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.
Variable pitch propellers have a distinct advantage compared to fixed pitch models. This translates into a more fuel efficient, higher performing aircraft with much improved rate of climb and shorter takeoffs for those tight places!
The PowerMax propeller is marketed by TL-Ultralight from the Czech Republic (EU) and used on standard Rotax engines up to 115 hp.
TL-Ultralight was established in 1989, and is currently among the leading manufacturers of UL and LSA aircraft. Aircraft carrying the TL-Ultralight brand are being used all over the world. Every single model is individually engineered and is given delicate attention during the entire manufacturing process and subsequent test flights. The company maintains strict quality control processes combined with good old craftsmanship to produce exceptionally flying aircraft.
The PowerMax is a three-blade tractor in flight adjustable aircraft propeller (constant speed). The aluminum alloy hub consists of top and bottom flanges. The blade adjustment mechanisms are located inside the hub. An actuator inside the hub increases the blade angle. To move in the opposite direction, the blades are adjusted through the force of a spring located also in the hub.
The carbon fiber blade root is made of steel and is mounted onto the hub by a pair of axial bearings. The electric actuator is located outside the hub, above the engine gearbox under the cowling, and controls the blade adjustment though the hollow axis of the reduction unit and the propeller.
Blades are made from carbon fiber, hub and pitch control units from the highest super durable aluminum alloys. The tensile strength of the blades are confirmed to be over 10.000 kg. The actuator is guaranteed to handle hundreds of thousands operational cycles.
The blades are predominantly white with some accent colors at the tips. There are several colors available to match your aircraft. The diameter of the propeller is 1748 mm and it has a pitch range of 10°, min/max pitch speed under load is 4,6 s. The weight of the blades with hub is 10 kg. Propeller rotation is standard clockwise as seen from the cockpit, which is normal with Rotax engines. Maximum rotational speed is 2387
TL-Ultralight recommends that this propeller be used on Rotax 912 (80hp), 912S and iS Sport (both 100 hp) and the turbocharged Rotax 914 (115hp), there is no mention if this propeller can be used on the latest Rotax 915iS (141hp) engine. I am guessing that some strengthening needs to be done to handle the higher power output of the 915iS.
For the web catalog about the PowerMax propeller see the next link: PowerMax catalog.
TL-Ultralight can be contacted at the following addresses:
|Letiště 515, Pouchov|
|503 41 Hradec Králové, Czech Republic|
|+42 0495 211 753|
Text and images used with permission (pending) of TL-Ultralight.Written by EAI.