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 counterweighted 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.
GT-Propeller (founded 1969) was the first domestic corporation to manufacture all the propellers for the new Rotax motor imported in Italy for the TECNAM aircraft company. They have build thousands of propellers for this succesful aircraft company and are qualified to perform maintenance on the Sensenich series of composite propellers too.
GT propeller is located in Riccione, a couple of miles south of Rimini. They are very flexible and so can satisfy most of their customers requirements and produce a vast range of propellers starting from one for a single seat homebuilt VW auto conversion to a five blade propeller for a full size warbird aircraft producing over 2000 hp.
They have been in business for over 45 years, are the only Italian EASA certified company with over 30000 propellers produced. The product line encompasses over 200 models and types from fixed pitch to fully electrical or hydraulic constant speed controllable models.
Manufactured from a combination of high quality selected woods such as maple, ash, birch and mahogany. The variable pitch propellers are made from beech wood which is specially produced for aviation applications and has a tensile strength similar to metal. The individual layers are then press glued together to form a rigid block using certified high performance aircraft glues. Continuous testing throughout the production stages ensure the highest possible quality.
The blades are laminated with a composite material to improve surface protection and ensure better blade stability for many years to come. The high resistance leading edge protection is applied by injecting a special two component epoxy resin. This leading edge guard is very resistant to impact from small stones, rain and other debris.
GT Propellers manufacture and sell fixed and variable pitch and ground adjustable propellers, they are available with two up to five blade configuration and are electrically or hydraulically operated for pusher or tractor operation.
GT Propeller hubs are manufactured of high-grade aerospace aluminum alloy, which guarantees high strength. For special applications some hub models are made of steel. All internal parts of both alloy and steel hubs are plated internally and externally are painted for corrosion protection.
For the hydraulic controlled propellers the axial movement of the piston is transferred to the pitch change knob by a fork and pitch change blocks, thus varying the blade angle. Mechanical stops limit the pitch range. The optimum blade angle can be adjusted once the propeller is installed on the aircraft.
An electric motor is installed in the hub and specially engineered to change the pitch. Several electronic governors are available. Normally these electrical propeller hubs are installed only on engines that cannot accept a hydraulic governor or by preference of the aircraft owner.
To finish off your propeller installation, GT Propellers also sell a matching spinner and backplate made from composite materials. Some applications may receive a Kevlar model others are made from aluminum in various diameters. They all can be painted to suit your aircraft.
GT Propellers can be contacted at the following addresses:
|GT Propellers - Italian Wood Composite Propellers|
|Via del Commercio, 7|
|47838 Riccione (RN) Italy|
|+39 0541 693399|
Text and images used with permission (pending) of GT Propellers.