POWERFIN Selections

To continue to serve your propeller needs, POWERFIN has expanded with its relocation to
El Campo, Texas - just
65-miles SW of Houston.

We are in the process of doubling (again) our manufacturing capacity!

907 S. Mechanic
El Campo, TX 77437
Ph: 979-543-7933

SELECTION GUIDE
PROPELLER RECOMMENDATION CHART

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

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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.

     TWO-STROKES

         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

     FOUR-STROKES

  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

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

ROTAX

HIRTH

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