FES Propeller Manual Version 1.11
November 2016
Page 8 of 10
6. Place M8 Inox washer to the threaded side of a bolt, and then a crown nut M8. Tighten
the crown nut with key number 13, so that there is some tension in holder forks, which
created enough friction so that bolt can not rotate freely. If there is too much tension in
the forks, propeller blades would not be able to open and close freely. If this is the case,
un-tight crown not so that blades can move free, and it is also possible to insert split pin
into the hole in the pin trough crown nut. Carefully insert new safety pin of
1,4mm diameter x 22mm length, and bend its two ends, around crown nut.
7. Fix the spinner with six Inox bolts with countersink head M4x8mm. Just tight them
gently with small torque (do not use high torque, as thread in the aluminum plate could
be damaged). Please do not use any glue to secure fixing bolts, as during rotation
centrifugal force to the bolts creates high enough friction, which prevent them, from
unscrewing. We prefare to cover heads of the bolts with thin white round stickers, which
additionally secure the bolts from unscrewing, and it also looks nicer!
6. Removal
Follow the steps like in previous chapter, from 1 to 7, just in reverse order.
7. Inspection
1. Before first flight in a day, perform short
daily inspection
of each propeller blade:
a)
Clean the propeller with any car wash solution or equivalent.
b)
Check leading and trailing edge at the root, for any visible cracks, or other damages
from small stones etc.
c)
Check that each blade is moving forward and backward freely with only small
friction.
If there is no sign of cracks/deformations on the surface, you can assume the blades are
fit to fly. Small damages of paint due to small stones are unavoidable after long usage.
If there are visible cracks or damages, contact the manufacturer for advice before usage.
Before each flight
perform preflight check including points b) and c) of daily inspection.
