Model B

General use propeller, although specifically designed to run significantly smaller diameters than most other props. The B-Model runs very well on a 582/2.58 as a three blade 60" for example, and can out produce the competition even when running much smaller diameters. Maximum possible diameter with this model is 65".

Model C

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 is the propeller being sold as standard equipment on 6 of the top 7 ppc's. Maximum possible diameter with this model is 69".

Model E

This is Powerfin's smallest propeller - designed for engines between 15 and 30 horsepower. These narrow blades allow for a maximum possible diameter of 53". 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.

Model F

This is Powerfin's largest propeller - designed for larger two-stroke engines that use the higher gear reduction ratios and horsepower up to 115. This prop runs beautifully on a Rotax 503/3.47 as a three blade 66"-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. Maximum possible diameter with this model is 75".

Read The Key

To understand the information below please note that "2-56/3-52" means you can choose a 2 blade 56" or a 3 blade 52".

Something Else To Note

These recommendations are for the largest possible prop that is aerodynamically suitable for the engine and re-drive combination listed. The largest possible choice will generally give you the best performance in the static and climb mode of operation. Most ultralights fit into this category. If you have an airplane that goes faster than the average ultralight, you might want to run a smaller diameter than this list recommends. It would be best to call us if you have the slightest question about this.

Which Direction?

Direction of rotation is always noted from the rear of the vehicle. If you are standing behind the airplane and getting blown by the prop wash, which direction is it turning? Counter-clockwise is left and clockwise is right. The following is a fail safe list to follow for rotation direction.

For all TWO-STROKE engines normally used with ultralights:

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 Rotax 912, 912S, and 914 turn opposite the two-stokes and only have gear boxes available to them:

Pushers run a left turning prop.

Tractors run a right turning prop.

ROTAX 277 - 26 HORSEPOWER - 6250 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2	3125					3-42
2.24	2970		2-52			3-47
2.58	2422		2-56/3-52			3-51

ROTAX 377 - 35 HORSEPOWER - 6500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2	3250		2-52			3-45
2.24	2901		2-56			3-50
2.58	2519		2-60/3-55	2-62/3-55

ROTAX 447 - 40 HORSEPOWER - 6500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2	3250		2-56			3-48
2.24	2901		2-59			3-51
2.58/62	2500		2-61/3-57	2-64/3-58
3	2166		2-65/3-61
3.47	1873		3-64				2-68
4	1625						2-71/3-66

ROTAX 503 SC - 46 HORSEPOWER - 6250 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2	3125
2.24	2970
2.58/62	2405		2-63/3-59	3-59
3	2083		3-64/4-60				2-67
3.47	1801		4-63/5-60				2-72/3-68
4	1562						3-72

ROTAX 503 DC - 52 HORSEPOWER - 6500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2	3250
2.24	2901
2.58/62	2500		2-65/3-60	3-60			2-66
3	2166		3-65/4-62				2-68
3.47	1873		4-65/5-63				3-70/4-67
4	1625						4-70/5-66

ROTAX 582 - 65 HORSEPOWER - 6500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2	3250
2.24	2901
2.58/62	2500		3-64	3-64			2-70/3-64
3	2166		4-62/5-60				2-74/3-68
3.47	1873		4-65/5-63				3-72/4-69/5-66
4	1625		5-65				4-72/5-69

ROTAX 618 - 75 HORSEPOWER - 6500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2	3250
2.24	2901
2.58/62	2500		3-65	3-66/4-62			2-72/3-67
3	2166						2-74/3-70
3.47	1873						3-74
4	1625

ROTAX 912 - 80 HORSEPOWER - 5800 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2.27	2555		3-65/4-65	4-64			2-72/3-70/4-66

ROTAX 914/912S - 100 HORSEPOWER - 5800 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2.43	2386		5/65	5-64			2-74/3-72/4-69

HIRTH F23 - 40 HORSEPOWER - 5500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
1.8 BLT	2555		2-60	3-57
2.2 BLT	2500		2-60	3-58
2.5 BLT	2200		2-63
2.16 G	2546		2-60
2.29 G	2401		2-61	3-58
2.59 G	2123		2-63
3.16 G	1740		3-62				2-68
3.65 G	1506		3-65				2-74/3-67

HIRTH F33 - 25 HORSEPOWER - 6000 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
1.8 BLT	3333					3-40
2.2 BLT	2727					3-44
2.5 BLT	2400		2-54			3-48

HIRTH F36 - 15 HORSEPOWER - 6000 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
1.8 BLT	3333					3-38
2.2 BLT	2727					3-42
2.5 BLT	2400					3-46

HIRTH 2702 - 40 HORSEPOWER - 5500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2.16 G	2546
2.29 G	2401		2-62
2.59 G	2123		2-64/3-58
3.16 G	1740		3-62				2-68/3-62
3.65 G	1506		3-65				2-70/3-66

HIRTH 2703 - 55 HORSEPOWER - 6200 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2.16 G	2870		2-58
2.29 G	2707		2-60
2.59 G	2393		2-63/3-60	3-61
3.16 G	1962		3-65				2-70/3-68
3.65 G	1698						3-72

HIRTH 2704 - 53 HORSEPOWER - 5500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2.16 G	2314		2-65/3-61	3-65			2-67/3-62
2.29 G	2183		3-65				2-70/3-65
2.59 G	1930		3-65				2-74/3-68
3.16 G	1582						3-74
3.65 G	1369

HIRTH 2706 & 3203 - 65 HORSEPOWER - 6200 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2.16 G	2870		2-63/3-58
2.29 G	2707		2-65/3-61				2-66
2.59 G	2393		3-64	3-64			2-70/3-65
3.16 G	1962						2-74/3-70
3.65 G	1698						3-74

HIRTH F30 - 80 HORSEPOWER - 5500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2.03 G	2709		3-64				2-68/3-63
2.25 G	2444		3-65				2-72/3-68
2.60 G	2115						3-72
2.96 G	1858						3-74

HIRTH F30 - 85 HORSEPOWER - 5500 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2.03 G	2709		3-65				2-69/3-64
2.25 G	2444						2-73/3-68
2.60 G	2115						3-73
2.96 G	1858						3-75

HIRTH F30 - 110 HORSEPOWER - 6200 MAX RPM

RATIO	PROP RPM	A	B	C	D	E	F
2.03 G	3054						3-65
2.25 G	2855						3-68
2.60 G	2384						3-74
2.96 G	2094

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