PRODUCT INFORMATION
Polini THOR 250 engine features a liquid cooling system, that grants an extraordinary steady power output and better performance at every rpm.
Thor 250 engine is small and very compact with a great power/weigh ratio.
The die cast light-alloy aluminium cylinder grants a better thermal stability. The liner with Nickel-Siliceous coating improves the piston sliding, its resistance to wear and abrasion. The piston, gravity cast at high silicon content light alloy, reduces thermal expansion and the coupling slack. The piston top design is specific to optimize the compression ratio. The advanced technology and the great performance of the new THOR 250 gives a better feeling when driving making the flight even more performing, dynamic, reactive, beside granting more stability.
TECHNICAL FEATURES
Polini engine- 2 stroke monocylinder
Cooling- Liquid Cooled
Bore for stroke-72 x 60
Displacement- 244 cm3
Power- 36 HP
R.P.M.- 8,000
Cylinder- Aluminum with Gilnisil coating
Compression ratio- 11,5:1
Piston- Two chromium plated rings mm 1
Intake- Reed valve in the crankcase
Carburetor- Ø28 Bowl
Air filter- Air box
Ignition- Electronic with battery charger possible
Battery charger prearrangement-Output power 80 W at 5500 RPM
Spark plug hood- 5k Ω resistance
Fuel type- Lead free petrol with 2% synthetic oil
Gear reduction unit- Helical teeth in oil bath with 2,8 reduction ratio
Starter- Pull start with self winding cable Flash Starter – Electric starter (optional)
Clutch- Centrifugal in oil bath
Muffler- Expansion with oval silencer
Engine weight- 18 Kg (19kg with electric starter) without radiator.
Propeller rotation- Clockwise
THOR 250 DUAL SPARK
PRODUCT INFORMATION
Polini THOR 250 DUAL SPARK engine features 2 spark plugs and 2 independent ignitions to grant the maximum safety standard in every condition of flight. The liquid cooling system grants an extraordinary steady power output and better performance at every rpm.
Many are the advanced technical solutions adopted.
- The die cast light-alloy aluminium cylinder grants a better thermal stability.
- The piston, gravity cast at high silicon content light alloy, reduces thermal expansion and the coupling slack. The piston top design is specific to optimize the compression ratio.
- It is provided with a balancing countershaft; this feature cancels the vibrations and guarantees such a comfort when driving never felt during a flight and a better engine lasting. The counter revolving rollers considerably decrease the upsetting torque-steer for a further flight comfort.
TECHNICAL FEATURES
Polini engine- 2 stroke monocylinder
Cooling- Liquid Cooled
Bore for stroke-72 x 60
Displacement- 244 cm3
Power- 36 HP
R.P.M.- 8,000
Cylinder- Aluminum with Gilnisil coating
Compression ratio- 11,5:1
Piston- Two chromium plated rings mm 1
Intake- Reed valve in the crankcase
Carburetor- Ø28 Bowl
Air filter- Air box
Ignition 1- Electronic
Ignition 2- Electronic battery powered
Battery charger – Output power 80 W at 5500 RPM
Spark plug hood- 5k Ω resistance
Fuel type- Lead free petrol with 2% synthetic oil
Gear reduction unit- Helical teeth in oil bath with 2,8 reduction ratio
Starter- Electric starter + pull start with self winding rope Flash Starter
Clutch- Centrifugal in oil bath
Muffler- Expansion with oval silencer
Engine weight- 18,5 Kg (19,5 kg with electric starter) without radiator.
Propeller rotation- Clockwise
