Polini launched the new Thor 303 that will replace the Thor 250.

An innovative engine with important novelties that result into reliability, power. Reduced weights, reduced aerodynamic section and moderated depth.

This is the engine of the Thor family with the biggest displacement with cylinder, crankshaft, carburetor, air box, CDI and exhaust system completely redesigned to grant better performance and flight safety. With 38hp at 8000 rpm, Thor 303 offers 120 kg of static thrust with a propeller of 160cm* The consumption is only of 3 liters per hour at 4500 rpm, that corresponds to 30 kg of static thrust, medium range at level flight.

Thor 303 is available in 3 versions:

• Thor 303 with Manual “Flash starter”
• Thor 303 with electric starter+ Manual “Flash starter”
• Thor 303 Dual Spark

Considering the power of the Thor 303 engine, it finds its highest expression when installed install it on single or be-place trike, delta trike, 3-axle or U.A.V (unnamed aerial vehicle). The installation on single-seat paramotor is recommend to expert pilots only and for slalom competitions.

Polini Engine	2 stroke monocylinder
Cooling	Liquid cooled
Bore for stroke	76 x 62
Displacement	281 cm3
Power	38 HP at 8000 rpm
*Max trust	120 Kg with Ø 160 cm propeller
R.P.M. max	8.400
Cylinder	Aluminum with Gilnisil coating
Compression ratio	11,2:1
Piston	Two trapezoidal chromium plated rings
Intake	Reed valve in the crankcase
Carburetor	Dell’Orto VHST 28mm
Air filter	Air box
Ignition	Electronic CDI with adj. advance
Battery charger prearrangement	Output power 40 W at 5500 RPM
Spark plug hood	5k Ω resistance
**Fuel type	E5 petrol or LL AV GAS-al with 2,5% synthetic oil 100%
*Consumption	3 Lh 30 Kg a of static trust
Gear reduction unit	Helicoidal teeth in oil bath with 2,8 or 3,2 reduction ratio
Starter	Flash Starter – (Electric starter -optional)
Clutch	Centrifugal in oil bath
Muffler	Expansion with aluminum silencer
Engine weight	Starting from Kg 20,5 (manual starter model +radiator)
Propeller rotation	Clockwise