Without a method of converting the power produced by the engine into useful thrust an aircraft would just be sitting still and creating a lot of noise and not get anywhere. In the past, all kinds of different propeller designs were tried: sometimes flat wooden blades, from one bladed counter weighted to multiple blade models rotating at various speeds.
Most aircraft propellers are nowadays build from a fine selection of materials like wood, metals and carbon or other fibers to form a strong construction.
FP Propeller has been producing aircraft propellers for more than 20 years, The company focusses on top performance and airworthiness for Ultralight and UAV's. Their blades are made from composite materials with a precision designed hub. In 1999 they presented at a Bassano meeting their first in-flight variable propeller for ultra light aircraft.
FP has propellers for ultra light aircraft, sea planes and UAV in variable (constant), fixed pitch and ground adjustable models. Blade pitch adjustment is done with a small servo motor and it is exclusively produced for FP and guaranteed for 6000 RPM. The motor has a TBO of more than 2000 hours in ambient conditions, maximum limited from -20 °C to +40 °C.
This hub was developed for pilots who wanted or are more accustomed to hydraulic propeller governors. The team has made sure that the piston is leak free. Control is by either a Jihostroj governor or an injection pump with electric or manual control.
FP has a large selection of propeller blades available from a range of manufacturers: Sensenich, DUC Hélices (Swirl and Flash models), Whirl Wind and Warp Drive. You can find more information about these in the menu to the left. Most are two and three blade versions in left and right hand rotation for pusher and tractor applications in varying diameters.
FP uses a in-house developed dual mode governor for the constant speed application of their propellers. The internal processor uses data from several sensors (ambient air pressure and engine RPM) for input. This gives the controller the option to operate in two modes which are described below.
In this mode the pilot selects a target RPM with the rotary knob and the controller maintains this by selecting the correct blade pitch with regard to airspeed and power setting. This is a constant RPM mode.
With this mode the controller maintains a pressure differential measured in the engine manifold and compared to the ambient air pressure. By using a built-in characteristic lookup map, specific to the engine, the controller can assure the best power / efficiency setting for the engine propeller combination in a constant power mode.
Before using the governor, you will need to select the correct engine in the setup menu.
FP Propeller can be contacted at the following addresses:
|FP Propeller - Ultra Light & UAV Propellers|
|Via Cristoforo Colombo, 37|
|44124 Ferrara (FE) Italy|
|+39 0532 732470, +39 3207 663820, +39 3482 285973|
Text and images used with permission (pending) of FP Propellers.Written by EAI.