly, #8 Glow Plug
- Recommended Props: 13x8, 13x9
The O.S. Engine 91FX is ideal for those who demand reliability and performance in their large-scale RC aircraft. Its thoughtful design and robust power output make it suitable for both seasoned hobbyists and those looking to upgrade from smaller engines.
