705 South 5300 West
Unit #4 - 5
Hurricane, UT 84737


made in America




Model "B" blade
The 'B' model is a general use propeller blade, although specifically designed to run on significantly smaller diameters than most other props. The Model-B runs very well on a 582/2.58 as a three blade 60" for example, and can out-produce our competition even when running much smaller diameters.

Diameter Range: Minimum: 48" <> Maximum 65"
Speed Range: 22 - 95 knots / 25 - 110 mph
Model "C" blade
The 'C' model is designed specifically for powered parachutes as a three blade 64" on a Rotax 582/2.58. This design works well on Rotax 447's through Rotax 618 as well as the Hirth engines that fall between 40 and 80 horsepower. This has been the propeller being sold as standard equipment on 6 of the top 7 PPC's.

DDiameter Range: Minimum: 48" <> Maximum 65"
Speed Range: upto 31-knots / 35-mph
Model "E" blade
The 'E' model is our smallest, narrowest propeller blade - designed for engines between 15 and 30 horsepower. Backpack & PPC's are the target of this design although the blade has been proven very efficient on many older, fixed wing airplanes with diameter restrictions. This is the ONLY pitch adjustable prop available to backpack units.

Diameter Range: Minimum: 39" <> Maximum 53"
Speed Range: 20 - 70 knots / 22 - 80 mph
Model "F" blade
The 'F' model is our largest propeller - designed for larger two-stroke engines that use the higher gear reduction ratios and horsepower up to 115. This prop blade runs beautifully on a Rotax 503/3.47 as a three blade 66" to 70". A two place Kolb can't squeeze any more efficiency out of a 503/3.47 than with our F-model 68" prop. This prop is also the finest prop available for the Rotax 912, 912S, and 914 engines.

Diameter Range: Minimum: 48" <> Maximum 75""
Speed Range: 22 - 95 knots / 25 - 110 mph


2, 3, 4, & 5-Blade Apex Series Hubs
Standard 2 Balde Hub
Standard 3 blade Hub
Standard 5 Blade Hub
Standard 2 Blade Hub
Standard 3 Blade Hub
Standard 5 Blade Hub
Large 3 Blade Hub Large 4 blade hub Large 5 blade hub
Large 3 Blade Hub
Large 4 Blade Hub
Large 5 Blade Hub
Special E Hub
Special E Blade Hub

The new Apex series, fully ground adjustable hubs are the finest crafted hubs available to the ultralight and experimental market. Made in-house on our new Haas VF4 CNC vertical milling station, these hubs offer features that are unavailable on other hubs. By nature of the fact that we own the machine, we can take the time to pack features into these hubs that we couldn’t afford to buy from an outside vendor. They are highly sculpted solid 6061-T6 aluminum and are made to the finest CNC machining tolerances in the industry. In fact, we specifically designed the machining process to insure a perfectly balanced prop hub. The hubs are anodized to a luxurious black finish you will be proud to display. It takes longer to make Apex hubs, it’s true, but there is no comparison between these hubs and any other offered by our competition.

The multi-blade configurations offered with the new Apex hubs allow us to take advantage of the large reduction ratios offered by Rotax and Hirth in their gearboxes. Also, more horsepower can be loaded into more blades so this may be a solution to some applications that have limited room to turn a propeller.

Something Else To Note
These recommendations are for the largest possible propeller blade that is aerodynamically suitable for the engine and reduction gearbox combinations listed.

*The LARGEST possible choice will generally give you the best performance in the static and climb mode of operation.* Most Ultralight/LSA class aircraft fit into this category.

If you have an airplane (fix-wing) that goes faster than the average Ultralight, you might want to run a smaller diameter than this list recommends. It would be best to contact us (Email us) if you have the slightest question about this.

Which Direction? The direction of spin...
Direction of rotation is always noted from the REAR of the vehicle. If you are standing behind the aircraft and getting blown by the prop wash, which direction is it turning?

         Counter-clockwise is a LEFT turning prop and a clockwise is a RIGHT turning prop.

The following is a fail safe list to follow for rotation direction.


         For all TWO-STROKE engines normally used with Ultralight/LSA:
                - PUSHERS with GEAR-boxes run a RIGHT turning prop
                - PUSHERS with BELT-drives run a LEFT turning prop
                - TRACTORS with GEAR-boxes run a LEFT turning prop
                - TRACTORS with BELT-drives run a RIGHT turning prop


  The FOUR-STROKE engines (912, 912S & 914) turn opposite the two-stokes and are only available with GEAR-boxes...
                - PUSHERS run a LEFT turning prop
                - TRACTORS run a RIGHT turning prop

Click on your engine type to find a list of recommendations.

    POWERFIN Propellers manufactures Light Sport propeller applications which include UAV, LSA, Ultralight, and Experimental propellers as well as wind energy generating blades.

POWERFIN is dedicated to combining the best of good-ole-American-fashion integrity and innovation with advanced composite technologies.
© 2011 POWERFIN, all rights reserved.