The Fiala FM250 R5 FS is a powerful 4-stroke gasoline radial engine with a robust 250 cc displacement—perfect for large-scale models and scale aircraft. The engines are manufactured by Fiala Motors and are identical in construction to the well-known Valach engines.

With its characteristic 4-stroke sound, smooth operation, and impressive performance, the FM250 R5 delivers not only sound but also real power in the sky.

🔧 Technical Specifications:

• Type: 4-stroke gasoline radial engine (5 cylinders)
• Displacement: 250 cc
• Bore: 42 mm
• Stroke: 32 mm
• Idle speed: approx. 1,000 rpm
• Max. speed: approx. 5,000 rpm
• Ignition: Microprocessor-controlled (6–9 V)
• Recommended fuel: 2-stroke fully synthetic (1:25 or 1:33)
• Recommended fuel tank: min. 1.2 L
• Spark plug: CM6
• Propeller mounting: M5x50 screws
• Intake funnel: not recommended

⚙️ Weight (complete, incl. accessories): approx. 6,182 g

• Engine with ring muffler: 5,640 g
• Carburetor: 137 g
• Ignition: 180 g
• Fuel pump: 115 g
• Drive shaft: 110 g

⚡ Package contents:

• Fiala 4-stroke gasoline radial engine (250 cc)
• Microprocessor-controlled ignition
• Fuel pump
• Spark plugs
• Propeller mount
• Tool set

🌀 Recommended propeller sizes:

2-blade (Fiala):

• 32×16
• 34×16
• 34×18

3-blade (Fiala):

• 30×16

💡 Special features:

• High-quality craftsmanship – “Made in Europe”
• Breathtaking 4-stroke sound
• Smooth running & easy setup
• Ideal for large-scale models & aerobatic aircraft
• Compatible with Fiala & Valach accessories

The Fiala FM250 R5 FS combines power, sound, and quality in a single engine – for model pilots who want to get the most out of their large-scale models.