Engine Type | 2-stroke, single-cylinder |
Displacement | 193 cc |
Bore x Stroke | 2.52" × 2.36" (64 mm × 60 mm) |
Max Power Output | 29 HP @ 8,100 RPM |
Max Static Thrust | 183 lbs with 51" propeller |
Fuel Consumption | ~0.71 gal/hr (2.7 L/hr) |
Cooling | Forced air with HF and Spark Cooling Systems |
Starter | Manual Flash Starter (Electric optional) |
Gear Reduction | Belt drive, 2.83:1 ratio |
Carburetor | Walbro WB37 |
Air Filter | Air box with tuned inlet |
Ignition | Inductive electronic |
Clutch | Optional dry centrifugal clutch |
Prop Rotation | Counterclockwise |
Fuel Type | Unleaded 95 octane (E5) or 100LL AVGAS with 2.5% synthetic oil |
Weight Range | 30–37.5 lbs (13.6–17 kg) |
Mounting | Compatible with Thor 80, 130 EVO, 200 HF, 250 |
Made In | 100% Italy |
🔥 HF Cooling System – Advanced Heat Management
The HF Cooling Shroud is redesigned for maximum airflow, improving heat dissipation and airflow to the cylinder and propeller. Paired with Polini’s Spark Cooling System (SCS), this reduces Exhaust Gas Temperatures (EGT) by up to 212°F (100°C) and lowers plug-area temps by up to 122°F (50°C), protecting the engine under prolonged load.
🧠 Cylinder Head & Combustion
High-compression combustion chamber for optimized flame propagation
Gilnisil-coated aluminum cylinder with nickel-chrome liner
Gravity-cast, high-silicon alloy piston with dual 1 mm chrome/nitride steel rings
Delivers strong performance with low friction and long wear life
⚙️ Belt Drive Transmission
2.83:1 gear ratio via belt transmission
Custom tension-bearing supports lateral loads 10x greater than standard
Special belt compound for reduced maintenance and improved grip
Engineered crankshaft reduces vibration and wear
🔩 Crankshaft & Bearings
Precisely balanced rotating weights
High-grade steel with thermal treatment
Top-tier bearings rated for heavy transverse loads
Designed to minimize unbalanced mass and vibration during flight
🔊 Exhaust System
Hand-built, dual-section expansion exhaust
Compact, aerodynamic, and vibration-resistant
Mounted with spherical joints and rubber dampers for extended lifespan
Optional lightweight titanium version available
🥤 Fuel System & Carburetion
Tuned Walbro WB37 carburetor for consistent power at 8,100 RPM
Dedicated airbox with noise-dampening inlet holes
Optimized atomization for smooth throttle response and efficient combustion
🧩 Compatibility & Mounting
The Thor 190 HF uses the standard Polini Thor mounting pattern, shared with models like the Thor 80, 130 EVO, 200 HF, and 250. This ensures:
Drop-in replacement compatibility
Faster installation
Easier upgrades or maintenance
Lower frame development costs for manufacturers
⚡ Starter Options
Manual Flash Starter (standard) – durable carbon steel build, ergonomic grip
Electric Starter (optional) – includes battery, relays, and 12V output
Centrifugal Clutch (optional) – improves ground safety and idle handling