Polini Thor 250 to znany szerokiej rzeszy pilotów silnik. Wykorzystywany przede wszystkim do trajek jedno- i dwuosobowych, a także do lotów na małych, wymagających mocy skrzydłach.

Polini Engine 2 stroke monocylinder
Cooling Liquid cooled
Bore for stroke 72 x 60
Displacement 244 cm3
Power 36 HP at 7500 R.P.M.
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
Air filter Air box
Ignition Electronic and 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
Starting (Electric starter optional) Pull start with self winding cable FLASH STARTER
Clutch Centrifugal in oil bath
Muffler Expansion with oval silencer
Engine weight 18 Kg (19kg with electric starter) without radiator
Propeller rotation Clockwise