The Porcelli in flight variable pitch propeller, allows you to automatically exploit the full power of your engine. By installing an inflight Variable Pitch Propeller is like having a number of different propellers, each one of them best suited to a particular flight phase such as takeoff, climb, cruise, descend, dive or land.
Installing an Inflight Variable Pitch Propeller you will get the maximum possible thrust from your engine, hence, your take-off run will be the shortest possible ever.
Again your Inflight Variable Pitch Propeller will give you the best possible climbing rate.
Your Inflight Variable Pitch Propeller will increase the efficiency of your engine-propeller assembly. So you get the same mileage with less fuel and at a faster speed.
Your Inflight Variable Pitch Propeller will optimize your top speed pushing your aircraft to the maximum speed achievable with your engine power.
The efficiency of a propeller is defined as the ratio between the used power (speed x traction) and the power supplied by the engine.
The efficiency obtained with a good propeller is at most 85%, that is, with an engine of 100 Hp you get 85 Hp of used power whereas 15 Hp are wasted, but this is only true when travelling at V0 (optimum speed).
Travelling at any different speed you will get a lower efficiency.
This is because the propeller blades provide their maximum thrust when positioned to an angle of incidence between 2 and 3 degrees; in a fixed pitch propeller this condition occurs only at Vo.
A propeller that can change its pitch angle as the plane flies achieves the maximum efficiency at any flight condition. In fact it keeps its angle of incidence constantly at about 2 ° -3 °. This way, Vo is no longer one single speed, but a range of speeds, as shown by the red curve. We can say that a variable pitch propeller on an aircraft has a similar function of a car gear box.
Elvio Porcelli
The Porcelli propellers stems from the desire of Elvio Porcelli. Son of art, working in the field of precision mechanics for over 60 years!
Read MoreElvio Porcelli
Company Owner
has been infected with the passion of flying from his early age in 1979, he produced an aircraft designed by the engineer Marino Touts based on Rogallo’s wing, called "Leonardino."
With his Leonardino Elvio became one of the pioneers of light aviation in New York, opening the way to future ultra-light as we know them today.
In 1980 he obtained a PPL license in Rome. Between 1985 and 1994 Elvio flew an aircraft he designed and built in his own workshop, the result of experiments or further training.
In 1995 he built, with his friend Franco Tombolillo, an aircraft derived from the famous Storm, and it was in that period that he began to think of adjustable pitch propellers.
The market did not offer much about such propellers for ULM. So, why not build one? The first prototype of a variable pitch propeller, a two-blade electrically operated one was first developed.
The novelty aroused curiosity and enthusiasm among friends and colleagues, and so the propeller was given to some of the most experienced pilots including Franco Martone, Carlos Grisogoni , Angelo Pastore. The military pilots of good experience had the precise task to stress the propeller in order to bring out any eventual issues.
After more than five years of tests all the pilots gave their blessing to the new propeller.
During all these many years, Elvio has been improving his propellers thus arriving to the product as we see it today.
His ultimate product being the hydraulic version, an absolute novelty in the field ultralight.
Elvio Porcelli Propellers
Via della Libertà, 36
04014 Pontinia (LT)
Phone: +39 347 0731535
info@porcelli-propellers.it
Airfield support
Avio Club Pontina
Stada del frassonetto 4955
04014 Pontinia
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