# Miniplane Polini

- Link: https://paraglidingequipment.com/miniplane-polini/
- Published: 2016-10-27T20:54:32-06:00
- Author: admin

## Miniplane Polini

After 40 years producing engines for scooters and minibikes, Italian company Polini
have turned their sights to paramotoring and with that they created the Miniplane
Polini.

The fruit of their labors is the Thor motor: A 130 cc 2-stroke engine, it was designed
to be as compact and lightweight as possible, with a great power-to-weight ratio
and “best and constant performance at every RPM”.

Polini Racing Motori, a famous Italian manufacturer of racing engines, enters the
Powered Paragliding market in 2010 with the Polini Thor 100. This Miniplane Polini
engine features advanced technical solutions. It was projected to achieve the best
weight-power ratio but, at the same time, to optimize the thermal and moving parts
functions. The cooling system was studied with great care and Polini opted for the
forced air. The transmission group includes the clutch in oil bath with maximum 
stability.

The unceasing research, the constant development, together with the experience acquired
during the races, set up THOR, the new 2 stroke paramotor engine proper for the 
Powered Paragliding. The project was born from the studies and the planning skills
of the R&D’s technicians who were able to find out the possibility to manufacture
a compact and light 2 stroke engine. Afterward, the developments and the perfect
set up were possible thanks to the testing technologies and to the test benches 
available at Polini together with the know-how acquired during many years of experience
in the racing world.

  ⌊paramotor_polini_testing⌉ paramotor_polini_testing

At the end of the assembly line, the engine is always tested on the test bench at
the fly conditions with the propeller mounted: they calibrate the carburation and
after a running-in cycle Polini measures the maximum thrust value provided by the
propeller. The thrust value must respect a short tolerance range to pass the final
inspection and it must be able to grant a high-performance constancy between all
the engines produced. Mini plane

  ⌊paramotor_polini_4⌉ paramotor_polini-runing-test

This test bench was developed expressly for this engine. Through a charged cell 
with digital visualizer together with a digital revolution indicator, we can measure
the thrust at every rpm. In this way, Polini can test different propellers to achieve
the best thrust and the most performing propeller.

Miniplane Polini Thor Specifications:

• Engine 2 stroke monocylinder
 • Cooling – Forced air • Bore for stroke -52 x 52•
Displacement -110 cm3 • Power -20.5 HP a 8900 R.P.M. • Static thrust with the 130cm
prop – 64 Kg. • Cylinder – Aluminum with Gilnisil coating • Compression ratio 12.5:
1 • Piston – Two chromium plated rings mm 1 Mini plane • Intake – Reed vale in the
crankcase • Carburetor -Walbro • Air filter -Air box • Spark plug hood – 5k Ω resistance•
Fuel type – Lead free petrol with 2% synthetic oil • Gear reduction unit – Helical
teeth in oil bath with 3,43 reduction ratio • Starting – Pull start with self winding
cable • Clutch – Centrifugal in oil bath • Muffler – Expansion with oval silencer•
Fuel Consumption – 2.7/3 litres/hour at 6500 rpm – 30kg thrust • Engine weight -
11.8 Kg. • Propeller rotation – Clockwise