Powerfin Inc.
Phone 1 (509) 924-7556 - Toll Free 1 (800) 581-8207 - Fax 1 (509) 924-7838
PROPELLER DIAMETER RECOMMEND
CHART
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 our 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 our 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 our 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 gearboxes run a right
turning prop.
Pushers with belt drives run a left
turning prop.
Tractors with gearboxes 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.
Click on your engine type to find a list of recommendations.
Powerfin Inc.
Phone 1 (509) 924-7556 - Toll Free 1 (800) 581-8207 - Fax 1 (509) 924-7838