FES Propeller Manual Version 1.0
February 2013
Page 6 of 9
4. Construction
4.1 Certification standards
Propeller FES-LAK-P10-100 described herein is designed and tested according to CS
22 Subpart J.
4.2 Construction Material
Propeller is made of GFC and CFC. It is made in accurate metal molds, which were
manufactured using modern CNC technology. This made possible to have very accurate
propeller geometry.
The composite propeller runs much smoother. No placards for RPM are needed
because of the high damping characteristics of the plastic.
4.3 Surface finish
Quality acrylic white paint is used to protect the composite body against moisture
and erosion. Each blade pair is sanded and polished so that mass difference is only 0,1g.
Paint is resistant against fuel, oil and other chemical products. This type of paint has also
an excellent flexibility. Tips can be painted red as a safety mark.
5. Installation
4.1 Check propeller type and condition. Clean propeller and let it dry.
4.2 Oil on any of the surfaces must be avoided. Check bolts for cracks, thread and
corrosion. Replace if needed (important that the bolts would be of the same length, so as
not to damage the motor bearings).
4.3 Assemble propeller blades with the propeller holder. Make sure that blade
marked with a small dot is inserted into propeller holder side which is also marked with
small dot.
4.4 Insert special blade holding bolts, from back side of propeller.
This means that
head of the bolt must be on trailing edge side of propeller as on picture below!
One of the bolts is
marked
on the head with a small dot. Be sure to install it into marked
side of the holder.
Before inserting bolts, grease them just slightly on the stable. Too
much grease will be removed by centrifugal force, so use really a minimum amount of
grease.
4.5 On the threaded side of a bolt put M8 Inox washer, and thread in crown nut M8.
Tighten the crown nut with 13 key so that there is some tension in holder forks, so that
bolt can not rotate. However blades must still be able to open and close freely. Then insert
into a bolt hole and trough crown nut a safety pin (with 1,4 mm diameter), cut it to proper
length and bend it around crown nut.
